90-823225--1 10965E-114 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
Troubleshooting
Changes In Terminology
Due to industry standardization of terminology for certain electronic engine controls some names and abbrevi-
ations have changed.
From To
(CTS) Coolant Temperature Sensor (ECT) Engine Coolant Temperature
(TPS) Throttle Position Sensor (TP) Throttle Position
(MAT) Manifold Air Temperature (IAT) Intake Air Temperature
(EST) Electronic Spark Timing (IC) Ignition Control
(ESC) Electronic Spark Control (KS) Knock Sensor
(ALDL) Assembly Line Data Link (DLC) Data Link Connector
Diagnostic Trouble Codes
Code Number Code Description
Code 14 (ECT) Engine Coolant Temperature
Code 21 (TP) Throttle Position Sensor
Code 23 (IAT) Intake Air Temperature
Code 33 (MAP) Manifold Absolute Pressure
Code 42 (IC) Ignition Control
Code 43 (KS) Knock Sensor
Code 51 Calibration Memory Failure
Important Preliminary Checks
Before using this section, you should verify the cus-
tomer complaint, and locate the correct symptom.
Check the items indicated under that symptom.
Several of the following symptom procedures call for
a careful visual/physical check.
The importance of this step cannot be stressed too
strongly, it can lead to correcting a problem without
further checks and can save valuable time.
1. Ensure that engine is in good mechanical condi-
tion.
2. Vacuum hoses for splits, kinks and proper con-
nections.
3. Air leaks at throttle body, plenum and intake man-
ifold.
4. Ignition wires for cracking, hardness and proper
routing.
5. Wiring for proper connections, pinches, and cuts.
If wiring harness or connector repair is neces-
sary.
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