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9620 Professional OBD II Scan Tool 3
Vehicle ServiceInformation
The following is a list of publishers who have manuals containing electronic engine
control diagnostic information. Some manuals may be available at auto part stores
or local public libraries. For others, write for availability and pricing, specifying the
make, model and year of vehicle.
Service Manuals:
Chilton Book Company
Chilton Way
Radnor, PA 19089
Haynes Publications
861 Lawrence Drive
Newbury Park, CA 91320
Cordura Publications
Mitchell Manuals, Inc.
Post Office Box 26260
San Diego, CA 92126
Motors Auto Repair Manual
Hearst Company
250 W 55th Street
New York, NY 10019
Manufacturer Service Manuals:
General Motors:
Buick, Cadillac, Chevrolet, GEO,
GMC, Oldsmobile, & Pontiac
Helm Incorporated
Post Office Box 07130
Detroit, MI 48207
Saturn
Adistra Corporation
c/o Saturn Publications
101 Union St.
Post Office Box 1000
Plymouth, MI 48170
Ford Motor Company:
Ford, Lincoln, & Mercury
Ford Publication Department
Helm Incorporated
Post Office Box 07150
Detroit, MI 48207
Chrysler Corporation:
Chrysler, Plymouth, & Dodge
Chrysler Motors Service Training
26001 Lawrence Avenue
Center Line, MI 48015
Suitable manuals have titles, such as:
Electronic Engine Controls
Fuel Injection and Feedback Carburetors
Fuel Injection and Electronic Engine Controls
Emissions Control Manual
. . . or similar titles
34 9620 Professional OBD II Scan Tool
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.
EVAP:
Evaporative Emissions System.
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 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.
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.
ICM:
Ignition Control Module.
I/M:
Inspection and Maintenance. An emission control program.
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.
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.
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.
KOEO:
Key On Engine Off.
KOER:
Key On Engine Running.
LCD:
Liquid Crystal Display.
LT:
Long Term fuel trim.