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Glossary
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B
EFE:
Early Fuel Evaporation
EFI:
Electronic Fuel Injection. Any system where a computer controls fuel delivery to
the engine by using fuel injectors.
EGR:
Exhaust Gas Recirculation. The PCM uses the EGR system to recirculate
exhaust gases back into the intake manifold to reduce emissions. EGR is used
only during warm engine cruise conditions.
EOP:
Engine Oil Pressure (Switch)
EOT
Engine Oil Temperature (Sensor)
EPA:
Environmental Protection Agency.
ESC:
Electronic Spark Control. An ignition system function that warns the PCM when
knock is detected. The PCM then retards spark timing to eliminate the knocking
condition.
EST:
Electronic Spark Timing. An ignition system that allows the PCM to control spark
advance timing. The PCM determines optimum spark timing from sensor
information — engine speed, throttle position, coolant temperature, engine load,
vehicle speed, Park/Neutral switch position, and knock sensor condition.
EVAP:
Evaporative Emissions System.
FC:
Fan Control
Freeze Frame:
A block of memory containing DTCs of the vehicle operating conditions for a
specific time.
FTP:
Federal Test Procedure. Strict test of vehicle’s emissions.
Ground (GND):
An electrical conductor used as a common return for an electric circuit(s) and
with a relative 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 crankshaft or camshaft — for spark timing and fuel injector
control.
HO2S:
Heated Oxygen Sensor. See O2S.
HVAC:
Heating, Ventilation & Air Conditioning (System)
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