• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • B – 5
• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Glossary
B
IAC:
Idle Air Control. A device mounted on the throttle body which adjusts the amount
of air bypassing a closed throttle so that the PCM can control idle speed.
IAT:
Intake Air Temperature (Sensor)
ICM:
Ignition Control Module.
IMRC:
Intake Manifold Runner Control
IPC:
Instrument Panel Cluster
ISC:
Idle Speed Control. A small electric motor mounted on the throttle body and
controlled by the PCM. The PCM can control idle speed by commanding the ISC
to adjust its position.
ISO:
International Organization of Standardization also know as International
Standards Organization.
KAM:
Keep Alive Memory
Knock Sensor (KS):
Used to detect engine detonation or knock. The sensor contains a piezoelectric
element and is threaded into the engine block. Special construction makes the
element sensitive only to engine vibrations associated with detonation.
Knock:
Uncontrolled ignition of the air/fuel mixture in the cylinder. Also referred to as
detonation or ping. Knock indicates extreme cylinder pressures or “hotspots”
which are causing the air/fuel mixture to detonate prematurely.
KOEO:
Key On Engine Off. Turn the ignition key to on, but don’t start engine.
KOER:
Key On Engine Running. Start the vehicle.
LCD:
Liquid Crystal Display
LTFT:
Long Term Fuel Trim
M/T:
Manual transmission or manual transaxle.
MAF:
Mass Air Flow (sensor). Measures the amount and density of air entering the
engine and sends a frequency or voltage signal to the PCM. The PCM uses this
signal in its fuel delivery calculations.
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