Pinpoint Test C : DTC P1780: Notes
Refer to Transmission Controls for schematic and connector information.
Normal Operation
The transmission control switch is a momentary contact switch located on the selector lever. When the switch is pressed the contacts close sending a voltage signal to the PCM and notifies the module to disable the overdrive gear. The PCM sends a message over the MS-CAN to the IPC which illuminates the tow haul indicator light in the IPC. When the switch is depressed again sportmode is enabled, a third button push enables the overdrive gear in the transmission and sends a message to the IPC extinguishing the tow haul light.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1780 | Transmission Control Switch (O/D Cancel) Circuit Out of Self-Test Range | This DTC sets when the transmission control switch circuit self test is out of range (runs during KOER on-demand self-test only). |
Possible Sources
- Circuitry open/shorted
- Transmission control switch
- PCM