Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 85)

Glossary
GLOSSARY OF TERMS AND ABBRREVIATIONS
Chapter 6 82
GND, GRD or GRND – Ground. Common line leading to the
negative side of the battery.
HALL EFFECT –Process where current is passed through a
small slice of semiconductor material at the same time as a
magnetic field to produce a small voltage in the semiconductor.
HARD FAULT – Fault present during current engine
operating cycle. Opposite of an intermittent fault which does
not stay present.
HBV – Heater Blower Voltage input to EEC-IV processor
reflecting heater blower voltage demand.
HEDF – High-speed Electro-Drive Fan relay or its circuit.
HEGO – Heated Oxygen Sensor or its circuit.
HIC – Hot Idle Compensator.
H.O. – Height Output
HSC – High Swirl Combustion
IAC – Idle Air Control.
IAS – Inlet Air Solenoid valve or its circuit.
IAT – Intake air temperature sensor, performs same function
as MAT sensor.
ICM – Integrated Control Module.
IDLE TRACKING SWITCH – An input device that sends a
signal to the computer to indicate a closed throttle condition.
IDM – Ignition Diagnostics Monitor. Continuous monitor of
ignition input to EEC-IV processor used to detect intermittent
ignition faults.
IGN – Ignition.
INTERMITTENT FAULT – Fault which occurred during a
previous engine operating cycle. Intermittent fault may have
set a fault code which is still present in PCM memory.
IRCM – Integrated Relay Control Module, used on some Ford
systems.
ISA – Idle Speed Actuator. Extends or retracts to control
engine idle speed and to set throttle stop angle during
deceleration.
ISC – Idle Speed Control, either computer control motor, air
bypass valve, or any device used to control idle rpm.
ITS – Idle Tracking Switch.
KAM – Keep Alive Memory. Battery power memory locations
in computer used to store failure codes and some diagnostic
parameters.
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