Testing Procedure

To ensure correct diagnosis and repair, testing should be done in the following sequence:

1. Ensure all customer complaints or observations are recorded. Test drive vehicle with customer, when necessary, for malfunction verification.
2. Retrieve and record stored DTCs and freeze frame data stored. Clear freeze frame data and erase DTC(s). See CLEARING CODES .
3. Recreate conditions in which malfunction occurred to reset DTC. If DTC is detected, go to step  5. If malfunction is not detected, consider the following conditions to recreate an intermittent malfunction:
   • Drive vehicle on rough road or with engine vibrating at idle (with A/C on).
   • Incident occurs on only extremely hot or cold days.
   • Water may intrude into connectors and cause corrosion between connector terminals.
   • Operate multiple accessories (P/W, P/L, A/C, wipers, lights, etc.).
   • Start vehicle either hot or cold.
   • Wiring harnesses may be checked by gently wiggling wire harness during testing. Relays and sensors may be checked by gently tapping during testing.
     NOTE: Perform DTCs in order of priority. See MULTIPLE DTC PRIORITY IDENTIFICATION  table.

   If malfunction is still not detected, go to next step.

4. Perform DTC CONFIRMATION TEST at the beginning of each DTC diagnostic test to set appropriate DTC. See appropriate SELF-DIAGNOSTICS article.
5. If DTC is set, perform appropriate procedure. If DTC does not reset, diagnose malfunction by symptom. See TROUBLE SHOOTING - NO CODES article for diagnosis by symptoms. After performing necessary repairs, go to next step.
6. Rerun test situations which set DTC(s). Retrieve codes and confirm DTC P0000 (System Normal) is detected. Clear DTC(s) from PCM and TCM memory. See CLEARING CODES .