Self-Test Procedures

NOTE: The accuracy of self-test data depends on correct operation of non-EEC components and systems. All non-EEC problems in the engine, ignition or fuel system must be corrected before attempting to diagnose the EEC system.

Perform Key On Engine Off (KOEO) and Key On Engine Running (KOER) self-test procedures with one of the following: SUPER STAR II tester, analog volt-ohmmeter (VOM), or CHECK ENGINE light.

KOEO codes include hard and intermittent failures. To determine failure(s) type (hard or intermittent), record and clear codes stored in ECA memory. Operate vehicle and repeat KOEO self-test. Codes that immediately reappear are hard failures. Codes that do not reappear are intermittent failures.

Repair hard failures, in the order of code appearance, before performing KOER self-test. Use CODE REFERENCE CHART to determine the correct CIRCUIT TEST. Codes may be cleared from the ECA memory after they have been recorded and/or faults repaired. See CLEARING CODES. If no trouble codes are found during KOEO self-test, proceed to KOER self-test.

NOTE: The EEC system will not display a PASS code.