Diagnostic Strategy

Diagnostic Strategy

NOTE: Do not take short cuts or assume that critical adjustments have already been made.

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

To correctly diagnose a concern, the technician should have the following publications available:
^ Technical Service Bulletins (TSBs)
^ Wiring Diagrams
^ Transmission Tester

These publications provide the information required when diagnosing transaxle concerns.

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

Preliminary Inspection

^ Know and understand the customer concern.
^ Verify the concern by operating the vehicle.
^ Check fluid level and condition.
^ Check non-factory add-on items.
^ Check shift linkages for correct adjustment.
^ Check TSBs for the concern.

Diagnostics

^ Carry out on-board diagnostic procedures; Key On Engine Off (KOEO), and Key On Engine Running (KOER). Displaying & Reading Trouble Codes
^ 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. [1][2]Diagnostic Routines

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