Diagnostic Strategy

Diagnostic Strategy

Special Tools:

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.

NOTE: Do not take any shortcuts or assume that critical checks or adjustments have already been made.

Follow the procedures as written to avoid missing critical components or steps.

To correctly diagnose a concern have the following publications available:
^ Computers and Control Systems.
^ TSBs and OASIS Messages.
^ Wiring Diagram.

These publications provide the necessary information when diagnosing transaxle concerns.

Use the Diagnostic Flow Chart as a guide and follow the steps as indicated.

Preliminary Inspection
^ Know and understand the customers concern.
^ Verify the concern by operating the vehicle.
^ Check the fluid levels and condition.
^ Check for non-factory add-on items.
^ Check shift linkages for correct adjustment.
^ Check TSBs and OASIS messages regarding the concern.

Diagnostics
^ Carry out on-board diagnostic procedures key on engine off (KOEO) and key on engine running (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 are obtained, proceed to the Diagnosis by Symptom Index for further information and diagnosis.

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