Test P: The Overdrive (O/D) Off Indicator Is Never/Always On

PINPOINT TEST P: THE OVERDRIVE (O/D) OFF INDICATOR IS NEVER/ALWAYS ON

Normal Operation
The overdrive (O/D) off function is controlled by the O/D off switch located on the shifter assembly. When the transmission control switch is placed in the O/D OFF position, the O/D off switch provides voltage to the PCM. The PCM provides the overdrive off status to the instrument cluster (IC) over the high speed controller area network (HS-CAN) communication bus. When the overdrive is turned off, the PCM sends a message to the instrument cluster (IC) to turn on the O/D off indicator. If an O/D fault condition is detected, the PCM sends a message to the instrument cluster (IC) to flash the O/D off indicator. If the O/D status message is missing for more than 5 seconds, the instrument cluster (IC) illuminates the O/D off indicator. The instrument cluster (IC) sets DTC U0100 in continuous memory if the PCM data is missing for more than 5 seconds or if invalid data is received and the instrument cluster (IC) turns on the O/D off indicator.

This pinpoint test is intended to diagnose the following:
- PCM
- Instrument cluster (IC)

P1-P4:

P5-P6: