/MIN   Per minute, usually RPM, physical unit

°C   Degrees Celsius, physical unit

°DK   Degrees throttle-valve angle, physical unit

°F   Degrees Fahrenheit, physical unit

°KW   Degrees crankshaft, physical unit

°NW   Degrees camshaft, physical unit

1/CM3   1/cm³, per cubic centimeter, unit

1L   Axle 1 (usually front axle), left side

1R   Axle 1 (usually front axle), right side

2L   Axle 2, left side

2R   Axle 2, right side

2WD   2-wheel drive

3L   Axle 3, left side

3R   Axle 3, right side

4WAS   Four wheel anti skid, traction control system for four-wheel drive vehicles, refer also to ASR

4WD   4-wheel drive

4WS   Four-wheel steering. All 4 wheels are steered, not just the front wheels.

4X4   Vehicle with 4 wheels, all of which are driven (all-wheel drive). See also 4WD.

A   Ampere, physical unit, or Austria

A/C: Air Conditioning Luftkonditionering  

A/D   Analog/digital, usually A/D converter: converts analog signals (such as speed or oxygen sensor voltage) to digital signals that can be processed by a computer

A1   Axle 1, usually front axle

A2/3   Axles 2/3, rear axle(s)

AA   Automatically triggered alarm

AAC   Auxiliary-air control valve

AAP   Acceleration auxiliary pump

AAS   Drive-off assistant

AAV   Activated charcoal filter shutoff valve

AB   Airbag, usually proper name

ABC   Active body control, chassis, see also ADS

ABD   Automatic braking differential, usually proper name

ABE   General operating licence, model approval of car for operation on public roads

ABS   Anti-Blocking System, usually proper name

ABS 2   Anti-Blocking System separate, system name, proper name

ABS 3   Anti-Blocking System integrated in brake booster, system name, proper name

ABS: Antilock Brake System Antihjullåssystem  

ABV   Auxiliary-air valve or Automatic blocking prevention, another term for ABS

AC   Air conditioning, air conditioner, or Alternating current

ACC   Adaptive cruise control

ACD   Active centre differential, automatic limited-slip differential (Mitsubishi)

ACM   Airbag Control Module

ACM: Alternator Control Module Generatorns kontrollenhet  

ACT   Air charge temperature. Temperature of charge air with turbocharger.

ADA   Atmospheric-pressure dependent full-load stop with distributor injection pumps

ADAM   Advanced dynamic aid mechanism, mechanical braking assistant (Teves). See also BAS.

ADAPT   Adaptation, adaption

ADB   Automatic differential brake. BMW system replacing conventional limited-slip differentials (ensures traction by braking wheels). Subfunction of DSC (BMW ESP).

ADF   Atmospheric pressure sensor

ADM: Additive Dosing Module Styrenhet för bränsle  

ADN   Yemen

ADR   Automatic distance control, proper name (VW), or Trigger duration control

ADS   Automatic throttle-valve actuator or Active driving system or Adaptive damping system

AEI   Advance electronic ignition, fully electronic ignition system

AEM: Accesory Electronic Module Översättningsenhet mellan vissa tillbehör (t.ex. fjärrstart till bränslevärmare och backvarnare t.o.m. -04) och CAN-systemet  

AEU   Outside Europe

AFB   Atmospheric-pressure dependent start-of-delivery

AFI   Air-supported fuel injection

AFS   Advanced front-lighting system. Variable light distribution via movable reflectors

AG   Automatic transmission

AGN   Exhaust-gas aftertreatment

AGR   Exhaust-gas recirculation

AGRV   Exhaust-gas recirculation valve

AHK   Trailer coupling, or Active rear-axle kinematics

AHM   Auxilliary Heater Module

AHS   Alcohol sensor

AHV   Trailer brake valve

AI   Air injection

AICC   Autonomous intelligent cruise control (speed and distance)

AIV   Air injection valve

AK   Automatic clutch. Clutch operates when driving off, shifting, and stopping.

AKEK   Automatic child-seat detection, usually integrated into an airbag system

AKF   Activated charcoal filter

AKS   Automatic clutch system. Clutch engagement/disengagement is automatic. The clutch pedal is no longer needed. Used for example in Renault Twingo; see also EKS, or Active headrest system (BMW)

AKSE   Automatic child-seat detection

AKT   Active, or Current

ALB   Automatic load-dependent braking force control

ALC   Adaptive light control. The headlight illumination is distributed variably according to the driving situation (city, country, motorway). (BMW)

ALDA   Absolute measurement, boost-pressure dependent full-load stop

ALDL   Assembly Line Diagnostic Link, Opel diagnostic plug

ALFB   Atmospheric pressure and load-dependent start-of-delivery

ALG   Axle load sensor

ALR   Automatic longitudinal control

ALU   Arithmetic and logic unit (microcomputer), proper name

ALV   Axle load distribution (drive-off aid)

ALWR   Automatic headlight vertical aim control

AM   Central America

AMIC   Automotive Multimedia Interface Collaboration, Gremium zur Entwicklung eines Multimediastandards, besteht im wesentlichen aus führenden Automobilherstellern

AMR   Drive torque control

ANC   Active noise control. System actively influences the intake noise, reducing it by about 15 dB.

AND   Logical AND operator

AOC: Active On-demand Coupling Den koppling som kopplar i och ur fyrhjulsdriften i det Haldexsystem som används fr.o.m. årsmodell 2003  

AOS   Automatic Ocupant Sensing

AP   Air pump

AP: Accelerator Pedal Gaspedalen  

APB   Active parking brake. Teves system containing interface to electronics, with driver-assistance functions such as drive-off assistance, parking aid, and immobilizer.

APS   Autopilot system

AQS: Air Quality Sensor Luftkvalitetssensor (Se IAQS)  

ARA   Anti-jerking control

ARD   Active jerking suppression

ARF   Exhaust-gas recirculation

ARFR   Exhaust-gas recirculation rate

ARMADA   Triggering unit for restraint systems with external differentiated triggering. Airbag system from DaimlerChrysler.

ARMIN   Trigger unit for restraint systems with integrated emergency-call control

ARR   Exhaust-gas recirculation control

ART   Distance-based cruise control

AS   Air intake or Towing protection or South America

ASC   Automatic stability control, controlled force transmission

ASC+T   Automatic stability control, regulated force transmission with traction control

ASD   Automatic limited-slip differential, usually proper name

ASF   Audi Space Frame, special construction for aluminium frame in Audi A2 and A8

ASG   Attachment control unit or Semi-automatic transmission

ASM   Asynchronous machine

ASM   Alarm Siren Module

ASMS   Automatic stability management system. See also ESP.

AS-NO   Exhaust-gas sensor for NOx (nitrogen oxide) content

ASP   Shutoff valve for ASR brake control

ASR   Transmission slip control, usually proper name

ASR 2   Transmission slip control, separate, system name, proper name

ASR 3   Transmission slip control, integrated, system name, proper name

AS-T   Exhaust-gas sensor for temperature

ASV   Air switching valve, air intake valve or Trailer control valve

AT   Automatic transmission

ATB   Exhaust-gas temperature limitation

ATF   Exhaust-gas temperature sensor or Automatic transmission fluid

ATG   Replacement transmission

ATL   Exhaust-gas turbocharger

ATM: Antenna Tuner Module Antennstyrenhet. Tar hand om signaler från AM/FM, TMC och GPS. Endast XC90  

ATWS   Anti-theft warning system (Opel)

AU   Exhaust-gas inspection

AUD: Audio Module Styrenhet för ljudsystemet. Endast XC90  

AUM: Audio Module Styrenhet för ljudsystemet   

AUS   Australia

AUS   Ultrasonic Alarm System

AUT   Automatic transmission

AV   Outlet valve or Shutoff valve

AW   Drive shaft

AWD: All Wheel Drive Volvos beteckning på fyrhjulsdrift  

AWG   Evaluation switching unit

AWK   Spare piston, used if proper piston does not function

AWN   ASA Workshop Network, proper name

AWR   Distance warning radar

AWS   Evaluation switching unit (Bosch KH)

AY   Lateral acceleration. A=acceleration, Y=lateral direction

AYC   Active yaw control. Rear-axle limited-slip differential (Mitsubishi). See also ACD.

AYC: Active Yaw Control Volvos beteckning på ett antisladdsystem som motverkar sladd genom att bromsa ett eller flera enskilda hjul. Ingår i DSTC.  

AZG   Adaptive cylinder equalisation. Quantity equalisation control.

B   Internal combustion engine (petrol) or Bank or Belgium

B-   Battery negative voltage

B.C.D.D.   Vacuum controlled idle air correction

B.P.T.   Pressure control valve

B+   Battery positive voltage

BA   Acceleration sensor or Brake assistant (Mercedes Benz)

BAR   bar, physical unit

BAS   Brake assistant system

BBA   Service brake system. Enables the driver to reduce the speed of a vehicle in steps during operation (including to standstill). In addition to the service brake system, a vehicle can have a parking brake, a retarder system, or an auxiliary braking system. A service brake system can be a single- or multiple-circuit system and can work mechanically, hydraulically, or pneumatically.

BBR   Wideband noise test, method for testing potentiometers

BBUS   Body Bus

BBV   Service-brake valve. Component of service brake system. See also BBA.

BC   Blink code

BCM   Body control module (Opel and GM)

BCM: Brake Control Module Styrenhet för hela bromssystemet  

BD   Bd: baud. Unit for data transmission rate. 1 baud is 1 bit/second.

BDE   Petrol direct injection

BDM   Petrol/diesel speed measurement module

BEA   Bosch Emissions Analysis, product name for exhaust-gas tester (Bosch)

BEV   Battery electric vehicle

BF   Passenger, or passenger-side

BFA   Passenger airbag. See also BF-AB.

BF-AB   Passenger airbag

BFL   Brake fluid level

BFS   Passenger side

BG   Brake assembly, integrated ABS, or Bulgaria

BHKZ   Battery high voltage capacitor ignition

BIP   Start pulse

BKL   Brake indicator light

BKR   Braking force control

BKU   Braking force support

BKV   Power brakes

BLDC   Brushless direct current motor

BLIS: Blind Spot Information System Volvosystem för att varna föraren för fordon som befinner sig i backspeglarnas så kallade döda vinkel  

BLS   Brake light switch

BLU   Brake light suppression. Activated when the brake assistant carries out a "preliminary charge". The main brake cylinder is actuated, leading to actuation of the light switch. Since the driver has not braked, switch-on of the brake light must be suppressed

BM   Reference mark

BMR   Braking torque control

BOU   Brake operating unit, controls and activates the brakes

BPA   Start of paraffin precipitation. Also called cloud point. Temperature at which paraffin crystals precipitate out of diesel fuel.

BPS   Brake test stand

BR   Brake control for ASR or Brazil

BRP   Wideband noise test, method for testing potentiometers

BS   Brake disc or Acceleration sensor

BSA   Brake system analysis, product name for brake test stand (Bosch)

BSC: Body Sensor Cluster Känner av karossens acceleration i olika riktningar. Ingår i DSTC  

BSU   Special brake inspection

BT   Brake drum

BTC   Bosch traffic controller, traffic monitoring system

BTS   Battery disconnect switch (Mercedes)

BV   Brake valve

BVA   Brake wear indicator

BWN   Bosch Workshop Network, proper name

BVSV   Bimetallic-controlled vacuum switching valve or Bimetallic vacuum switching valve

BZ   Brake cylinder

BZM   Reference mark

BZW   respectively, or, and/or

C   Capacitor, capacitance, or Chassis (OBD error codes, for example) or Cuba

C.R.   Compression ratio

C3/B7   C3/B7 signal (speed signal for trip recorder)

CAA   Clean Air Act (US exhaust-gas regulations)

CAC: Charge Air Cooler Laddluftkylare (finns endast på turbomotorer)  

CAL   California

CAN   Controller Area Network, mini-network for exchanging data between computers, proper name

CAN: Control Area Network Den typ av datanät som svarar för merparten av datakommunikationen mellan bilens olika enheter (se även LIN)  

CANDI   Can Diagnostic Interface

CAN-H   CAN High. One of the two data lines in the CAN bus system. See also CAN.

CAN-HI   CAN High. One of the two data lines in the CAN bus system. See also CAN.

CAN-L   CAN Low. One of the two data lines in the CAN bus system. See also CAN.

CAN-LO   CAN Low. One of the two data lines in the CAN bus system. See also CAN.

