PINPOINT TEST C : TCS (Low Gear Select): Notes
Diagnostic Overview
Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for information about these practices.
Refer to TRANSMISSION CONTROLS SYSTEM - 6F50/6F55 for schematic and connector information.
Normal Operation and Fault Conditions
The TCS (Low Gear Select) is a momentary contact switch located on the column shift selector lever. Pressing the Low Gear Select switch will engage or disengage the Low Gear function of the transmission. When Low Gear is engaged, a Low Gear icon will illuminate on the IPC. Each time the ignition switch is cycled, the PCM will disengage the Low Gear operation regardless of the switch position the last time the engine was running.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1780 | Transmission Control Switch (O/D Cancel) Circuit Out Of Self Test Range | The TCS (Low Gear Select) failed during the KOER self-test. |
Possible Sources
- Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.
- Fuse 35 (5A)
- Low Gear Select switch
- PCM