Diagnostic Strategy

Troubleshooting an electronically controlled automatic transaxle is simplified by using the proven method of diagnosis. One of the most important things to remember is that there is a definite procedure to follow. DO NOT TAKE SHORT CUTS OR ASSUME THAT CRITICAL CHECKS OR ADJUSTMENTS HAVE ALREADY BEEN MADE. Follow the procedures as written to avoid missing critical components or steps.

To properly diagnose a concern, the technician should have the Technical service bulletins (TSBs) available:

Using the Diagnostic Flow Chart as a guide, follow the steps as indicated. Diagnostic Flow Chart

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

DIAGNOSTICS
- Perform on-board diagnostic procedures (KOEO, KOER).
- Record all diagnostic trouble codes (DTCs).
- Repair all NON-Transaxle codes FIRST.
- Repair all transaxle codes SECOND.
- Erase all CONTINUOUS codes and attempt to repeat them.
- Repair all continuous codes.
- If ONLY PASS codes, proceed to DIAGNOSIS by SYMPTOM CHARTS for further information and diagnosis.

By following the diagnostic sequence, the service technician will be able to diagnose and repair the concern the first time.