CARB   California Air Resources Board (US air-pollution authority), proper name

CARIN   Autopilot system, Mercedes

CAS   Computer aided service, proper name

CAS   Collision Avoidance

CAT   Catalytic converter

CB   Vacuum control of starting mixture

CBC   Cornering brake control

CC   Cruise control. See also ACC

CCM   really ccm or cm³, cubic centimeters, unit of volume

CCM: Climate Control Module Kontrollenhet till klimatanläggning (Se ECC)  

CCW   Counter clockwise, e.g. for indicating direction of rotation of engine

CD   Compact disc

CDCR   Compact Disc Changer Rear

CDI   Common Rail direct injection (in Mercedes and MCC)

CDL   Central door locking, central locking system limited to doors (Opel)

CDN   Canada

CELIS   Central lighting system (Hella)

CEM   Centralised Electronic Module (Volvo)

CEM: Central Electronic Module Elcentral med säkringar, reläer och strömförsörjning till div strömförbrukare placerad på vä. sidan av intrumentpan. (Se även REM)  

CFG   Configuration

CFI   Cylinder-individual injection system, proper name

CFPP   Cold filter plugging point (for diesels)

CGI   Stratified charge gasoline injection, petrol direct injection with stratified charge through throttle valve and with compressor charging (Mercedes)

CH   Hydrocarbon (normally HC). In conjunction with exhaust-gas systems, HC is understood to be the portion of unburned fuel in the exhaust, or Switzerland (Confoederatio Helvetica)

CH4   Methane, main component of natural gas (90%), compressed as fuel for natural-gas-powered cars. See also CNG

CI   Ivory Coast

CID   Camshaft identification (position) sensor

CID   Colour Info Display

CIFI   Cylinder-individual fuel injection, usually proper name

CIM   Column Intergration Module

CIN   Calibration identification number. Part of OBD, consists of 3 letters and at most 12 digits. Can indicate hardware level, for example.

CKP   Crankshaft positioning sensor

CMH   Mixture preheating

CMP   Camshaft positioning sensor

CMP: Camshaft Position Sensor Kamaxelpositionssensor  

CNG   Compressed natural gas, fuel for vehicles with gas-powered engines

CNG: Compressed Natural Gas Naturgasbränsle.   

CNS   Combustion noise sensor, measures combustion noises (knock sensor)

CO   Carbon monoxide. Poisonous gas present in exhaust gas. Produced during combustion of carbon with insufficient oxygen, or Colombia

CO2   Carbon dioxide, non-poisonous gas produced during combustion, also known as greenhouse gas

COMAND   Cockpit management and data systems. System for data exchange and driver information management.

CP: Canister Purge Valve Ventil i EVAP-systemet som reglerar när bränsleångor släpps ut till motorn  

CPM: Combustion Preheater Module Bränslevärmarens kontrollenhet  

CPS   Camshaft position/speed sensor / Crankshaft position sensor

CPU   Central processing unit (microprocessor)

CPV   Constant pressure valve

CPX   CPx: high-pressure pump of a Common Rail diesel system, such as CP2. It is used in commercial vehicles.

CR   Common Rail. See CRS.

CRC   Cyclic redundancy check. Method for generating a checksum, proper name

CRI   Common Rail injector. Injector of a Common Rail system, comparable to the injection valve of a conventional injection system.

CRIN   Car radio identification number

CRP   Common Rail pump. Special high-pressure pump for the Common Rail system, or Car phone (Opel)

CRS   Common Rail system. Special diesel direct-injection system in which the fuel is distributed to the injectors via a common line (Common Rail) under high pressure.

CRT   Master computer or Continuous catalytic converter regeneration by burn off at 300°C with after-injection

CRW   Common Rail parameters (also CR-W)

CS   Crankshaft

CSCV   RPM control valve

CTG   CAN tester (Mercedes)

CTS   Cooling temperature sensor, Kühlmittel-Temperatursensor

CTX   Continuously variable transaxle

CV   Check valve, shutoff valve, throttling non-return valve

CW   Drag coefficient, characteristic value for aerodynamics or drag, determines drag together with frontal area of vehicle or clockwise, e.g. for indicating direction of rotation of engine

CVN   Calibration verification number. Part of OBD, contains the checksums for parameter settings, for example.

CVT   Continuously variable transmission

CVVT Continuously Variable Valve Timing Kontinuerligt variabla ventiltider  

CZ   Czech Republic

D   Diesel engine or Decimal number or Drive (position of automatic-transmission selector lever) or Germany

D3   German exhaust-gas standard, parallel to European standard. Corresponds largely to EU3. See EU3 and EURO3.

D4   German exhaust-gas standard, parallel to European standard. Corresponds largely to EU4. See EU4 and EURO4.

DA   Boost pressure dependent full-load stop

DAB   Digital audio broadcasting

DBC   Dynamic brake control

DBE   Roof operating unit, control unit in Mercedes, usually proper name

DBG   Flow limiter

DBR   Retarder (sustained action brake) or Retarder relay

DBV   Pressure limiting valve

DC   Direct current or DaimlerChrysler

DCU   Diesel control unit or Dosing control unit. Unit for injection of urea (serves to reduce NOx).

DD   Fuel pressure limiter

DDA   Digital directional antenna, special antenna which blocks out radio wave reflection interference

DDE   Digital Diesel Electronics, system name, usually proper name, or Direct data exchange

DDM   Engine speed versus alternator residual ripple or driver door module (Opel)

DDM   Drivers Door Module

DDM: Driver Door Module Kontrollpanelen på förarens dörr med fönsterhissknappar, spegeljustering m.m (Se även PDM)   

DDS   Diesel theft protection

DECT   Digital enhanced cordless telecommunications, standard for data transmission, usually proper name

DEE   Digital engine electronics

DEM: Differential Electronic Module Styrenhet för fyrhjulsdrift  

DF   RPM sensor, or Pressure sensor, or Direct-fire, distributorless coil ignition with double ignition coil

DFA   Speed sensor output

DFB   Flow limiter (Common Rail) or Dynamic start-of-delivery setting

DFC   Deceleration fuel control

DFCO: Deceleration Fuel Cut Off Avstängning av bränsletillförseln vid motorbroms   

DFHL   Speed sensor, left rear

DFHR   Speed sensor, right rear

DFM   Dynamo field monitor. Output for recording dynamo field

DFS   Double-spark coil, supplies two cylinders

DFVL   Speed sensor, left front

DFVR   Speed sensor, right front

DG   Speed sensor, or Speed sensor for transmission input speed

DGI   Direct gasoline injection

DHK   Nozzle holder combination

DI   Direct (diesel) injection, system name, usually proper name

DI/DIST   Distributor type

DIA   Diagnosis

DIAGK   Diagnosis K line, communication line

DIAGL   Diagnosis L line, signalling line

DIGI   Digiplex (Marelli)

DIGIJET   Digitally controlled fuel injection, system name, proper name

DIGIPLEX   Fully electronic ignition system, system name, proper name

DIGNITION   Electronic ignition system, system name, proper name

DIM: Driver Information Module Kombinationsinstrumentet med hastighetsmätare, varvräknare etc  

DIN   German Industrial Standard

DIO   Data input/output. Interface for exchanging data in both directions.

DIS   Direct ignition system, proper name

DISA   Differential intake manifold system (switchable, variable-length intake manifold)

DK   Throttle valve or Denmark

DKA   Throttle valve actuator, Ecotronic

DKE   Throttle valve incrementation bit

DKG   Throttle valve sensor, detects current position of throttle

DKI   Throttle valve actual value. Current throttle-valve voltage

DKP   Throttle valve potentiometer

DKR   Throttle valve reduction or Throttle valve reduction bit

DKS   Throttle valve switch

DKV   Throttle valve preset

DLB   Compressed-air brake

DLC   Data link connector. Diagnosis connection

DLI   Distributorless ignition

DLK   Dynamic steering correction

DLOC   Device location, Einbaulage einer Komponente

DLS   Digital idle stabilisation

DLWR   Dynamic headlight vertical aim control

DM   dm: decimeter DM: Diagnosis module

DM3/H   dm³/H: cubic decimeters per stroke, unit

DME   Digital Motor Electronics (Motronic), system name, proper name

DMM   Digital multimeter

DMS   Elongation measurement sensor

DMV   Diesel solenoid valve

DOHC   Double overhead camshaft, usually part of engine designation

DP   Dashpot, or Throttle valve closing damper

DPF   Diesel particle filter

DPFE   Delta pressure feedback electronic system or Differential pressure feedback, EGR

DPHI   dphi, delta phi, difference angle. See also PHI.

DQ   dQ: delta quantity, difference quantity. See also Q.

DR   Pressure regulator

DRM   Pressure regulator module

DRS   Rotation rate sensor, sensor for vehicle dynamics control

DRV   Pressure regulator valve

DS   Pressure switch or Pressure sensor

DSA   Dynamic stability assistance

DSA: Dynamic Stability Assistance Volvos beteckning på ett antispinnsystem som arbetar i högre hastigheter med hjälp av vridmomentsänkning. Ingår i STC  

DSB   Pressure sensor in/for combustion chamber

DSC   Dynamic stability control

DSE   Thermal-expansion material element, expands or contracts when heated

DSG   RPM target value sensor

DSM   Drivers Seat Module

DSP   Display, or Dynamic shift program (automatic transmission), or Digital sound package (VW audio equipment variant), or Digital sound processor, special processor for digital processing of audio signals

DSS   Pressure-jump switch

DSTC   Dynamic stability and traction control

DSTC: Dynamic Stabillity and Traction Control Volvos antisladdsystem. Inkluderar STC men innehåller ytterligare komponenter, främst i syfte att motverka sladd  

DSU   Pressure sensor for ambient pressure

DSV   Pressure control valve

DTC   Diagnostic trouble code

DTC: Diagnostic Trouble Code Felkod som kan läsas ut ur OBD urtaget  

DTI   Diesel direct-injection with distributor pump (Opel)

DTR   Distronic. Distance control system (Mercedes)

DV   Pressure supply, or Throttle device

DWA   Theft warning system, BMW-specific designation

DVD   Digital versatile disc. Storage medium with significantly higher storage capacity than a conventional CD.

DVH   Pressure valve holder

DWS   Rotation angle sensor

DYN   Dynamic

DZ   Breakthrough ignition or Algeria

DZG   RPM sensor

DZV   Digital ignition, fully electronic

E   Electrical fan, or Fuel-injection engine, or Economy (shifting program for automatic transmissions), or Spain (España)

EA   Original equipment

EAG   Electronic automatic transmission

EAI   Electronic advanced ignition, electronic ignition-curve control, ELZ

EAK   Kenya

EAS   Electronically autonomous starting system or electronic actuation system, usually trade name or electronic air suspension (VAG)

EAV   Element shutoff valve. Shuts off an individual element of the high-pressure pump in the Common Rail system.

EBA: Emergency Brake Assistance System som ger bromskraftsförstärkning vid panikbromsning. Ingår som en del av DSTC  

EBC   Electronic brake force control (see EBD and EBV)

EBCV   Electrical auxiliary air control valve

EBD   Electronic braking differential or Electronic brake force distribution (see also EBC and EBV)

EBD: Electronic Brake Distribution System som optimerar bromskraftsfördelningen mellan fram- och bakaxel  

EBM   Electronic brake management system. Optimises driving stability, traction, and braking function (BMW)

EBS   Electronic braking system

EBV   Electronic brake force distribution (see also EBD and EBC)

EC   Ecuador

ECABS   Electronic air cushioning, combined with ABS

ECC   Electronic climate control, electronically controlled air conditioner (Opel)

ECC: Electronic Climate Control Automatisk klimatanläggning (i motsats till manuell)  

ECD   Electronically controlled deceleration

ECE   Economic Commission of Europe, proper name

ECI   Electronically Controlled Injection, system name, usually proper name

ECM   Electronic Control Module, system name, usually proper name

ECM: Engine Control Module Motorns huvudstyrdator.   

ECO   Ecotronic, system name, usually proper name

ECON   ECOn: Electronic carburetor, n=version, usually proper name

ECONZ   ECOnZ: Electronic carburetor and electronic ignition, n=version number, usually proper name

ECT   Engine coolant temperature, or temperature sensor

ECT: Engine Coolant Temperature Kylvätsketemperatur  

ECU   Electronic control unit, proper name

EDC   Electronic diesel control, usually proper name

EDC: Engine Drag Control System för reglering av motorbromsen  

EDG   Electronic diesel control with integrated transmission control. MCC control unit, proper name.

