Tests AC

PINPOINT TEST AC: THE O/D OFF INDICATOR IS NEVER/ALWAYS ON

Test AC1-AC2:

Normal Operation
The overdrive (O/D) off function is controlled by the O/D off switch located on the shifter assembly. When the transmission is placed in the O/D off position, the O/D off switch provides a ground to the powertrain control module (PCM) through circuit 224 (TN/WH). The O/D off status is then transmitted to the instrument cluster from the PCM over the standard corporate protocol (SCP) communication network, circuits 914 (TN/OG) and 915 (PK/LB).

Possible Causes
- PCM
- instrument cluster