Diagnostic Strategy

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.

NOTE: 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 correctly diagnose a concern, have the following available:
^ Technical Service Bulletins (TSBs)
^ Wiring Diagrams

These provide the information required when diagnosing transaxle concerns.

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

Preliminary Inspection

^ Know and understand the customer's concern.
^ Verify the concern by operating the vehicle.
^ Check the fluid levels and condition.
^ Check for non-factory-installed items and verify correct installation.
^ Check shift linkages for correct adjustment.
^ Check TSBs regarding the concern.
^ Carry out quick tests, both KOER and KOEO.
^ Record all codes.

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 for further information and diagnosis. Diagnosis By Symptom

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