EDIS   Electronic documentation and information system (Bosch)

EDIS 4   EEC IV with distributorless ignition system (Ford)

EDR   Electronic diesel control NFZ-DB

EDS   Electronic differential lock, usually proper name

EDW   Electronic anti-theft warning system or Electronic pressure transducer

EEC   Fully electronic engine control or Electronic ignition timing, proper name

EEC IV   Electronic engine control system IV (Ford), system name, proper name

EECS   Fuel vapour emission control system

EEM   Electrical energy management. Higher-order system that coordinates the interaction of the generator, battery, voltage converter, drive train, and loads. See also EES and VSC.

EEPROM   Electrically erasable programmable read-only memory, proper name

EES   Electrically unlocked starting quantity, or Electrical energy systems (onboard network of the future (42V generator for electromagnetic valves, for example, 14V DCDC converter for rest of network)

EFI   Electronic fuel injection, usually proper name

EFP   Electronic accelerator pedal, proper name

EFS   Single-spark coil, supplying one cylinder

EGAS   Electronic accelerator pedal, proper name (electronic throttle control, ETC)

EGD   Electronically regulated shock absorption

EGE   Electronic air dryer unit

EGN   EGn: EGAS control unit, n=version, usually proper name

EGO   Exhaust Gas Oxygen Sensor, unbeheizte Lambdasonde

EGR   Exhaust gas recirculation

EGR: Exahust Gas Recirculator EGR-ventilen sköter om återcirkulation av avgaser till insuget. Detta är en del av avgasreningssystemet.   

EGS   Electronic transmission control

EHA   Electronic automatic heater, usually proper name

EHAB   Electrohydraulic shutoff

EHB   Electrohydraulic brake

EHCM   Electrohydraulic control module

EHPS   Electrohydraulic power steering

EHR   Electrohydraulic lifting control

EHS   Electrohydraulic control module

EHSW   Electrohydraulic positioner

EHU   Entertainment Head Unit

EI   Electronic ignition

EKE   Electronic fuel injection, proper name

EKM   Electronic clutch management

EKP   Electric fuel pump

EKRG   Simple short-circuit ring sensor

EKS   Electronic clutch system. Clutch engagement and disengagement is automatic. The clutch pedal is no longer needed. See also AKS.

ELAB   Electrical idle shutoff valve

ELB   Electronically controlled brake

ELD   Electrical load-peak damping

ELF   Electronic air cushioning

ELFI   Electronic vehicle identification. Component of VW ELSA service information system.

ELR   Electrical ignition system with ignition curve adjustment or Electronic idle control

ELRA   Electronic automatic restraint. Automatic seat belts (VW)

ELS   Electronic idle stabilisation

ELSA   Electronic service information system. VW system for authorised workshops (garages). Comprises the components ELFI, ELWIS, and ETKA.

ELV   Electrical air valve, or Electronic steering or steering-column lock. See also ESL.

EL-V   Electronically controlled carburetor

ELWIS   Electronic shop information system. Component of the VW ELSA service information system.

ELZ   Electronic ignition

EMAB   Shutoff by electromotor

EMB   Electromechanical brake

EMC   Electromagnetic compatibility (see also EMV)

EMF   Electromechanical parking brake.

EMI   Injection volume indicator

EML   Electronic engine performance control, proper name

EMR   Electronic volume reduction

EMS   Electronic engine control, proper name

EMSE   Electromagnetic start enable

EMV   Electromagnetic compatibility (EMC)

ENG   Engine type (code letters), or Engine

ENG FAIL   Engine failures, diagnosis line for outputting errors

ENR   Electronic level control

EOBD   European on-board diagnosis, internal vehicle diagnosis with external tester conforming to European guidelines. Serves primarily to record exhaust-gas related faults. Usually trade name

EOL   End of line, usually in conjunction with end-of-line programming

EP   Adjustment point

EPA   Environmental Protection Agency, air purity monitoring organisation

EPAS   Electric power-assisted steering

EPB   Electropneumatic brake

EPB   Electronic Park Brake

EPC   Electronic power control or Electronic pedal control (such as with ME-Motronic systems without mechanical throttle cable)

EPI   Exhaust Port Injection, Nacheinspritzung in Auslasskanal (Toyota)

EPK   Electropneumatic kit

EPROM   Erasable programmable read-only memory, programmable or erasable with UV light, proper name

EPS   Extended park position, or Injection pump test bench, sometimes used as a product identification (such as EPS 944)

EPSV   Electrical injection adjustment

EPT   Electronic pressure transmission

EPW   Electro-pneumatic transducer, serves to transform electrical signals into pneumatic signals such as in boost-pressure regulation

ER   Energy reserve

ERE   Electronic inline injection system (special engine control) or Electrical regulator

ERW   Energy reserve with voltage converter

ERWIN   Electronic repair and workshop information. VW electronic service information system for independent workshops (garages) and fleet operators. Information offering is restricted compared to ELSA.

ES   Electronic control unit or El Salvador

ESA   Emissions system analysis, product name for exhaust-gas tester (Bosch) or Electronic spark advance

ESA/IZA   Map ignition, ignition coil in distributor

ESC   Escape key on PC or Map ignition or Electronic spark control, electronic ignition control up to knock region, with knock sensor

ESG   Single-pane safety glass or Electronic switching unit for trailer detection (used in brake systems)

ESGN   ESGn: Special equipment, e.g., NWS, ETS, KGE, n=version no.

ESL   Electronic steering lock. See also ELV.

ESP   Electronic stability program, another designation for vehicle-dynamics control (FDR), usually proper name

ESPV   Electrical injection adjustment

ESR   Electronic slip reduction, another name for ASR, or Electrical sunroof, electrically operated sunroof (or lifting roof)

ESS   Electronic suspension systems. Continental Teves electronic air cushioning system. The system adapts automatically to vehicle load conditions, has continuously variable damping, and works together with ESP.

ESSD   Electrical steel sunroof

EST   Electronic spark timing, electronic map ignition control. See also MSTS

ESV   Feed valve or Injection valve

ET   Egypt

ETA: Electronic Throttle Actuator Gasspjällsmotor (Bosch). Infördes 2002 på turbomotorer och 2003 på sugmotorer (se även ETM)   

ETC   Electronic throttle control, usually proper name or Electronic traction control

ETKA   Electronic parts catalogue. Component of the VW ELSA service information system.

ETM   Electronic transmission management, usually proper name

ETM: Electronic Throttle Module Gasspjällsenhet (Magneti Marelli). Fanns t.o.m. 2001 på turbomotorer och t.o.m. 2002 på sugmotorer (se även ETA)  

ETS   Electronic thermostat control, usually proper name or Electronic traction system, see ETC

ETV   Electronic throttle valve

EU   European Union

EU3   European exhaust-gas standard, valid from 2000 (levels: HC 0.2, CO 2.3, NOx 0.15)

EU4   European exhaust-gas standard, valid from 2005 (levels: HC 0.1, CO 1.0, NOx 0.08)

EUI   Electronic unit injector, injection nozzle of pump-nozzle system (diesel injection)

EUP   Electronic unit pump, diesel pump of pump line nozzle system (diesel injection)

EURO3   European exhaust-gas standard, valid from 2000 (levels: HC 0.2, CO 2.3, NOx 0.15)

EURO4   European exhaust-gas standard, valid from 2005 (levels: HC 0.1, CO 1.0, NOx 0.08)

EUV   Electro-reversing valve

EV   Injection valve or Inlet valve of pressure control valve or Inlet valve of ABS system

EV1   Injection valve for high pressure

EV2   Injection valve for low pressure

EVA   Electrical full-load stop or Emergency valve assistance, safety valve

EVAP   Fuel vapor emission control

EVAP: Evaporative Emission Control System System som förhindrar att bränsleångor släpps ut i atmosfären  

EWD   Single-coil actuator, servomotor with one winding

EVE   Electronic distributor injection system (special engine control)

EWL   External warning lamp

EWM   Electronic selector-lever module. Control unit in Mercedes, usually proper name

EWMA   Exponential weighted moving average, misfire detection during last 10 driving cycles

EVR   Electronic vacuum regulator

EWS   Electronic immobilizer

EX   Exhaust (or outlet, exhaust-gas recirc. valve, exhaust manifold)

EZ   Electronic ignition, usually proper name

EZE   Electronic central control unit, usually proper name

EZF   Electronic ignition system, map-controlled

EZF-H   Electronic ignition system with map, trigger by Hall sensor

EZF-I   Electronic ignition system with map, trigger by inductive sensor

EZK   Electronic ignition with knock control

EZ-K   Electronic ignition timing with knock controls, proper name

EZL   Electronic ignition system with characteristic curves

EZL-H   Electronic ignition with characteristic curves, trigger by Hall sensor

EZS   Electronic ignition switch

EZV   Electronic ignition timing

F   France

F/P   Fuel pump

FA   Front axle

FAB   Failcode Airbag. Output line for error codes for airbag system (Mazda)

FAC   Failcode Air Conditioning. Output line for error codes for air conditioner (Mazda)

FAP   Accelerator pedal or Vehicle analysis protocol. Log maintained by tester during diagnosis. Can be printed and given to vehicle owner as evidence of repairs performed..

FAS   Driver-assistance system

FAT   Failcode Automatic Transmission. Output line for error codes for transmission control (Mazda)

FB   Fast burn, rapid spread of flame front or Start-of-delivery, key parameter in diesel injection systems or Remote control

FBA   Parking-brake system (usually hand brake)

FBB   Start-of-delivery blocking

FBG   Start-of-delivery sensor

FBKW   Crankshaft angle at start-of-delivery

FBN   Start of delivery, normal

FBR   Start-of-delivery control

FBS   Driving enabling system (Mercedes), or Failcode Brake System. Output line for error codes for ABS system (Mazda)

FBV   Parking brake valve

FC   Fault (error) code

FC: Engine Cooling Fan Motorns kylfläkt  

FCKW   Chlorofluorocarbon (CFC). Gaseous chemical compound that destroys the ozone layer. Contained in old refrigerants (R12) for air conditioners.

FCV   Fuel cell vehicle. Vehicle with fuel-cell drive, up to now only a Ford prototype.

FD   Date of manufacture

FDI   Fuel direct injection, gasoline direct injection, refer also to GDI

FDR   Trip computer or Vehicle dynamics control

FDS   Ford diagnostic system

FE   Delivery units, parameter for determining delivered fuel amount

FEC   Front Electrical Centre

FEN   Failcode Engine. Output line for error codes for engine control unit (Mazda)

FES   Spark energy control

FFG   Accelerator pedal

FFR   Vehicle master computer. Diagnostic gateway in vehicle, installed in combined instruments or central electrical system. Also contains the immobilizer.

FGB/AGB   Speed limiter / automatic speed limiter, usually proper name

FGB/GBA   Speed limiter / speed limiting system, usually proper name

FGG   Speed sensor

FGR   Speed control, usually proper name

FH   Power window

FHE   Road and obstacle detection

FHM   Power window motor

FI   Filter

FICD   Fast-idle control device

FIN   Finland

FIS   Vehicle information system. Product designation (such as FIS 215)

FJI   Fiji Islands

FKT   Function

FKTSCH   Function switch

FLA   Vehicle performance analysis, product name for performance test stand (Bosch), or Spring-loaded idle stop

FM   Vehicle management

FMN   Delivery volume normal

FMVSS   Federal motor vehicle safety standard

FN   Vehicle level

Four-C: Continuously Controlled Chassis Concept Volvos aktiva fjädringssystem  

FP   Accelerator pedal or Delivery pump

FP: Fuel Pump Bränslepumpen  

FPK   Freely programmable combined instruments

FPM   Accelerator pedal module

FPR   Fuel pump relay

FR   FR signal: provides engine or engine/transmission control unit with information about generator load.

FRS   Freewheel pulley

FS   Driving-mode switch or Driver side

FSA   Vehicle system analysis, product name for engine tester (Bosch)

FSD   Folding sunroof

FSG   Chassis control unit or Fill-level sensor

FSK   Frequency shift keying

FSR   Driving stability control

FSS   Delivery signal sensor, or Flexible service system

FTCO   Flat tachograph (new, flat design), Mercedes

FV   Filling valve

FWA   Chassis analysis. Sometimes also used as product designation (such as FWA 400)

FWI   Vehicle-travel pulse number

FZ   Vehicle

FZG   Vehicle

FZK   Vane compressor

FZR   Vehicle controller, ESP system component

G   g: Acceleration of gravity, or gram, physical unit G: G-signal : crankshaft signal for TDC, 4 signals for the control unit per distributor rotation

G/SEC   g/sec: grams per second, unit

G/ZYL   g/Zyl: grams per cylinder, unit for mass per cylinder

GA   Basic adaptation or Guarantee

GATES   Global automotive telematic standard

GB   Yawing moment restriction or Great Britain

GBA   Seat belt positioner drive

GBR   Seat belt positioner

GDB   Regulated differential brake

GDI   Gasoline direct injection, designation for petrol direct injection systems or vehicle models with this system. Usually proper name.

