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Symptom Diagnosis - Engine Controls

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: When battery is disconnected, vehicle computer may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. Go to appropriate COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting the battery.
CAUTION: To prevent damage caused by the improper probing of connector terminals, use the Connector Test Adapter Kit (J 35616-A) for any test that requires probing the following items:
  • The PCM harness connectors.
  • The electrical center fuse/relay cavities.
  • The component terminals.
  • The component harness connector.
NOTE: For exhaust system symptoms, go to DIAGNOSTIC STARTING POINT - ENGINE EXHAUST  .

Symptom checks should not be used unless symptom occurs while vehicle is being tested. To reduce diagnostic time, ensure steps in appropriate BASIC DIAGNOSTIC PROCEDURES and SELF-DIAGNOSTICS articles were performed before diagnosing a symptom. Symptoms available for diagnosis include:

Symptoms available for diagnosis include:

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