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Diagnostic Procedure

NOTE: Diagnostic procedures must be performed in proper sequence using the following steps to ensure proper diagnosis.
  1. Verify complaint with customer. Retrieve Diagnostic Trouble Codes (DTCs) from ECM. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Record DTC for future reference.
  2. If DTC exists, go to next step. If no DTC exists but trouble symptom such as stalling or hard starting exists, proceed to TROUBLE SYMPTOMS and then perform a specified inspection procedure for diagnosis of the problem. TROUBLE SYMPTOMS are listed after the Diagnostic Trouble Code (DTC) tests, see SELF-DIAGNOSTIC SYSTEM section in this article.
  3. Clear DTCs from ECM. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Road test vehicle using proper vehicle drive cycle. See VEHICLE DRIVE CYCLE under SELF-DIAGNOSTIC SYSTEM.
  4. Check for a trouble symptom. If trouble symptom, such as stalling or hard starting exists, proceed to TROUBLE SYMPTOMS and then perform a specified inspection procedure for diagnosis of the problem. TROUBLE SYMPTOMS are listed after the Diagnostic Trouble Code (DTC) tests, see SELF-DIAGNOSTIC SYSTEM section in this article.
  5. If no trouble symptom exists, retrieve DTCs from ECM. If DTCs exist, go to next step. If no DTCs exist, problem is intermittent. See INTERMITTENT MALFUNCTION for servicing of an intermittent problem.
  6. Once DTCs are obtained, proceed SELF-DIAGNOSTIC SYSTEM section in this article. Once all repairs are made, ensure DTCs are cleared from PCM. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Repeat vehicle drive cycle to ensure repair is complete and DTC is not reset. See VEHICLE DRIVE CYCLE under SELF-DIAGNOSTIC SYSTEM.
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