GDL   Gas pressure lamp (Audi)

GDL: Gas Discharge Lamp Gasurladdningslampa (Se även HID)  

GDM: Gas Discharge Lamp Module Styrenhet för xenonstrålkastare  

GDV   Constant pressure valve

GEN   Generator

GER   Germany

GGF   ggf.: possibly, if necessary

GGS   Transmission group switch

GHD   Housing cover

GID   Graphic information display (Opel)

GK   Glow plug

GM   Basic module, or Gear motor, or General Motors, proper name (name of vehicle manufacturer)

GMA   Yawing moment buildup delay

GMR   Mixture regulator

GND   Ground

GOL   Persian Gulf states

GPS   Global Positioning System, satellite system for locating a vehicle

GPS: Global Positioning System Module Satelitbaserad system för positionsbestämning. Även den del av RTI-systemet som fastställer var bilen befinner sig  

GR   gr: large Gr: Group GR: Gas retention, or Greece

GRA   Speed control system. Alternative term for cruise control.

GRV   Constant-volume valve

GS   Independent electronic transmission control, usually proper name, or Belt tensioner

GS 1.2   Electronic transmission control, Version 1.2, system name, proper name

GSG   Speed sensor

GSH   Gas sensor hydrocarbon, hydrocarbon sensor

GSK   Sheathed element glow plug

GSM   Global system for mobile communication

GSM: Gear Selector Module Växelväljaren för automatlådor  

GSR   Belt tensioner, usually proper name

GSS   Transmission shift lock or Seatbelt buckle switch

GST   Stepped start volume

GSY   Speed symbol. Specification on tyres for allowable speed, alphabetic. See also Speed Index

GUS   Belt tensioner or Commonwealth of Independent States (CIS)

GW   Gateway. PC or computer that connects and controls data exchange between two networks.

GWK   Transmission converter clutch

GZS   Glow duration control unit

H   h: hours H: hexadecimal number, or stroke, or Hungary

HA   Hydraulic stop or Rear axle or Hydraulic modulator for ABS

HAC   Height compensation

HAI   Hot-air inlet

HAS   Hand brake switch

HAU   Automatic heating

HBA   Hydraulic brake assistant or Hydraulically operated equalisation or Auxiliary brake system

HBZ   Master brake cylinder

HC   High compression or Version with high compression ratio or Hydrocarbon

HD   Heating wire or Lifting roof

HDC   Hill descent control. Special system that maintains speed downhill. Works using brake intervention at about 5 mph (8 km/h) (BMW and Rover offroad vehicles)

HDEV   High-pressure injection valve

HDF   Remote boot-lid release

HDI   High-pressure direct injection

HDK   Half-differential short-circuit ring travel sensor

HDP   High-pressure pump

HDS   Urea metering system, used with diesel vehicles to prevent or reduce soot emissions

HE   Main injection

HEGO   Heated exhaust-gas oxygen sensor

HEI   High performance ignition system, transistorized ignition, contactless ignition

HEV   High-pressure injection valve

HF   High frequency

HFG   Hand-operated gas delivery, for example in special vehicles for handicapped drivers

HFM   Hot-film air-mass sensor or Special engine control in which load detection takes place via a hot-film air-mass sensor

HH   HH division, 4/4 division of brake circuit: circuits 1 and 2 brake all wheels.

HHC   Hill Holder Control, ESP system component

HHT   Hand-held tester (such as KTS500 or PMS100)

HIC   Hot idle compensation

HID   Hill descent (sensor). Sensor that registers downgrades or vehicle rolling. See HDC.

HID: High Intensity Discharge Lamp Gasurladdningslampa, d.v.s. en lampa vanligen fylld med xenongas där glödtråden ersatts av en ljusbåge (Se även GDL)  

HK   Height correction or Hong Kong

HKD   High-voltage trigger diode, special diode installed in ignition coils

HKZ   High-voltage capacitor ignition

HL   Left rear

HLM   Hot-wire air-mass sensor

HO2S   Heated oxygen (O2) sensor

HO2S: Heated Oxygen Sensor Mäter syrehalten i avgaserna. Kallas ofta lambdasond  

HP   Hydraulic pump

HPA   hPa: hectopascal, physical unit

HPDI   High pressure direct injection

HPI   High-pressure injection. Direct-injection petrol engine used in Citroen and Peugeot. Comparable with GDI.

HR   Hybrid control, or Right rear, or Croatia

HRA   Rear window washing system

HSCAN   High-speed controller area network. CAN bus with high transmission rate (Opel). See also CAN, LSCAN, and MSCAN.

HSPV   Hydraulic injection timing device

HSV   High-voltage distribution or Hydraulic start lock

HT   HT division. 4/2 division of brake circuits: circuit 1 brakes all wheels, circuit 2 the front wheels

HU   Major inspection

HU-XXX: Head Unit Originalstereon (XXX är modellnumret t ex 603, 803, 650 osv.)   

HW   Hardware

HYAB   Hydraulic shutoff device

HZ   HZ: Master brake cylinder Hz: hertz, physical unit

HZR   Heating control. Simple type of air conditioner.

I   Italy

I1   Incremental system with one sensor

I2   Incremental system with two sensors

IAC   Idle air control, i.e. idle speed control, for injection engines

IAM   Independent after-market. Service or spare-parts dealers independent of vehicle manufacturer.

IAM: Integrated Audio Module Integrerad audioenhet (MD/CD-spelare). Endast XC90  

IAQS: Interior Air Quality System System för automatisk återcirkulation samt särskild rening av kupéluften  

IAT: Intake Air Temperature Insugningsluftens temperatur  

IC   Integrated circuit

IC: Inflatable Curtain Krockgardin   

ICC   Intelligent cruise control, Nissan distance control system; see also ACC.

ICE   Ignition control electronics, electronic ignition system

ICM   Ignition control module, or Integrated chassis management, BMW vehicle-dynamics control with trend-setting technology

ICM   Infotainment Module

ICM: Infotainment Control Module Styrenhet för "infotainment". Endast XC90  

ID   Identifier, bei CAN-Bus-Systemen eine Art Address-Byte, das angibt, für wen ein Datenblock bestimmt ist oder Identifikation

IDI   Indirect (diesel) injection

IDIS   Integrated driver information system, similar to navigation system

IDIS: Intelligent Driver Information System Volvosystem för att hjälpa föraren att på bästa sätt hantera information i komplexa trafiksituationer  

IDS   Interactive dynamic driving system

IFS   Inertia fuel shutoff. Safety fuel shutoff, or Independent front-wheel suspension

IFZ   Infrared central locking

IG   Pulse or increment transmitter, or Ignition

IHE   Integrated hydroelectronics unit. Control electronics, hydraulic generator, and electric motor in Citroen Hydraktiv chassis.

IHKA   Integrated heating and air conditioning system (BMW)

IHR   Heating control, usually proper name

IIA   Integrated ignition system

IL   Israel

ILV   Integrated quiet-running system

IMA   Integrated engine assistant (special Honda engine control), or Injector quantity analysis

IMM   Immobilizer

IMMO   Immobilizer

IMP   Pulse(s)

IN   Inlet (intake) manifold or valve

INA   Information display for ASR systems

IND   India

INFOANZ   Information display for ASR systems

INJ   Injector. Injection jet or valve in Common Rail diesel system

INT   Integrator

INZ   Central injection

IPBEC   Instrument Panel Body Electrical Centre

IPS   Intelligent Protection System, integrated two-stage airbag system with retractable pedals, head/shoulder airbags, and active headrests. Used in Ford Mondeo.

IR   Individual control with commercial-vehicle ABS systems, or Infrared, or Iran

IRF   Interior filter

IRM   Individual control, modified, with commercial-vehicle ABS systems

IRQ   Iraq

IRS   Interior protection

IS   Iceland

ISA   Idle speed correction or Intelligent speed adaptation: Use of a GPS system and traffic-sign database to automatically regulate speed (system still in test phase)

ISC   Idle speed control or Idle compensation

ISDN   Integrated Services Digital Network: digital telephone and data network with integrated services

ISF   Vehicle information system

ISIS   Intelligent safety system. System with multiple airbags, pyrotechnically triggered headrests, seat-belt tensioners and intelligent electronics (BMW)

ISO   International Organisation for Standardisation

ISO-EGO   Isolated Exhaust Gas Oxygen Sensor, isolierte unbeheizte Lambdasonde (mit Massekabel)

ISO-HEGO   Isolated Heated Exhaust Gas Oxygen Sensor, isolierte beheizte Lambdasonde (mit Massekabel)

ISS   Joint venture (Bosch, Michelin) for developing integrated vehicle dynamics systems

ISU   Intelligent switching unit (Siemens)

ITGS   Intelligent traffic guidance system (Mercedes)

IWG   Inductive travel sensor

IVLAN   In Vehicle Local Area Network

IWZ   Incremental angle/time sensor, rotation-angle sensor

IZA   Integrated ignition system

IZV   Infrared central locking

J   Japan

JA   Jamaica

JET   Jet, Jetronic: injection system, usually proper name

JOBD   Japanese OBD, OBD standard for Japan

JTS   Jet thrust stoichiometric. Direct-injection petrol engine (Alfa)

JW   Company car(s)

K   k: small K: channel K-line: bidirectional line between control unit and tester

KA   Knee airbag

KAM   Keep-alive memory

KAT   Catalytic converter

KB   Wire harness

KBA   Federal Motor Vehicle Office (Germany)

KBZ   Combination brake cylinder

K-CAN   Body CAN bus. Low-speed CAN bus for comfort-system and body electronics. See also PT-CAN and SI-BUS.

KD   Kickdown or Customer service

KD: Kick Down Den nedväxlingsfunktion som erhålls när man trycker gasen i botten på en bil med automatlåda  

KDS   Kickdown switch

KE   Continuous injection, usually proper name

KE-MOTRONIC   Continuous electronic injection system, usually proper name

KEN   KEn: Jetronic, continuous, with electronic extended-function unit, n=version, usually proper name

KF   Fuel filter

KFB   Fuel filter, petrol or Comfort zone

KFMG   Continuous delivery-volume meter

KFZ   Motor vehicle

KG   kg: kilogram, physical unit, or Keyless Go (access to vehicle and engine start without key)

KG/H   kg/h: kilograms per hour, unit

KGE   Crankcase ventilation

KIR: Key Integrated Remote Nyckel och fjärrkontroll i en enhet, även kallad stilettnyckel  

KIW   Combined instruments with service-interval indicator. See also SIA.

K-JETRONIC   Continuous injection system, usually proper name

KL   KL or Kl: Terminal

KLA   Automatic climate control

KM   km: kilometer, physical unit KM: small engine

KMA   Continuous volume analysis, product name (Bosch)

KMM   Continuous volume meter, checks fuel delivery

KMMG   Continuous volume meter, closed

KMV   Refrigerant compressor

KOM   Commercial bus and rental vehicles

KOMP   Component

KPA   kPa: kilopascal, physical unit

KPN   Kpn: Motronic (load detection occurs via intake manifold pressure, n=Motronic version, usually proper name)

KR   Anti-knock control

KRF   Kraftstoffrückführventil (Diesel)

KRS   Anti-knock control interface or Fuel return valve

K-RWG   Short-circuit ring sensor

KS   Fuel reservoir, or Knock sensor

KS: Knock Sensor Knacksensor  

KSA   Kingdom of Saudi Arabia

KSB   Cold-start accelerator, with distributor injection pumps

KSE   Child-seat detector

KSH   Cold-start aid

KSP   Fuel reservoir

KSS   Cold-start control

KSV   Cold-start valve

KSZ   Fuel distributor or distribution

KTF   Fuel temperature sensor, or Coolant temperature sensor

KU   Clutch

KU/GN   Clutch/transmission neutral position

KUKO   Coupling head

KW   kW: kilowatt, physical unit KW: crankshaft or crankshaft angle or shortwave (radio)

KVA   Fuel consumption gauge

KVD   Fuel evaporation

KWH   kWh: kilowatt-hours, physical unit

KWP 2000   Keyword Protocol 2000, log for transmitting diagnostic data

KVR   Fuel distributor tube

KVRS   Evaporative emission-control regeneration system, also referred to as tank ventilation system

KVRV   Fuel evaporation regeneration valve, tank ventilation valve

KVS   Fuel distributor piece

KWS   Comfort immobilizer

KWT   Kuwait

KX   Kx: Jetronic, continuous, with oxygen sensor control, usually proper name

KZS   Capacitor intermediate storage

L   l: liter, physical unit, or left L: left L-line: unidirectional line between control unit and tester

L/H   l/h: Liters per hour, unit

L/KM   l/km: liters per kilometer, unit

LAM   Idle emissions measurement

LAV   Luxury activity vehicles (vehicle classification, such as Lexus RX 300)

LC   Low compression, or Version with low compression ratio

LCD   Liquid crystal display, usually proper name

LCM: Left Camera Module Vänster "dödavinkel"-kamera, tillhör BLIS-systemet. (Se även BLIS och RCM)  

LDA   Boost-pressure-dependent full-load stop, with distributor injection pumps

LDF   Boost-pressure sensor

LDR   Boost-pressure control, or Idle speed control

LE2-JET   Petrol injection, LE-Jetronic, 2nd generation, usually proper name

LED   Light-emitting diode, usually proper name

LEN   LEn: Jetronic, intermittent, covers European functionality, n=version, usually proper name

LER   Idle limit-speed control

LEV   Low-emissions vehicle. Designation for vehicles with low emissions level. See also NLEV, SULEV, TLEV, ULEV, and ZEV.

