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

JTEC  Combined engine and transmission control module

lack of power, sluggish  The engine has less than expected 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

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 mileage 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

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