Diagnostic Strategy: Notes

Refer to SYSTEM WIRING DIAGRAMS .

Diagnosis of an electronically-controlled automatic transmission is simple using the following procedures. 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. By following the diagnostic sequence, the technician will be able to diagnose and repair the concern the first time.

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

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

To correctly diagnose a concern, have the following publications available:

Transmission Reference Manual.
Powertrain Control/Emissions Diagnosis Manual¹ .
Technical Service Bulletins (TSBs).
Electrical/Vacuum Troubleshooting Manual (EVTM).

Use the DIAGNOSTIC FLOW CHART as a guide and follow the steps as indicated.