Troubleshooting the automatic transmission 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. Do not take short cuts or assume that critical checks or adjustments have already been made.

The following procedures are recommended for checking and/or verifying that the various components are adjusted and operating properly. Use Rotunda Automatic Transmission Tester 014-00737 or equivalent. Follow the manufacturer's instructions.

Engine Idle Speed Check

If the idle speed is too low, the engine will run rough. An idle speed that is too high will cause the vehicle to creep, have harsh engagements and harsh closed throttle downshifts.

Check and, if necessary adjust the engine idle speed. Refer to the Powertrain Control/Emissions Diagnosis Manual .