Glossary of Terms

ABS Anti-lock brake system
Backfire, Popback Fuel ignites in either the intake or the exhaust system
CKP Crank position sensor
CMP Camshaft position sensor
cuts out,misses A steady pulsation or the inability of the engine to maintain a consistent rpm
DLC Data link connector (previously called engine diagnostic connector)
Detonation,spark knock A mild to severe ping, especially under loaded engine conditions
ECT Engine coolant temperature sensor
EGR Exhaust gas recirculation valve and system
Generator Previously called alternator
Hard Start The engine takes longer than usual to start, even though it is able to crank normally.
Hesitation,sag,stumble There is a momentary lack of response when the throttle is opened. This can occur at all vehicle speeds. If it is severe enough, the engine may stall.
IAT Intake/inlet air temperature sensor
IAC Idle air control motor
IAC Combined engine and transmission control module
Lack of power,sluggish The engine has less than expected power, power, with little or no increase in vehicle speed when the throttle is opened.
LDP Leak detection pump
MAP Manifold absolute pressure sensor
MIL Malfunction indicator lamp
MTV Manifold tuning valve
NGC Next generation controller
O2S Oxygen sensor
PCI Programmable communication interface
PCM Powertrain control module
PCV Positive crankcase ventilation
PEP Peripheral expansion port
Poor fuel economy There is significantly less fuel mile-age than other vehicles of the same design ad configuration
Rough,unstable, or erratic idle stalling The engine runs unevenly at idle and causes the engine to shake if it is severe enough. The engine idle rpm may vary (called hunting). This condition may cause stalling if it is severe enough.
SBEC Single board engine controller
SKIM Sentry key immobilizer module
SKIS Sentry key immobilizer system
SKREEM Sentry key remote entry module
SKREES Sentry key remote entry system
Start&Stall The engine starts but immediately dies.
Surge Engine rpm fluctuation without corresponding change in throttle position sensor
TPS Throttle position sensor
TRS Transmission range sensor
VSS Vehicle speed sensor/signal