Don’t know your BCM from your ECM, or your CAN from your LIN? You’re not alone.
Listed here are some of the popular abbreviations that are used in automotive diagnostics.
Remember: if you’re reading an article on our website and see something that has a dotted underline (something that LTT) then if you move your mouse cursor over the underlined word you will see what the abbreviation stands for.
A
- ABS
- anti-lock braking system
- AC
- alternating current
- A/C
- air conditioning
- A/D
- analog-to-digital
- ADC
- analog-to-digital converter
- AFM
- air flow meter
- AFR
- air/fuel ratio (sensor)
- AFS
- air flow sensor
- APS
- atmospheric pressure sensor
- ATDC
- after top dead centre
- ATF
- automatic transmission fluid
- ATS
- air temperature sensor
- AWD
- all wheel drive
B
- BA
- brake assist
- BC
- body computer
- BCM
- body control module
- BDC
- bottom dead centre
- BHP
- brake horse power
- BOB
- break out box
- BPP
- brake pedal position
- BPS
- back pressure sensor
- BSI
- built-in system interface (PSA)
- BTDC
- before top dead centre
C
- CAN
- controller area network
- CAS
- crank angle sensor
- CAS
- car access system (BMW term)
- CARB
- California Air Resources Board
- CB
- circuit breaker
- CCO
- catalytic converter for oxidation
- CDI
- capacitor discharge ignition
- CFI
- central fuel injection
- CFI
- continuous fuel injection
- CHA
- channel A (of scope)
- CHB
- channel B (of scope)
- CHC
- channel C (of scope)
- CHD
- channel D (of scope)
- CHT
- cylinder head temperature sensor
- CID
- cylinder identification
- CKP
- crankshaft position (sensor)
- CMP
- camshaft position (sensor)
- CO
- carbon monoxide
- COP
- coil-on-plug
- CPC
- coil per cyclinder
- CPP
- clutch pedal position
- CPS
- combustion pressure sensor
- CPS
- crankshaft position sensor
- CRD
- common-rail diesel
- CTS
- coolant temperature sensor
- CVVL
- continuous variable valve lift
D
- dB
- decibels
- DC
- direct current
- DI
- direct injection
- DIS
- distributorless ignition system
- DLC
- diagnostic link connector
- DLI
- distributorless ignition
- DOHC
- double over head camshaft
- DOT
- department of transport (USA)
- DPF
- diesel particulate filter
- DPFE
- differential pressure feedback electronic system (Ford term)
- DSG
- direct shift gearbox
- DSO
- digital storage oscilloscope
- DTC
- diagnostic trouble code
E
- EAC
- electronic accelerator control
- EBCM
- electronic brake control module
- EBM
- electronic body module
- ECD
- electronically controlled diesel
- ECM
- engine control module, or electronic control module
- ECT
- electronically controlled automatic transmission
- ECU
- electronic control unit
- EDIC
- electronic diesel injection control
- EDIS
- electronic distributorless ignition system
- EDL
- electronic differential lock
- EGO
- exhaust gas oxygen
- EGR
- exhaust gas recirculation
- EGS
- electronic gearbox control
- EI
- electronic ignition
- EMF
- electromotive force
- EML
- elektronische motorleistungsregelung ‘electronic throttle control’ (BMW term)
- EOBD
- European on-board diagnostics
- EPS
- electronic power steering
- ESP
- electronic stability program
- ESPS
- eccentric shaft position sensor
- ETC
- electronic throttle control
- ETCS-I
- electronic throttle control system - intelligent
- EV
- electric vehicle
- EVAP
- evaporative emission control
- EVR
- electronic vacuum regulator (Ford term)
F
- FFT
- fast fourier transform
- FI
- fuel injection
- FT
- fuel trim
- FTS
- fuel temperature sensor
- FWD
- front wheel drive
G
- GDI
- gasoline direct injection
H
