Reading and Clearing Diagnostic Trouble Codes

AUTOMATIC TRANSMISSION DIAGNOSIS
Diagnosing electronically controlled automatic transmissions is simplified by using the following procedures. It is important to remember 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.

On-Board Diagnostics With WDS or Equivalent Tester
Perform the Quick Tests first using the WDS or equivalent tester.

For information on diagnostic testing features using the WDS or equivalent tester, see WDS or equivalent tester manual.