LFB   Load-dependent start-of-delivery, with distributor injection pumps

LFR   Idle compensation

LFT   Air temperature sensor, or Long (term) fuel trim (to counteract aging symptoms). See also LTFT.

LHA   Air-side automatic heater

LHD   Left-hand drive

LH-JETRONIC   Same as L-Jetronic with hot-wire air-mass sensor, usually proper name

LHN   LHn: Jetronic with hot-wire air-mass sensor, intermittent, n=version, usually proper name

LI   (also li:) Left, or Load index, number indicating tyre load capacity

LIA   Lift axle

LIM   Sedan

LIN: Local Interconnect Network En billigare och enklare typ av datanät som ibland ersätter CAN när dess flexibilitet och hastighet inte behövs (Se även CAN)  

L-JETRONIC   Electronically controlled injection system (with direct air-mass measurement), usually proper name

LKE   Load piston unit

LL   Idle, engine operating state or Left-hand drive or LL division, triangular division of brake circuits: 2 circuits in front, one in rear

LLDRAN   Idle speed increase

LLK   Charge-air cooling

LLR   Idle control (diesel systems)

LLRA   LLRa: Idle control with adaptive pilot control

LLS   Idle actuator, or Idle switch

LL-STAB   Idle stabilization

LM   Air-flow sensor (also LMM)

LMF   Light-alloy rims

LMM   Air-mass sensor, or Air-flow sensor

LMS   Air-mass sensor

LN   Ln: Jetronic with air-flow sensor, intermittent, n=version, usually proper name

LOS   Emergency program (EEC IV)

LP   Perforated plate

LPG   Liquefied petroleum gas, fuel for vehicles with gas-powered engines

LPG: Liquefied Petroleum Gas Flytande naturgasbränsle. Relativt ovanligt för personbilar i Sverige.   

LPS   Circuit board circuit

LPT   Printer port or interface on PC

LR   Oxygen sensor control

LRA   LRa: oxygen sensor control with adaptive pilot control

LRD   Load response drive, alternative multifunction control

LRR   Smooth-running control, or Long-range radar (component of ACC system with detection range up to 120 m)

LRS   Load response start, alternative multifunction control

LS   Release switch or Oxygen sensor

LSCAN   Low-speed controller area network. CAN bus with low transmission rate (Opel). See also CAN, MSCAN, and HSCAN.

LSD   Limited-slip differential

LSF   Oxygen sensor, planar (flat sensor)

LSH   Oxygen sensor, heated

LSM   Oxygen sensor for lean operation

LSM: Light Switch Module Ljusväljaren som sitter till vänster om ratten på instrumentpanelen.   

LSP   Longitudinal lock shutoff

LSU   Wideband oxygen sensor, planar type

LSZ   Light-switching centre

LT   Model designation for VW Transporter, proper name

LTCC   Low temperature cofired ceramic, multilayer ceramic technology

LTF   Air-temperature sensor

LTFT   Long-term fuel trim (to counteract aging symptoms). See also LFT.

LTG   Line

LTR   Liter, physical unit, often also ltr, L

LUN   LUn: Jetronic, intermittent, with USA functionality, n=version, usually proper name

LWL   Optical fiber

LWR   Headlight vertical aim control

LWS   Steering wheel angle sensor. Component of ESP system, determines steering-wheel rotation

M   M: Motronic, usually proper name, or Mechanical or Mechanical fan or Centre m: Centre or Manual

M/S2   m/s²: meters per second per second, physical unit for acceleration

M3/H   m³/h: cubic meters per hour, unit

MA   mA: milliampere, physical unit MA: Mono-Motronic, petrol injection system, usually proper name

MAEL   MaEl: earth (ground) electrode (spark plug)

MAF   Mass airflow sensor

MAF: Mass Air Flow Sensor Luftmassemätare. Mäter mängden insugsluft och skickar värden till motorns styrenhet ECM.   

MAL   Malaysia

MAP   Manifold absolute pressure or Intake manifold pressure sensor

MAP: Manifold Absolute Pressure Lufttrycket i motorns insugskanal  

MAR   Quantity compensation control

MAS   Control unit for engine assembly

MAT   Manifold absolute temperature

MAX   Maximum

MBAR   mbar: millibar, physical unit

MBS   Engine-brake switch

MBZ   Diaphragm brake cylinder

MC   Microcomputer or Medium compression

MCC   Micro Compact Car. DaimlerChrysler subsidiary that manufactures the Smart vehicle.

MDA   Engine speed increase

MDF   Mass of wheel-speed sensor, usually with an indication of the particular sensor (left front, right front, etc.)

MDR   Membrane pressure control

ME   Motronic with electronic gas pedal, usually proper name, or Control unit for volume regulation in diesel systems, usually proper name

MEA   Middle East

MEAB   Mechanical shutoff device (diesel EDC). In newer systems, the shutoff is electrical (see ELAB).

MECH.   Mechanical

MED   Motronic with ETC and petrol direct injection

MEG   Motronic with ETC and transmission control

MEINS   Meins: Injection volume (in mg/stroke or mg/s)

MELBUS: Mitsubishi Electronics Bus Datanät som används för "infotainmentrelaterade" funktioner i P2-bilar, XC90 undantagen (se även MOST)  

MEN   Monitor engine (output line for engine diagnostic data)

MEP   Mean effective pressure

MES   Mechanically enabled start volume

MEX   Mexico

MF   Measurement window

MFA   Measurement window, start or Multifunction display

MFD   Multifunction display

MFE   Measurement window, end

MFI   Multipoint fuel injection (electronic)

MFI-C   Continuous multipoint fuel injection (electronic)

MFI-I   Intermittent multipoint fuel injection (electronic)

MFI-S   Sequential multipoint fuel injection (electronic)

MFL   Multifunction steering wheel

MFR   Multifunction control

MFS   Multifunction sensor

MFU   Multifunction clock

MG   Manual transmission

MG/H   mg/H: milligrams per stroke, unit

MG/ZYK   mg/Zykl: milligrams per cycle, unit

MGND   Engine ground (earth)

MHDI   Mechanical high-voltage distribution ignition

M-HEAT   Mirror Heating, Spiegelheizung (Opel)

MI   mi: Miles, physical unit MI: Malfunction indicator or Main injection (see also HE)

MIC   Microplex (Marelli)

MICROPLEX   Fully electronic ignition system with knock control

MID   Multifunction information display

MIEL   MiEI: Middle electrode (spark plug)

MIL   Malfunction indicator lamp

MIL: Malfunction Indicator Lamp Varningslampa som indikerar ett fel på bilen  

MIN   Minimum

MIU   Main Instrument Unit

MJ   Mono-Jetronic, usually proper name or Model year

M-JET   Mono-Jetronic, usually proper name

MK   Motronic with continuous fuel metering, usually proper name

MKV   Multiplicative map adjustment, or Fuel ratio mixture

ML   Motronic with flap air-volume sensor, usually proper name

MLA   Multiple link antitheft system (system-wide theft protection)

MLD   Mechanical load-peak damping

MLN   MLn: Motronic based on air-flow sensor, n=version, usually proper name. See also LM.

MM   mm: millimeter, physical unit

MM3/H   mm³/H: cubic millimeters per stroke, unit

MMI   Engine torque, actual value or Man-machine interface (Porsche designation)

MMM   Multipath map matching (navigation system)

MMM: MultiMedia Module Styrenhet för multimedia. Endast XC90  

MMS   Engine torque, nominal value

MMV   Quantity solenoid valve

MN   Mn: Motronic, universal load detection (HLM, LM), n=version, usually proper name

MNEFZ   Modified new European driving cycle (exhaust-gas test cycle). See also NEFZ.

MODIC   Mobile diagnosis computer (BMW diagnostic tester)

MOLIS   Modular lights system. LEDs in modular system for rear lights, for example (BMW)

MOST   Media oriented system transport. Usually in conjunction with a bus system (MOST bus), via which various control units in the vehicle communicate with each other.

MOST: Media Oriented System Transport Optiskt datanät som används för "infotainmentrelaterade" funktioner i XC90 (se även MELBUS)  

MOT   Engine tester, product name (Bosch) or Engine test

MOT/DME   Digital Motor Electronics (Motronic)

MOZ   Engine octane number. Expresses the knock resistance of petrol fuel (US variant of ROZ).

MP   Motronic with intake manifold sensor, usually proper name

MP1: Media Player 1 Styrenhet för Mini Disc-spelare  

MP2 Media Player 2 Styrenhet för CD-spelare  

MPA   MPa: megapascal, physical unit

MPFI   Multi-point fuel injection, electronic, usually proper name

MPH   mph: Miles per hour, physical unit

MPI   Multi-point injection, fully electronic engine control, usually proper name

MPN   MPn: Motronic in which load detection is via intake manifold pressure, n=version, usually proper name

MPV   Multi-purpose vehicles (Mazda). Comprises the group of vans and small panel trucks.

MR   Engine relay or Engine control for ASR

MR-DF   Speed sensor with magnetoresistive measurement

MRS   Multi-restraint system. Temic or BMW system consisting of belt tensioner, belt force limiting, airbags, and safety battery terminal (see SBK).

MS   ms: millisecond, physical unit MS: Engine control or Diesel systems with electronic volume- and start-of-injection control

MSA   Designation for diesel injection systems having an electronic volume control, start-of-injection control, and exhaust-gas recirculation. Systems without exhaust-gas recirculation are designated simply as MS.

MSCAN   Medium-speed controller area network. CAN bus with medium transmission rate (Opel). See also CAN, LSCAN, and HSCAN.

MSG   Engine control unit

MSR   Engine drag torque control, usually proper name

MST   Measurement and control unit

MSTS   Microprocessor spark timing system, electronic ignition with map control (ELZ), or Multi spark timing system, function as for EST. MSTS, however, is not an integrated part but rather a separate ignition control unit

MT   Manual transmission or Mechanical transmission or Volume divider

MTCO   Tachograph

MTM   Engine measurement technology module

MUD   mUD: With vacuum

MUX   Multiplexer or multiplex signal

MUXPORT   Multiplexer-Port, Schnittstelle am PC, an die der Multiplexer angeschlossen ist oder angeschlossen werden kann

MV   mV: millivolt, physical unit MV: Solenoid valve

MW   AM (radio), or Measurement

MVEG   Motor vehicle emission group, exhaust-gas classification for passenger cars

MVL   Lift axle valve with electronic air-cushioning system

MVLDR   Solenoid valve for boost pressure control

MVN   Level valve with electronic air-cushioning system

MVS   Solenoid valve control unit

MY   Model year

MZ   Magneto ignition

MZV   Microprocessor-controlled ignition adjustment

N   n: RPM, or normal N: Selector-lever position (Neutral) for automatic transmissions, or Norway

NA   Auxiliary drive or Netherlands Antilles

NAS   Auxiliary drive switch

NAV   Navigation or Navigation system

NB   Commercial-vehicle brake

NBE   Proximity detector

NBF   Needle lift sensor (diesel)

NBS   Needle lift sensor (diesel)

NCAP   New Car Assessment Program, better known as EURO-NCAP, association for conducting more demanding crash tests (with participation of vehicle manufacturers)

NDS   Neutral drive switch, activated when automatic transmission selector lever is in neutral position

NE   NE: After-injection Ne-Signal: Engine RPM signal, 24 AC signals sent to control unit per distributor rotation

NEDC   New European driving cycle (procedure for fuel consumption measurement). See also NEFZ

NEFZ   New European driving cycle (procedure for fuel consumption measurement). See also NEDC

NF   Low frequency, or audio frequency

NFZ   Commercial vehicle (lorry, truck)

NHG   Needle-displacement sensor (diesel systems)

NHU   Navigation head unit. Opel navigation control unit.

NIC   Nicaragua

NKW   Lorry (truck)

NKW-ABS   Anti-blocking system for lorries (trucks) with air brakes

NL   Netherlands

NLEV   National low-emission vehicles. US approval level for vehicles that must fulfil the current requirements. See also LEV, SULEV, TLEV, ULEV, and ZEV.

NLK   Follow-on piston

NLS   Needle lift sensor (diesel)

NM   Nm: Newton-meter, physical unit

NM/S   Nm/s: newton-meters per second, unit

NMOT   Nmot: Engine RPM

NOE   Nitrogen oxide emission

NOX   NOx: Nitrogen oxides

NPB   Delivery volume normal test stand (special tester for injection pumps)

NR   Number, or Level control, or Natural rubber (often processed for use in truck tyres).

NRZ   NRZ format: Non-return-to-zero, transmission or pulse form for square-wave pulses and signals

NS   Fog light(s)

NSW   Fog lights

NTC   Negative temperature coefficient, thermal resistor with negative temperature coefficient, so-called hot conductor

NTC II   Idle speed increase

NTC1   Intake air temperature (in °C)

NTC2   Engine water temperature (in °C)

NW   Camshaft

NVF   Navigation and traffic control

NWS   Camshaft timing

NZ   New Zealand

O2   Oxygen

OAI   Octane adjust input

OBD   On-board diagnostics or off-board diagnostics, vehicle-internal diagnosis with internal or external test unit, usually proper name

OBD: On Board Diagnostic System Bilens inbyggda feldiagnossystem som lagrar felkoder. (Se DTC)  

OBF   Upper control panel. Above or on the dashboard, some vehicles have switches or buttons, such as for the rear-window defogger. These elements together comprise a control panel, which is referred to as the upper control panel to distinguish it from another control panel near the gearshift lever or below the radio.

OBM   On-board measurement

OC   Oxidation catalytic converter

ODFT   Sensor for oil pressure and temperature

ODS   Automatic overdrive control

OEDS   Oil pressure switch

OEF   Location of missing vehicles (via GPS)

OEM   Original equipment manufacturer

OES   Original equipment service. Service or spare parts via the vehicle manufacturer.

OFFSET-V   Voltage offset

OG   Upper limit or Upper tolerance limit

OHC   Overhead camshaft. Camshaft situated above the cylinder head. Often used in engine designations.

OHV   Overhead valves (the camshaft is therefore underneath)

OMM   Surface micromechanics

OOP   Out-of-position detection

OP   Oil pump

OPC   Opel Performance Centre. Centre for automotive sports (Opel).

OR   Logical OR operation

OSRVM   Outside rear-view mirror (Opel)

OT   Top dead centre

OTA   Oxygen/titanium emissions sensor. Titanium oxide sensor. See also OZA.

OTF   Oil temperature sensor

OUD   OUD: Without vacuum

OUT   Designation on diesel pump for excess-flow restriction screw

OWS: Occupant Weight Sensor Viktsensor i pass.stolen som avgör om pass.krockkudden skall utlösas. Troligen endast på den nordamerikanska marknaden  

OZ   Octane rating. See also ROZ.

OZA   Oxygen/zirconium emissions sensor. Zirconium oxide sensor. See also OTA.

P   Pressure, or Power train (used with OBD error codes, for example), or Portugal

PA   Pa: pascal, physical unit of pressure. See also HPA, KPA, and MPA. PA: Parking assistant

PACOS: Passenger Airbag Cut Off Switch Omkopplare för avaktivering av passagerarkrockkudde  

PAG   Polyethylene glycol oil, low-temperature oil

PAM   Parking assistant module (Opel)

PAM: Parking Assistance Module Parkeringsassistans (Backvarnare se även PDC)  

PANS   Pans: Intake air pressure (in hPa)

PAS   Peripheral airbag sensor (side airbag)

PASE   Passive start and entry. Keyless access to car and engine start (Siemens system). Also called Keyless Go (Mercedes, for example)

PATA   Passive button. Button in vehicle with which a function can be set to the passive (off) state

PATS   Passive antitheft system

PB   Pb: chemical symbol for lead (Latin: plumbum)

PBM   Pulse width modulated, signal processing method (prior to sending), usually proper name

PBSL   Park brake shift lock. Selector lever lock for automatic transmission (Opel)

PC   Power control or Personal computer

PCM   Power train control module or Porsche Communication Management, central multimedia control unit for various functions

PCU   Pump control unit (diesel systems), or Power control unit, hybrid-drive control (Honda)

PCV   Positive crankcase ventilation, closed crankshaft ventilation

PD   Pump-nozzle

PDAS   Dynamic 4-wheel control, usually proper name

PDC   Park distance control. Parking aid, often proper name, or Pre-drive check (testing of EHB systems)

PDC: Parking Distance Controll Parkeringsassistans (Backvarnare se även PAM)   

PDE   Pump-nozzle unit (new designation is UIS)

PDM   Passenger door module (Opel)

PDM: Passenger Door Module Kontrollpanelen på passagerarens dörr med fönsterhissknappar. (Se även DDM)   

PDOE   Nozzle opening pressure

PEHKS   Pedestrian protection hood kinematics system. Ford mechanical system that raises the hood (bonnet) in the case of an impact (such as hitting a pedestrian). See also POBSY.

PES   Polyellipsoid system (headlight technique)

PES-SW   Polyellipsoid headlight(s)

PFA   Particle filter system

PFI   Port fuel injection, inlet-channel injection

P-FP   p-FP: Delivery pump pressure.

PG   Phase sensor

PH   Pressure high, high pressure

PHI   phi: Greek letter used to designate angles.

PHM: Phone Module Den inbyggda telefonen.   

PHS   Park heater system

PI   Pilot injection. See also POI, MI, and HE.

PID   Parameter identifier, part of CARB, code for current values or similar parameters, usually proper name

P-IN   p-in: Delivery pressure

PIP   Profile ignition pickup, ignition output circuit (Ford) or Signal of Hall sensor for crankshaft RPM and position

PJ   Pilot-Jection

PKW   Passenger car

PL   Country code for Poland, or Pressure low, low pressure

PLA   Pneumatic idle increase or Pneumatic idle stop

PLD   Pump-line-nozzle, diesel injection technique (new designation is UPS)

PLR   Pneumatic idle speed control

PLU   Pierburg measurement cell, or Pierburg Aviation

PM   Pump motor

PML   Parametric steering, assisted vehicle steering. The related data (parameters) are stored in the control unit.

PMR   Private mobile radio

PMS   Engine control with load detection via intake-manifold pressure (Mercedes) or Inlet-channel injection

PNAB   Pneumatic adjustment device

PNABU   Pneumatic adjustment device, vacuum-operated (Bosch KH)

PNABUE   Pneumatic adjustment device, pressure-operated (Bosch KH)

PNG   Papua New Guinea

POBSY   Pedestrian protection optimised bumper system. Ford bumper system made from energy-absorbing foam plastics to protect pedestrians.

POI   Post-injection. See also PI, MI, and HE.

POTI   Potentiometer, variable resistance

PPG   PPG module: Periphery program module; module containing control unit diagnostic programs or other CompacSoft programs, proper name

PPM   ppm: parts-per-million, unit

PPS   Pedal position system, or Pedal position sensor

PRC   People's Republic of China

PRG   Program

PROG   Programming input

PROM   Programmable read-only memory, usually proper name

PRS   Programmed restraint system. Reduces the seat-belt tension and thus upper-body injuries (Renault)

PS   Test step or Pump control or Horsepower, unit of work performed by motor vehicles

PSA   PEUGEOT SOCIETE AUTOMOBILE, proper name

PSD   Pump control with diagnosis or Porsche limited-slip differential, usually proper name

PSE   Pneumatic system electronics, electronically controlled pneumatic system

PSG   Pump control unit

PSI   psi: Pounds per square inch, physical unit

PSM   Porsche Stability Module. Porsche-specific designation for ESP.

PSM: Power Seat Module Den enhet som styr en elstol  

PSP   Power steering pressure

PSPS   Power steering pressure switch

PSV   Partial intake-manifold pre-heating

PT   Power train

PTC   Positive temperature coefficient, thermal resistor with positive temperature coefficient, so-called cold conductor, or PTC heating element in intake manifold for delivering heat for evaporation

PT-CAN   Power train CAN bus. High-speed CAN bus for drive-train electronics. See also K-CAN, SI-BUS.

PTS   Park-Tronic System. Parking aid. See also PDC.

PV   Testing instruction

PWG   Pedal position sensor, usually proper name

PWL   Power window lifter

PWM   Pulse-width modulation, special signalling form used to determine pulse-duty factors on components (for example, triggering of tank ventilation valve is usually based on such a factor)

PWR   Pulse rectifier

PVS   Vacuum switch

PY   Paraguay

Q   Quantity, usually of fuel

Q1   Fuel quantity for cylinder 1. Similarly Q2, Q3, etc.

Q-AVG   Quantity average. Mean of (fuel) quantity of all cylinders

QB   Quality assessment

QGS   Quick glow system. Rapid pre-heating system for diesel engines.

QHS   Quick heat system. Rapid diesel pre-heating system.

QM   Quality management

Q-OVER   Q-over: Overflow quantity

QS   Quality assurance

QSF   Average function

QSL   Quasi select low

QUADR   Quadrifoglio, Alfa Romeo model designation

RA   Rear axle, or Argentina

RAIL   Common Rail, high-pressure distribution line with Common Rail diesel systems

RAM   Random access memory, read/write memory of a processor

RAS   Rear-axle steering. Actively steered rear axle used in buses, for example.

RB   Robert Bosch

RC   Remote control, or China (Taiwan)

RCA   Republic of Central Africa

RCH   Chile

RCM: Right Camera Module Höger "dödavinkel"-kamera, tillhör BLIS-systemet. (Se även BLIS och LCM)  

RDK   Tire pressure check system, usually proper name

RDS   Rail pressure sensor or Radio data system

RDU   Tyre pressure monitoring

RDV   Reverse-flow throttle valve

RDW   Rest of the world (group in exhaust-gas classification)

RE   Right (often "re") or Inline injection pump

REA   Resonance detection

REC   Rear electrical centre (Opel)

REL   Relay

REM: Rear Electronic Module Bakre elcentralen med säkringar, reläer och strömförsörjning till diverse elförbrukare. Placerad i vänstra delen av bagageutrymmet.  

RF   Radio frequency, radio signal

RFP   Return pump

RFS   Backup light(s)

RFT   Run-flat tyre. Special tyre that can also be used in an emergency.

RG   Route guidance (Travel Pilot)

RGS   Route guidance standalone (Travel Pilot as standalone system)

RHD   Right-hand drive

RHO   rho: Greek letter, represents density (kg/m³)

RHV   Static high-voltage distribution

RI   Indonesia

RIV   Control pulse method (diesel)

RKS   Tire check system

RL   Right-hand drive

RLDM   Rear Left Door Module

RLFS   Fuel supply system without reverse flow

RLV   Reverse-flow valve

RM   Reference mark

RME   Rapeseed methyl ester, alternative fuel

RO   Romania

ROK   Republic of Korea

ROM   Read-only memory. Program memory of processor, or other memory, that can only be read.

RON   Research octane number, see also ROZ

ROPS   Rollover protection system. Automatically extendable rollbar (Volvo)

ROPS: Roll Over Protection System Volvos skyddsystem mot/vid voltning  

ROV   Rotating high-voltage distribution

ROZ   Research octane number

RP   In-line pump, or Philippines

RPA   Flat tyre indicator

RPM   Revolutions per minute

RRDM   Rear Right Door Module

RS   Restraint system or Rotational speed sensor

RSC   Run-flat system component. Tyres with emergency-running properties. See also RFT.

RSD   Backflow throttle

RSE: Rear Seat Entertainment System System för att förse baksätespassagerarna med audiovisuell underhållning (DVD, datorspel etc.)  

RSM: Rain Sensor Module Enhet för automatisk styrning av vindrutetorkaren på en bil med regnsensor  

RSV   Check valve, prevents undesired reverse-flow of liquids or gases

RTI   Radio Traffic Information, Verkehrfunk

RTI: Road Traffic Information System/Module Volvos navigationssystem respektive den elektroniska enhet som styr navigationssystemet  

RTM   Smoke opacity measurement module, product name for exhaust-gas tester (Bosch)

RTR   Reverse-flow temperature control

RU   Soot concentration in exhaust

RUE   Soot emission

RUEF   Retrofit vehicle

RUM   Soot amount

RUV   Static high-voltage distribution, usually proper name

RW   Control travel

RWAWS   Control-travel evaluation circuit

RWD   Rear wheel drive

RWG   Control-travel sensor

RX   Receive line (contrast with TX line).

