OEM Diagnostic Procedure

^ VEHICLE BROUGHT TO SHOP ^

1. Fill out Customer Problem Analysis Check Sheet.

2. Check and clear diagnostic trouble codes as described in "How to Display and Read Diagnostic Trouble Codes" and "How to Clear Diagnostic Trouble Codes" under Computers and Control Systems / System Diagnosis.
Testing and Inspection

3. Set up the diagnostic test mode.
- For information refer to "How To Display And Read Diagnostic Trouble Codes" under Computers and Control Systems / System Diagnosis.

4. Problem symptom confirmation (Does the malfunction occur?)
^ YES - Go to step 6.
^ NO - Go to step 5.

5. Symptom simulation as described in "Problem Confirmation Test" under "How To Use OEM Diagnostic Procedures".

6. Diagnostic Trouble Code check.
^ Normal Code Is Output - Go To Step 7.
^ Malfunction Code Is Output - Go To appropriate "Trouble Code Chart" under Diagnostic Charts.
Testing and Inspection

7. Perform the Basic Engine Inspection.
^ If problems are found, proceed according to instructions.
^ If problems are not found during the Basic Engine Inspection, proceed to step 8.

8. Use the diagnostic matrix chart under Diagnosis By Symptom and proceed with component or circuit inspections as indicated.
Testing and Inspection
^ If no problems are identified using these procedures proceed to step 9.

9. Check For momentary interruption as described in the "Problem Confirmation Test" under How To Use OEM Diagnostic Procedures.
^ If diagnostic trouble codes are found using the "Problem Confirmation Test", go to the indicated Trouble Code Chart under the Diagnostic Charts.
Testing and Inspection

^ If problem symptoms are confirmed with the "Problem Confirmation Test", go to the diagnostic matrix chart under Diagnosis By Symptom.
Testing and Inspection

10. Identification of problem.
^ When the problem source has been isolated, perform repairs, adjustments or replace components as indicated. Then proceed to step 11.

11. Following repairs or adjustments always roadtest vehicle to confirm repair.

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