- HBA
- hydraulic brake assist
- HC
- hydrocarbon
- HDI
- high-pressure diesel injection
- HEGO
- heated exhaust gas oxygen (sensor)
- HGV
- heavy goods vehicle (UK term for vehicles over 3.5 tonnes)
- HID
- high intensity discharge (headlight)
- HT
- high tension
- HV
- hybrid vehicle
- HVAC
- heating, ventilation and cooling
- Hz
- hertz (cycles per second)
I
- I-BUS
- instrumentation bus
- IAC
- idle air control
- IAT
- intake air temperature
- IATS
- intake air temperature sensor
- ICM
- ignition control module
- IDI
- indirect injection
- IMI
- Institute of the Motor Industry
- ISC
- idle speed control
- ISCV
- idle speed control valve
K
- K-CAN
- body CAN-bus
- KAM
- keep alive memory
- kHz
- kilohertz (1,000 cycles per second)
- KOEC
- key on, engine cranking
- KOEO
- key on, engine off
- KOER
- key on, engine running
- KS
- knock sensor
- kV
- kilovolt (1,000 volts)
L
- LH
- left-hand
- LIN
- local interconnect network
- LNG
- liquefied natural gas
- LPG
- liquefied petroleum gas
- LT
- low tension
M
- MAF
- mass air flow
- MAP
- manifold absolute pressure
- MFI
- multi-port fuel injection
- MHz
- megahertz (1,000,000 cycles per second)
- MIL
- malfunction indicator light
- MOT
- ministry of transport (UK roadworthiness test)
- MPI
- multi-point injection
N
- NOP
- needle opening pressure
- NTC
- negative temperature coefficient
O
- O2
- oxygen
- OBD
- on-board diagnostics
- OE
- original equipment
- OEM
- original equipment manufacturer
- OHC
- overhead camshaft
- OHV
- overhead valve
P
- PAIR
- pulsed secondary air injection
- PAM
- parking aid module
- PAS
- power assisted steering
- PATS
- passive anti-theft system
- PCM
- powertrain control module
- PCO
- PC oscilloscope
- PID
- Parameter ID (OBD-II)
- PIP
- profile ignition pickup (Ford term)
- PPE
- personal protection equipment
- PPS
- progressive power steering
- psi
- pounds force per square inch
- PSV
- passenger service vehicle
- PT-CAN
- powertrain CAN
- PTC
- positive temperature coefficient
- PSP
- power steering pressure
- PSPS
- power steering pressure switch
- PWM
- pulse width modulation
R
- RH
- right-hand
- RFI
- radio frequency interference
- RMS
- root mean squared
- RPM
- revolutions per minute
- RSS
- road speed sensor
- RWD
- rear wheel drive
S
- SAE
- society of automotive engineers
- SAW
- spark advance word (Ford term)
- SC
- supercharger
- SMG
- Sequential Manual Gearbox
- SOC
- state of charge
- SOHC
- single overhead camshaft
- SPI
- single point injection
- SRM
- speech-recognition module
- STFT
- short term fuel trim
- SUV
- sports utility vehicle
T
- TBI
- throttle body injection
- TC
- turbocharger
- TCM
- transmission control module
- TCU
- transmission control unit
- TD
- turbocharged diesel
- TDC
- top dead centre
- TDI
- turbocharged direct injection
- TPP
- throttle position potentiometer
- TPS
- throttle position sensor
- TWC
- three-way catalyst
U
- USB
- Universal Serial Bus
V
- VAG
- Volkswagen-Audi group
- VAN
- vehicle area network
- VANOS
- variable valve timing control (BMW term)
- VCM
- vehicle control module
- VIN
- vehicle identificaton number
- VPS
- variable power steering
- VR
- variable reluctance
- VSC
- vehicle stability control
- VSS
- vehicle speed sensor
- VVC
- variable valve control
- VVT
- variable valve timing
- VVT-I
- variable vale timing - intelligent
W
- WOT
- wide-open throttle
- WSS
- wheel speed sensor
Thanks to all those who have suggested entries for our jargon buster. Please keep the suggestions coming.
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