Test T: The O/D Off Indicator Is Never/Always On

PINPOINT TEST T: THE 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. The instrument cluster (IC) receives the overdrive off message from the PCM through the communication network. When the transmission overdrive is selected off, the overdrive off switch provides a ground signal to the PCM. The PCM, upon receipt of the overdrive off ground signal, provides an overdrive off message to the instrument cluster (IC) and the instrument cluster (IC) illuminates the O/D off indicator.

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

T1-T2:

T3-T4: