A2L WinOLS file containing definition for Map and Axis Data

ADF Boost pressure sensor
AFR Air\Fuel Ratio is how much of air kg is needed to burn 1 kg of fuel, minimum AFR of 16.5 on diesel to avoid smoke, petrol 14.7.
AFS Advanced front-lighting system. Variable light distribution via movable reflectors
AG Automatic transmission
AGN Exhaust-gas aftertreatment
AGR Exhaust-gas recirculation
AGRE EGR control output stage (Endstufe)
AGRF EGR flow
AGRL EGR position sensor (Lagesensor)
AGRV EGR ventilation
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
AOS Automatic Ocupant Sensing
AP Air pump
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
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
AS-NO Exhaust-gas sensor for NOx (nitrogen oxide) content
AS-T Exhaust-gas sensor for temperature
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.
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
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
ATWS Anti-theft warning system (Opel)
AU Exhaust-gas inspection

AUS Australia
AUS Ultrasonic Alarm System
AUT Automatic transmission
AV Outlet valve or Shutoff valve
AW Drive shaft
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.
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)
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)
BEG Begrenzungsmenge, Begrenzung - Limiting amount, limit
BEV Battery electric vehicle
BF Passenger, or passenger-side
BF-AB Passenger airbag
BFA Passenger airbag. See also BF-AB.
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
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)
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
BVSV Bimetallic-controlled vacuum switching valve or Bimetallic vacuum switching valve
BWN Bosch Workshop Network, proper name
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)
CAL California
CAN Controller Area Network, mini-network for exchanging data between computers, proper name
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.
CANDI Can Diagnostic Interface
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
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)
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 percent), 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
CNG Compressed natural gas, fuel for vehicles with gas-powered engines
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.
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
CVN Calibration verification number. Part of OBD, contains the checksums for parameter settings, for example.
CVT Continuously variable transmission
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.
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
DAMOS DAta MOnitoring System, refers to a specific file type extensively used in the automotive industry. A file that includes descriptions of all maps in the super map pack for WinOLS program
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
DDS Diesel theft protection
DECT Digital enhanced cordless telecommunications, standard for data transmission, usually proper name
DEE Digital engine electronics
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
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
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
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
DSU Pressure sensor for ambient pressure
DSV Pressure control valve
DTC Diagnostic trouble code
DTI Diesel direct-injection with distributor pump (Opel)
DTR Distronic. Distance control system (Mercedes)
DURATION Injection duration as calculated from the Injection Quantity (IQ)
DV Pressure supply, or Throttle device
DVD Digital versatile disc. Storage medium with significantly higher storage capacity than a conventional CD.
DVH Pressure valve holder
DW Drivers Wish Map. This map shows the required torque based on the RPM and the Throttle position. The output of this map is Torque in Nm.
DWA Theft warning system, BMW-specific designation
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.

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)
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)
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
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
ECU Electronic control unit, proper name
EDC Electronic diesel control, usually proper name
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, duty cycle is highest at idle and light throttle, so the higher percentage means the EGR valve is open more
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.
EL-V Electronically controlled carburetor
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.
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
EOI End Of Injection, diesel engines gain power until 25 EOI
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
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
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
EVE Electronic distributor injection system (special engine control)
EVR Electronic vacuum regulator
EWD Single-coil actuator, servomotor with one winding
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
EWS Electronic immobilizer
EX Exhaust (or outlet, exhaust-gas recirc. valve, exhaust manifold)
EZ Electronic ignition, usually proper name
EZ-K Electronic ignition timing with knock controls, 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

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
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
FP Accelerator pedal or Delivery pump
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)
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
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
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.
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
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
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.
IC Integrated circuit
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
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
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.
IQ Injection Quantity as requested by the accelerator position
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)
ISN Two types of Individual System Number for BMW: Short ISN (4 bytes or 8 digits) & Long ISN (16 bytes or 32 digits, post 2007)
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)
IVLAN In Vehicle Local Area Network
IWG Inductive travel sensor
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
K-CAN Body CAN bus. Low-speed CAN bus for comfort-system and body electronics. See also PT-CAN and SI-BUS.
K-JETRONIC Continuous injection system, usually proper name
K-RWG Short-circuit ring sensor
KA Knee airbag
KAM Keep-alive memory
KAT Catalytic converter
KB Wire harness
KBA Federal Motor Vehicle Office (Germany)
KBZ Combination brake cylinder
KD Kickdown or Customer service
KDS Kickdown switch
KE Continuous injection, usually proper name
KE-MOTRONI 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
KIW Combined instruments with service-interval indicator. See also SIA.
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
KS Fuel reservoir, or Knock sensor
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
KVA Fuel consumption gauge
KVD Fuel evaporation
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
KW kW: kilowatt, physical unit KW: crankshaft or crankshaft angle or shortwave (radio)
KWH kWh: kilowatt-hours, physical unit
KWP 2000 Keyword Protocol 2000, log for transmitting diagnostic data
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-JETRONIC Electronically controlled injection system (with direct air-mass measurement), usually proper name
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
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.
LH-JETRONI Same as L-Jetronic with hot-wire air-mass sensor, usually proper name
LHA Air-side automatic heater
LHD Left-hand drive
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
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.
LL-STAB Idle stabilization
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
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
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

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-HEAT Mirror Heating, Spiegelheizung (Opel)
M-JET Mono-Jetronic, usually proper name
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, usually is located inline with the intake system, just after the air filter.
MAL Malaysia
MAP Manifold absolute pressure or Intake manifold pressure sensor located at the throttle body or intake manifold
MAPPACK WinOLS complete file containing definition for Map and Axis Data, Factors, Offsets and Precision
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)
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
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
MIN Minimum
MIU Main Instrument Unit
MJ Mono-Jetronic, usually proper name or Model year
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)
MLB Air Mass Sensor (Luftmassenmesser)
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)
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.
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
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
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
MW AM (radio), or Measurement
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
N75 The ECU can operate the valve to vent some of this pressure so the wastegate either does not open, or opens less over a 100 millisecond period (1/10 of a second)
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)
NVF Navigation and traffic control
NW Camshaft
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
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)
OLS WinOLS complete file containing ECU Data and definition for Map and Axis Data
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
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
P-FP p-FP: Delivery pump pressure.
P-IN p-in: Delivery pressure
PA Pa: pascal, physical unit of pressure. See also HPA, KPA, and MPA. PA: Parking assistant
PAG Polyethylene glycol oil, low-temperature oil
PAM Parking assistant module (Opel)
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)
PDE Pump-nozzle unit (new designation is UIS)
PDM Passenger door module (Opel)
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)
PF1t_swtActv_C Switch to deactivate the particle filter functionality: Switch to reset the EEPROM values (DPF Off)
PF1t_swtActvSubs_C Switch for particle filter software activation EEPROM replacement value (DPF Off)
PF1t_swtSrvval_C Switch to deactivate the particle filter functionality: Switch to reset the EEPROM values (DPF Off)
PFA Particle filter system
PFI Port fuel injection, inlet-channel injection
PG Phase sensor
PH Pressure high, high pressure
PHI phi: Greek letter used to designate angles.
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
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.
PSP Power steering pressure
PSPS Power steering pressure switch
PSV Partial intake-manifold pre-heating

PT Power train
PT-CAN Power train CAN bus. High-speed CAN bus for drive-train electronics. See also K-CAN, SI-BUS.
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
PTS Park-Tronic System. Parking aid. See also PDC.
PV Testing instruction
PVS Vacuum switch
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
PY Paraguay
Q Quantity, usually of fuel
Q-AVG Quantity average. Mean of (fuel) quan