Note On Intermittents

If an intermittent Code 29 is being set, the wiring outside the transmission can be checked using diagnostic display. Disconnect the transmission connector and observe the "fourth gear" status light above the "hi" button on the ECC control head. The light will be on with the circuit open. Manipulate the related wring while observing the status light. If the failure is induced, the light will turn off. This wil1 help to isolate the location of the malfunction.

A Code 29 can also be set if the drive (ADL) switch is misadjusted. If the switch remains closed when the vehicle is shifted into neutral it would look to the ECM as if the vehicle is still in drive. This condition would result in an intermittent Code 29 if the vehicle were shifted into neutral while driving above 50 MPH.