Pinpoint Test E : DTC P1780 (TCS): Notes
Diagnostic Overview
Normal Operation and Fault Conditions
The TCS is a momentary contact switch located on the selector lever. Pressing the TCS will engage or disengage the O/D function of the transmission. When the O/D is disengaged, the O/D icon will illuminate OFF on the IPC. Each time the ignition switch is cycled, the transmission will automatically provide O/D operation regardless of TCS position the last time the engine was running.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1780 | TCS Circuit Failure | The TCS failed during the self-test. |
Possible Sources
- Circuitry open/shorted
- TCM
- TCS