- ABS – antilock brake system
- A/C – air conditioning
- AC – air cleaner
- AIR – secondary air injection
- A/T – automatic transmission or transaxle
- SAP – accelerator pedal
- B+ – battery positive voltage
- BARO – barometric pressure
- CAC – charge air cooler
- CFI – continuous fuel injection
- CL – closed loop
- CKP – crankshaft position sensor
- CKP REF – crankshaft reference
- CMP – camshaft position sensor
- CMP REF – camshaft reference
- CO – carbon monoxide
- CO2 – carbon dioxide
- CPP – clutch pedal position
- CTOX – continuous trap oxidizer
- CTP – closed throttle position
- DEPS – digital engine position sensor
- DFCO – decel fuel cut-off mode
- DFI – direct fuel injection
- DLC – data link connector
- DTC – diagnostic trouble code
- DTM – diagnostic test mode
- EBCM – electronic brake control module
- EBTCM – electronic brake traction control module
- EC – engine control
- ECM – engine control module
- ECL – engine coolant level
- ECT – engine coolant temperature
- EEPROM – electrically erasable programmable read only memory
- EFE – early fuel evaporation
- EGR – exhaust gas recirculation
- EGRT – EGR temperature
- EI – electronic ignition
- EM – engine modification
- EPROM – erasable programmable read only memory
- EVAP – evaporative emission system
- FC – fan control
- FEEPROM – flash electrically erasable programmable read only memory
- FF – flexible fuel
- FP – fuel pump
- FPROM – flash erasable programmable read only memory
- FT – fuel trim
- FTP – federal test procedure
- GCM – governor control module
- GEN – generator
- GND – ground
- H2O – water
- HO2S – heated oxygen sensor
- HO2S1 – upstream heated oxygen sensor
- HO2S2 – up or downstream heated oxygen sensor
- HO2S3 – downstream heated oxygen sensor
- HC – hydrocarbon
- HVS – high voltage switch
- HVAC – heating ventilation and air conditioning system
- IA – intake air
- IAC – idle air control
- IAT – intake air temperature
- IC – ignition control circuit
- ICM – ignition control module
- IFI – indirect fuel injection
- IFS – inertia fuel shutoff
- I/M – inspection/maintenance
- IPC – instrument panel cluster
- ISC – idle speed control
- KOEC – key on, engine cranking
- KOEO – key on, engine off
- KOER – key on, engine running
- KS – knock sensor
- KSM – knock sensor module
- LTFT – long term fuel trim
- MAF – mass airflow sensor
- MAP – manifold absolute pressure sensor
- MC – mixture control
- MDP – manifold differential pressure
- MFI – multiport fuel injection
- MIL – malfunction indicator lamp
- MPH – miles per hour
- MST – manifold surface temperature
- MVZ – manifold vacuum zone
- NVRAM – nonvolatile random access memory
- NOX – oxides of nitrogen
- O2S – oxygen sensor
- OBD – onboard diagnostics
- OBD I – onboard diagnostics generation one
- OBD II – onboard diagnostics, second generation
- OC – oxidation catalyst
- ODM – output device monitor
- OL – open loop
- OSC – oxygen sensor storage
- PAIR – pulsed secondary air injection
- PCM – powertrain control module
- PCV – positive crankcase ventilation
- PNP – park/neutral switch
- PROM – program read only memory
- PSA – pressure switch assembly
- PSP – power steering pressure
- PTOX – periodic trap oxidizer
- RAM – random access memory
- RM – relay module
- ROM – read only memory
- RPM – revolutions per minute
- SC – supercharger
- SCB – supercharger bypass
- SDM – sensing diagnostic mode
- SFI – sequential fuel injection
- SRI – service reminder indicator
- SRT – system readiness test
- STFT – short term fuel trim
- TB – throttle body
- TBI – throttle body injection
- TC – turbocharger
- TCC – torque converter clutch
- TCM – transmission or transaxle control module
- TFP – throttle fluid pressure
- TP – throttle position
- TPS – throttle position sensor
- TVV – thermal vacuum valve
- TWC – three way catalyst
- TWC+OC – three way + oxidation catalytic converter
- VAF – volume airflow
- VCM – vehicle control module
- VR – voltage regulator
- VS – vehicle sensor
- VSS – vehicle speed sensor
- WU-TWC – warm up three way catalytic converter
- WOT – wide open throttle
OBD2/SAE ACRONYMS
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