Actron Professional Enhanced Scan Tool 9640A - Manual (Page 119)

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Glossary
B
Detonation:
See Knock.
DI/DIS:
Direct Ignition/Distributorless Ignition System. A system that produces the ignition spark
without the use of a distributor.
DPFE:
Differential Pressure Feedback – Exhaust Gas Recirculation Sensor
DTC:
Diagnostic Trouble Code. An alphanumeric identifier for a fault condition identified by the
On Board Diagnostic System.
Duty Cycle:
A term applied to signals that switch between “on” and “off”. Duty cycle is the percentage
of time the signal is “on”. For example, if the signal is “on” only one fourth of the time, then
the duty cycle is 25%. The PCM uses duty cycle type signals to maintain precise control
of an actuator.
EBCM:
Electronic Brake Control Module
EBTCM:
Electronic Brake/Traction Control Module
ECM
Engine Control Module
or Electronic Control Module
ECT:
Engine Coolant Temperature sensor. See CTS.
EEPROM:
Electrically Erasable Programmable Read Only Memory
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 Recirculation is used only during
warm engine cruise conditions. EGR flow at other times can cause stalling or no starts.
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 will then retard 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.