Troubleshooting (Start Here)

PRELIMINARY INSPECTION
- Know and understand the customer's concern. Check the fluid levels and condition.
- Verify the concern by operating the vehicle.
- Check for non-factory add-on items.
- Check shift linkages for proper adjustment.
- Check TSBs regarding the concern.

DIAGNOSTICS
- Perform on-board diagnostic procedures key on engine off (KOEO) and key on engine running (KOER).
- Record all diagnostic trouble codes (DTCs).
- Repair all non-transmission codes first.
- Repair all transmission codes second.
- Erase all continuous codes and attempt to repeat them.
- Repair all continuous codes.
- If only pass codes are obtained, proceed to Diagnosis by Symptom Charts for further information and diagnosis.

Follow the diagnostic sequence to diagnose and repair the concern the first time.

KNOW AND UNDERSTAND THE CONCERN
In order to properly diagnose a concern, first understand the customer complaint or condition. Customer contact may be required in order to begin to verify the concern. Understand the conditions as to when the concern occurs. For example:
- Hot or cold vehicle temperature.
- Hot or cold ambient temperature.
- Vehicle driving conditions.
- Vehicle loaded/unloaded.

After understanding when and how the concern occurs. proceed to verify the concern.

VERIFICATION OF CONDITION
Some transmission conditions may cause engine concerns. An EPC short circuit may cause alternate firing. If the torque converter clutch does not disengage, the engine will stall.