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Diagnostic Procedure

NOTE: Diagnostic procedures must be performed in proper sequence using the following steps to ensure proper diagnosis.
  1. Retrieve Diagnostic Trouble Codes (DTCs) from ECM. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Record DTC for future reference.
  2. 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.
  3. Check for a trouble symptom. If trouble symptom, such as stalling or hard starting exists, proceed to trouble symptom inspection table and then perform a specified inspection procedure. Trouble symptom inspection table and trouble symptom inspection procedures are listed after the Diagnostic Trouble Code (DTC) tests. See TROUBLE SYMPTOMS .
  4. If no trouble symptom exists, retrieve DTCs from ECM. Using all DTCs obtained, proceed to SELF-DIAGNOSTIC TESTS . Once all repairs are made, ensure DTCs are cleared from PCM. See procedures under CLEARING DIAGNOSTIC TROUBLE CODES . Repeat vehicle drive cycle to ensure repair complete and DTC is not reset. See VEHICLE DRIVE CYCLE  under SELF-DIAGNOSTIC SYSTEM.
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