RZ   Wheel brake cylinder

S   S: Sensor, or super (premium) grade fuel, or sport program (automatic transmission), or Sweden s: seconds

SAC   Self-adjusting clutch. Transmits only the current engine torque

SACV   Secondary air control valve

SAE   Society of Automotive Engineers, US organization that prescribes standards, recommendations, or guidelines for technically implementing legal requirements (such as for engine oil, error codes, data transmission, etc.)

SAM   Safety (or signal detection) and triggering module. Designation for Mercedes control unit.

SAS   Side-impact protection

SAS: Steering Angle Sensor Styrvinkelsensor (för DSTC)  

SAT   Siemens adaptive transmission control

SAV   Overrun cutoff valve, or Sport activity vehicles (for example BMW X5)

SB   Star-of-injection, indicates when fuel injection actually starts (the start-of-delivery on the other hand is the time at which the fuel pump begins to deliver), or Control unit for start-of-injection control (diesel)

SBB   Disc-brake lining

SBC   Sensotronic Brake Control, part of EHB (electrohydraulic brake) system

SBE   Seat-occupied detection

SBK   Safety battery terminal. Part of airbag system. In the case of an accident, the battery is rapidly disconnected from the starter cable in order to prevent short circuits and reduce the risk of fire.

SBR   Start-of-injection control

SBS   Speech-based operation system (Porsche designation)

SC: Spin Control Volvos beteckning på ett antispinnsystem som arbetar vid högre hastighet genom vridmomentsänkning. Ingår i STC. Ungefär samma sak som DSA.  

SCAN TOOL   Tester for reading OBD error codes and other OBD data

SCC   Safety car concept. Volvo concept for vehicle in which many safety features have been integrated

SCHALT   Switch

SCHR   Steps, such as with a stepping motor

SCI   Smart-charged injection. Petrol direct injection (Ford)

SCL   Steering Column Lock

SCL: Steering Column Lock Module Rattlåsenhet  

SCM: Siren Control Module Styrenhet för larm  

SCP   Serial communication protocol, proper name

SCS   Stability control system. Simplified form of ESP (Mitsubishi). Prevents vehicle tilting or skidding.

SCU   Sensor and control unit. Control unit with integrated radar sensor, main component of ACC system.

SCU Start Control Unit: Tändningslåsenhet  

SD   Intake manifold pressure, or Sunroof, or Injection duration, or Control unit diagnosis

SDARS: Satelite Digital Audio Radio Service Ett satelitbaserat system för radioutsändningar. Finns ej i Sverige  

SDI   Intake diesel injection

SDL   Service diagnosis line, product designation for test line (Bosch)

SDM   Sunroof motor or Control unit diagnosis module

SDM   Sensing and Diagnostic Module (airbag)

SDS   Intake-manifold pressure sensor

SDW   Signal from anti-theft warning system

SEC   Seconds, physical unit

SEFI   Sequential fuel injection, usually proper name

SELECT HIGH   Select-high control for commercial-vehicle ABS systems. The pressure level is geared to the wheel running with the higher coefficient of friction.

SELECT LOW   Select-low control with commercial-vehicle ABS systems. Pressure level depends on wheel running with the lower coefficient of friction

SET CONTROLLER   Program command related to controller

SFI   Sequential multipoint fuel injection

SFT   Short (term) fuel trim (lambda-parameter correction). See also STFT.

SG   Control unit

SGP   Singapore

SHD   Sliding or lifting sunroof

SHR   Select-high control for commercial-vehicle ABS systems. The pressure level is geared to the wheel running with the higher coefficient of friction.

SHZ   Heated seat

SI   Speed index (code letter for speed), or Silicon

SIA   Service interval indicator. Shows the driver that oil change or annual inspection is required, for example. See also WIV.

SI-BUS   Safety and information bus system. See also K-CAN and PT-CAN.

SID   System Information Display

SIDC   Sid Controller

SIH   Sitzheizung

SIL   Seat electrical system, left

SILA   Signal lamp

SIM   Safety information module. Component of ISIS system (BMW)

SIPS   Side-impact protection system (Volvo)

SIPS: Side Impact Protection System Volvos system för sidokrockskydd  

SIR   Seat electrical system, right.

SIS   Service Information System, proper name or Series repair

SKF   Spike characteristic. Relates to Porsche transmission controls.

SKO   Compressor signal

SKT   Scale units

SL   Select low

SLA   Safety lamp

SLE   Secondary-air injection

SLM   Shift lever Module

SLO   Slovenia

SLP   Secondary-air pump

SLR   Select-low control for commercial-vehicle ABS systems. The pressure level is geared to the wheel running with the lower coefficient of friction.

SLS   Secondary-air system

SM   Seat memory, or Stepping motor

SME   Stepping-motor electronics

SNA   Automatic momentum utilisation

SNR   Part number or Record number

SO   Safety switch, normally closed (actuator)

SO2   Sulphur dioxide. Pungent gas causing respiratory diseases. It is thus an aim to reduce the sulphur content in exhaust gases.

SOHC   Single overhead camshaft

SOP   Start of production

SP   Safety testing, usually in conjunction with testing of brake system

SPA   Mirror drive

SPA   Sonic Park Assist

SPI   Single point injection, usually proper name

SPL   Noise level, or Sound-pressure level

SPM   Mirror memory, usually proper name

SPOR   Sporadic

SPOUT   Ignition signal (EEC IV)

SPS   Solar position sensor

SPV   Injection adjustment (see also SV)

SR   Side-based control

SRA   Headlight wiper system

SRC   Source (of data or audio signals, for example)

SRE   Intake-manifold injection

SRI: Service Reminder Indicator Påminnelsen i DIM för att det är dags för service. (Se SRL)  

SRL: Service Reminder Lamp Påminnelsen i DIM för att det är dags för service. (Se SRI)  

SRM   Headlight wiper motor

SRM   Sun Roof Module

SRS   Safety restraint system (generally includes airbag and seatbelt tensioner, normally controlled by a common control unit)

SRS: Supplemental Restraint System Krockkuddesystemet. Även den enhet som styr krockskyddet (krockkuddar, bältessträckare, bälteskraftsbegränsare m.m.)  

SS   Safety switch, normally open (sensor 9)

SSA   Automatic start/stop

SSD   Steel sliding sunroof

SSG   Seat control unit (Mercedes)

SSHD   Steel sliding/lifting sunroof

SSS   Stop/start system

SST   Special tool or self-supporting tyre, tyre which supports itself and features limp-home properties

SSU   Triggering device for side airbag

ST   System tester

STAE   Start external, external start switch

STAT   Static

STC   Stability and traction control

STC: Stabillity and Traction Control Volvos antispinnsystem. Finns som självständigt system men utgör också en del av DSTC.  

STFT   Short-term fuel trim (for lambda-parameter correction). See also SFT.

STH   Stationary-vehicle heater

STI   Self-test input signal

STM   Servomotor

STO   Self-test output signal

STOE   Stop external, external stop switch

SU   Soviet Union

SUB: Subwoofer Djupbashögtalare, ofta placerad i bagageutrymmet. Även beteckning på styrenhet till sådan högtalare  

SULEV   Super ultra-low emissions vehicle (group in classifying exhaust-emissions levels). See also LEV, NLEV, ULEV, TLEV, and ZEV.

SUM: Suspension Module Styrenhet för Four-C  

SUS   Slip threshold switchover

SUV   Sport utility vehicles. Vehicle group comprising off-road-capable, leisure-activity sport vehicles and commercial vehicles with all-wheel drive (fun vehicles). Better suited for on-road than off-road. Examples: Mazda Tribute, Mercedes ML 320.

SV   Injection adjustment (see also SPV) or Servo valve or Start valve

SW   Headlight(s) or Software

SWA   Headlight washer

SVC   Saab variable compression. The cylinder head is tilted in order to modify the compression ratio, or Speed volume control. Speed-dependent volume control for car radios.

SWC   Steering Wheel Control

SWD   Vibration damper

SVG   Seat adjustment transmission

SVM   Seat adjustment motor

SWM: Steering Wheel Module Enhet som vidareförmedlar de inställningar som görs med hjälp av reglagen kring ratten.  

SWT   Side wall torsion sensor. Detects longitudinal and transverse forces directly at the wheel during acceleration, braking, and in curves. Currently employed for quick-reaction ABS and ESP systems, in the future possibly for counteracting wind gusts.

SZ   Opacity number, or Coil ignition, possibly with interrupt contacts or Switching-time program (determines switching time)

T   t: (such as t-adj., time of adjustment) T: temperature (such as T-comp, compression temperature)

T.C.S.   Ignition timing control system

T.O.C.S.   Throttle valve control system

TA   Traffic announcement, or Thorax airbag (BMW)

TAB   Test Airbag. Excitation lead for airbag system (Mazda)

T-ABGLEICH   t-adjust: time of adjustment

TAC   Test Air Conditioning. Excitation lead for air conditioner (Mazda)

TANS   Tans: Intake air temperature (in °C)

TAS   Temperature dependent control, with distributor injection pumps, or Temperature dependent start-volume, with distributor injection pumps

TAT   Test Automatic Transmission. Excitation lead for transmission control (Mazda)

TAU   Automatic temperature system

TBB   Drum-brake shoes

TBI   Throttle body injection, central injection

TBS   Test Brake System. Excitation lead for ABS system (Mazda)

TC   Traction control, auxiliary function with ABS

TC: Traction Control Volvos beteckning på ett antispinnsystem som fungerar vid låg hastighet med hjälp av ABS-systemet. Ingår i STC. Ungefär samma sak som TRACS.  

TC: Turbo Charger Turbo  

TCE   Trailer central electronic, central electronics system for trailer

TCM   Transmission control module (Opel automatic-transmission control unit)

TCM: Transmission Control Module Styrenhet för automatlåda  

TCO   Tachograph (Mercedes)

T-COMP   T-comp: Compression temperature

TCS   Traffic centre service

TCSA   Temperature controlled spark advance

TCU   Transmission control unit

TD   TD: Time division, engine load signal tD: Transistor speed signal, square-wave signal supplying RPM for other systems such as transmission control

TDC   Top dead centre, see also OT

TDI   Turbo diesel injection

TDS   Tank pressure sensor

TEC   Total electronic control

TEE   Tank installation unit

T-EIN   t-ein: Build-up time

TELE-AID   Telematic alarm identification on demand, accident notification

TEMP   Temperature

TEMP. SCH.   Temperature switch

TEMPF   Temperature sensor

TEN   Test Engine. Excitation lead for control unit (Mazda), usually proper name

TES   Thermo-electric switch or tank ventilation system (also referred to as evaporative emission-control regeneration system)

TEV   Tank ventilation valve or Thermostatic expansion valve (heating/air conditioning)

TF   Temperature sensor

TFA   Test of radiator fan

TFI   Electronic ignition switch (EEC)

THA   Thailand

THS   Toyota hybrid system. Hybrid of combustion and electrical drive, with electronic control.

T-HYBRID   Hybrid temperature

THZ   Tandem master cylinder. Master brake cylinder for hydraulic brakes.

TI   ti: Injection signal (t=time, i=ignition)

TID   Test identification data or Triple Info Display, driver information system in which certain data and information is displayed

TIM   Time impulse

T-IN   T-in: Inflow temperature (actual) T-in (nom.): Nominal inflow temperature

TIPTRONIC   Porsche or VW electronic transmission control. The control can be operated via a small device on the steering wheel.

TKRAFT   Fuel temperature (in °C)

TKU   Technical customer documentation

TL   tl: Engine load signal recorded over time TL: Partial throttle, engine operating state

TLA   Temperature dependent idle increase, with distributor injection pumps

T-LASTPUNKT   Time of load point

TLEV   Transient low-emissions vehicle (group in exhaust-emissions classification). Comprises vehicles with low emissions levels. See also LEV, NLEV, SULEV, ULEV, and ZEV.

TLK   Temperature dependent idle correction

TMAP: Temperature and Manifold Absolute Pressure Sensor Givare för laddluftkylares temperatur och tryck  

TMB   Door module, passenger side

TMC   Traffic message channel

TMC: Traffic Message Channel Module Enhet i RTI-systemet som avlyssnar TMC (Traffic Message Channel)  

T-MESS   Time or duration of measurement

TMF   Door module, driver side

TMOT   Engine temperature (in °C), usually determined from coolant

TMS   Telematics

TMS   Telematic system

TN   tn: Signal from ignition with inductive peaks suppressed. Used for RPM detection for control unit and speedometer

TNA   Signal output for engine speed.

