Actron 9640A manual Freeze Frame, Ground GND, Hall Effect Sensor, Knock Sensor KS

Glossary

EVAP:

Evaporative Emissions System.

FC:

Fan Control

Freeze Frame:

A block of memory containing the vehicle operating conditions for a specific time.

Ground (GND):

An electrical conductor used as a common return for an electric circuit(s) and with a rela- tive zero potential (voltage).

Hall Effect Sensor:

Any of a type of sensor utilizing a permanent magnet and a transistorized Hall Effect switch. Hall Effect type sensors may be used to measure speed and position of the crank- shaft or camshaft — for spark timing and fuel injector control.

HO2S:

Heated Oxygen Sensor. See O2S.

HVAC:

Heating, Ventilation & Air Conditioning (System)

I/M:

Inspection and Maintenance. An emission control program.

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 posi- tion.

ISO:

International Organization of Standardization.

KAM:

Keep Alive Memory

Knock Sensor (KS):

Used to detect engine detonation or “knock.” The sensor contains a piezoelectric element B 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.

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