T-OFFSET   Time offset

T-OVER   T-over: Overflow temperature

TP   Throttle valve potentiometer (actuator)

TPM   Tempomat (cruise control)

TPM   Tyre Pressure Monitoring

TPMS   Tyre pressure monitoring system, with pressure and temperature sensors at wheel (Opel/Teves)

TPS   Throttle position sensor

TQ   Time quantity (usually TQ signal). Fuel consumption signal.

TR   TR: RPM information, or contact roller, or Turkey tr: Calculated RPM signal

TRACS   Traction control system (Volvo)

TRACS: Traction Control System Volvos beteckning på ett antispinnsystem som fungerar vid låg hastighet med hjälp av ABS-systemet. Ingår i STC.  

TRM: Trailer Module Styrenhet för strömförsörjningen till släpvagn  

TRUST   Trundle stability

TS   Temperature switch or Twin spark, double-spark ignition (Alfa Romeo)

TSG   Tank level sensor or Door control unit

TSH   Door lock heater

TSP   Trailer stability program, ESP type system for trailers, designed to prevent trailer skid (Opel)

TSS   Thermal protection switch

TSU   Speedometer signal transformer

TSZ   Transistor coil ignition with discrete components

TSZ-H   Transistor coil ignition with Hall sensor

TSZ-I   Transistor coil ignition with inductive sensor

TSZ-IZA   Transistor ignition with ignition coil in distributor

TT   TT division. Black-and-white division of brake circuits: one circuit in front, one in rear.

T-TOTAL   t-total: Total measurement time

TUEV   German vehicle-inspection authority

TV   TV: Timing valve tv: Offset time of oxygen sensor control

TVA   Temperature dependent full-load stop

TWA   Twin-wheel axle. Axle with twin tires on each side.

T-WAIT   t-wait: Wait time

T-WARTE   Wait time

TWC   Three-way catalytic converter

TWC: Three-way Catalytic Converter Trevägskatalysator  

T-VIS   Toyota variable intake system (cut-in at 4500 rpm in 16-valve engines)

TVS   Temperature dependent vacuum switch or Thermal vacuum switch

TVSV   Temperature dependent vacuum switching valve

TX   TX line: Transmission line, in contrast to RX line

TXV: Termostatic eXpansion Valve Tryckventil till AC-systemet som reglerar flödet med kylmedium till Evaporatorn  

TZ   Transistor coil ignition with hybrid component

TZ-H   Transistor ignition with Hall sensor

TZ-I   Transistor ignition with inductive sensor

TZS   Thermal time switch

U   Below, underneath or Voltage

UAE   United Arab Emirates

UAM   Ultrasonic Alarm Module

UB   Battery voltage, supply voltage at terminal 30

U-BATT   Battery voltage

UBF   Lower control panel. Near the gearshift lever or below the radio, some vehicles have switches or buttons, such as for the rear-window defogger. These elements together comprise a control panel, which is referred to as the lower control panel to distinguish it from another control panel on or above the dashboard.

UBL   Brake-light voltage

UCL   Understeering control logic. ESP system used in Renault Megane.

UDB   Vacuum limiter

UD-F   Vacuum adjustment EARLY

UD-MODUL   Vacuum module. Valve for switching and measuring intake manifold pressure

UDS   Accident data memory (VDO), similar to black box in aircraft

UD-S   Vacuum adjustment LATE

UEC   Underhood Electrical Center, Opel designation for engine-compartment electronics module

UEDS   Excessive-speed switch

UEGO   Universal exhaust gas oxygen sensor, non-heated Lambda sensor

UEM: Upper Electronic Module Övre elcentral integrerad i innerbackspegeln  

UERB   Rollbar

UEV   Excessive-flow valve

UG   Lower limit Lower tolerance limit

UHC   Unité Centrale d'Habitaclé (Cabin Central Processor)

UIS   Unit injection system, new designation for PDE systems (diesel injection systems with pump-nozzle unit)

U-KAT   Unregulated catalytic converter (without oxygen sensor control)

ULEV   Ultra-low emissions vehicle (group in exhaust-gas classification). See also LEV, NLEV, SULEV, TLEV, and ZEV.

ULW   Ultra lightweight

UM   Reversing valve (for ASR operation)

UMTS   Universal Mobile Telecommunications System. Standard for the 3rd generation of mobile radio communications. Is to replace the analogue radio system over the long term.

UNI1   UNI2,Additional lines on universal adapter cable, used to read out flash codes or for special purposes

UP   Unsaturated polyester. Thermosetting plastic used in body construction or to manufacture pressure-resistant containers.

UPA   Ultrasonic parking assistant

UPS   Unit Pump System, new designation for PLD systems

URS   Rollover sensor, usually proper name

US   Designation denoting basis on U.S. emission standards

USA   United States of America

USB   Universal serial bus. The USB interface permits simple connection of various peripherals to a PC.

USG   Non-interrupting manual transmission. Two clutches (drive-off and load-shift) enable electronically controlled driving without shifting interruptions.

USV   Change-over valve

UT   Bottom dead centre

UUV   Urban Utility Vehicle, Nutzfahrzeug für den Einsatz in der Stadt

UV   Ultraviolet. Used mostly in conjunction with light or radiation.

UW   Voltage converter

UVR   Voltage at valve relay

UVS   Rollbar and variable sunroof control (Mercedes)

UZ   Voltage after ignition, terminal 15

V   V: Volt, physical unit, or carburetor engine, or valve, or viscose, or fan, or front v: Front, or velocity

W/M2   W/m². Watts per square meter. Physical unit for solar radiation intensity

V/MS   V/ms: volts per millisecond, unit for voltage per time.

VA   Vorderachse

WAA   Wiper blade

VAC   Variant coding

VADIS: Volvo Aftersales Diagnostic Information System Dataprogram som användes tidigare för felsökning och vid reparationer. (Se även VIDA)  

VAF   Air-flow sensor

VAG   Volkswagen AG, vehicle maker, proper name

VAKU-SCH.   Vacuum switch

WALA   Safety lamp

VAN   Vehicle Area Network. The VAN bus is a bus system that interconnects various components in the vehicle. This can be a CAN bus, but it can also be another type of bus.

WAN   Nigeria

VANOS   Variable camshaft timing

VARILIS   Variable lighting system (Hella)

VAT   Intake-air temperature sensor

VC   Variant coding

VCV   Vacuum control valve

VD   Choke valve

VDC   Vehicle distance control or Vehicle dynamics control

WDS   World diagnostic system (Ford tester)

VDV   Vacuum delay valve

VE   Distributor injection pump (series designation). See also VP

WE   Water injection

WEBER   Weber petrol injection

WEO   Western Europe except Germany

VERD.   Verdeck (Cabrio)

VES   Fully electronic radio ignition key

VEZ   Fully electronic ignition system

VFD   Vacuum fluorescence display

VFR   Variable focus reflector (headlight)

WFS   Immobilizer

VGWX   Preset value if sensor fails

WHA   Water-side automatic heater

WHIPS: Whiplash Protection System Volvos aktiva system mot whiplashskador  

VIDA: Vehicle Information and Diagnostics for Aftersales Nuvarande dataprogram för felsökning och vid reparationer. Internetbaserat. (Se även VADIS)  

WIG   Wiper pulse transmitter

VIM   Vehicle immobilizer

VIN   Vehicle identification number, code stored in control unit

VIS   Variable Intake System (Rover)

WIV   Service interval extension. Under certain conditions (use of special oils, etc.), service can be performed at greater intervals. Also referred to as Longlife Service (VW, Audi).

VK   Valve body

WK   Converter clutch

VKP   Programmable variant coding

VKS   Variant coding with plug

VL   Left front, or Full load, engine operating state

WL   Warning lamp

VLP   Preliminary charge pump

WLR   Warmup control

VM   Adjustment motor or Combustion engine

WMM: Wiper Motor Module Styrenhet för vindrutetorkare  

VNT: Variable Nozzle Turbo Turbo med variabelt munstycke.  

VOC: Volvo On Call Säkerhetssystem som automatiskt larmar vid olycka. Finns endast tillsammans med inbyggda telefonen.  

VOCS   Voice control system

VP   Distributor pump (usually factory-internal designation). See also VE

VPC   Volvo Personal Communicator. SCC element with fingerprint sensor that detects the identity of the driver and makes driver-specific adjustments.

VR   Right front or Distributor pump with radial piston

WR   Warmup control or Warning lamp relay

VRD   Vario nozzle, nozzle with variable radius

WRG: Water Repellant Glass Vattenavvisande glas (på ytterbackspeglar och främre sidorutor)  

VRM   Valve feedback

VRS   Relay supply voltage

WS   Wiper or Travel sensor

VSA   Vehicle stability assist. System similar to ESP.

WSA   Wiper system

VSC   Voltage supply control. Battery management system (Mercedes)

VSG   Composite safety glass

WSG   Separate control unit

WSH   Wiper lever

WSK   Converter clutch used in semiautomatic transmission

WSKS   Converter clutch switch

WSM   Wiper motor

VSO   Vehicle speed out

VSS   Volts peak-to-peak, unit for special voltage values, measures difference between maximum and minimum voltage levels or Vehicle speed sensor, or Vehicle security systems

WSS   Window screen system. A type of night-vision unit (DaimlerChrysler). Supports driver in night driving by making an infrared image of what is visible through the windscreen and displaying it on a separate screen.

VSS: Vehicle Speed Sensor Hastighetssensor.  

VSV   Vacuum switching valve

WSZ   AC ignition

VT   Vacuum transducer

WT   Heat exchanger

WTF   Water temperature sensor

VTG   Variable turbine geometry. The turbine has movable guide blades, which can be varied depending on the operating state of the vehicle. A turbocharger with variable turbine geometry offers the advantage that it is more responsive than a conventional turbocharger with fixed turbine geometry.

VTV   Vacuum transmitting valve

WUEK   Eigentlich WÜK, Wandlerüberbrückungskupplung, verhindert Schlupf im Drehmomentwandler

VW   Compensating resistor or Volkswagen, vehicle maker, proper name

VVA   Variable valve actuation. Variable valve control between cams and valves. Operates electrohydraulically. Duration and width of opening can be varied (Fiat, Lancia)

VVC   Variable valve control

VVL   Variable valve lift

VVW   Variable valve displacement

VZ   Electronic ignition timing with static distribution

VZ-K   Electronic ignition timing with static distribution and knock control

X   X division. Diagonal division of brake circuits: one circuit for left-front and right-rear, and one circuit for right-front and left-rear.

XE   Extreme economy. Selection option for extremely economical driving with automatic transmissions

XS   Extreme sport. Selection option for extremely sporty driving with automatic transmissions

YRS   Yaw rate sensor. Component of ESP system

YV   Venezuela

Z.Z.   Currently, at the moment

ZA   Ignition suppression or South Africa

ZAB   Central display and operating unit for information

ZAS   Cylinder shutoff

ZBR   Central vehicle computer

ZDA   Intermediate RPM stop

ZDE   Intermediate RPM adjuster

ZDR   Intermediate RPM control

ZDT   Cyclical nozzle-exchange procedure

ZE   Central injection or Central electronics

ZEE   Central injection unit, Mono-Jetronic

ZEV   Zero-emissions vehicle. Vehicle producing no exhaust gases. See also LEV, NLEV, SULEV, TLEV, and ULEV.

ZGM   Central gateway module

ZGW   Central gateway. Computer that connects and controls data exchange between two networks

ZK   Ignition circuit (airbag system)

ZKO   Ignition capacitor

ZLS   Auxiliary air slider

ZLV   Auxiliary air valve

ZME   Trim unit. Control unit for the high-pressure pump (such as CP3) of a Common Rail system. Measures the fuel quantity fed to the pump.

ZMS   Two-mass flywheel

ZNPB   Central delivery volume normal test stand (special tester for injection pumps)

ZOS   Zero offset disc brake (no residual drag moment)

ZOT   Cylinder top dead centre

ZRE   Zaire

ZS   Ignition coil

ZU   Intermediate inspection

ZUS.LUFTP.   Auxiliary air pump (secondary air injection)

ZV   Central locking or Ignition distributor or Ignition timing adjustment

ZW   Between

ZWD   Two-coil actuator (servomotor with two coils)

ZWG   Intermediate transmission

ZVM   Central locking module

ZVN   Central valve for level adjustment

ZWS   Accessory for immobilizer

ZWV   Ignition timing adjustment

ZYL   Cylinder