Diesel Engine
WARNING: This page is about a different car, the 2009 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The signal return is sent to the PCM through circuit RES08 (GN/BN) and the clockspring. When the brake pedal is applied, the stoplamp switch closes and sends voltage to the PCM on circuit CCB08 (VT/WH) to deactivate the speed control if engaged.
The speed control deactivator switch interrupts the voltage signal to the PCM through circuit CMC22 (WH/GN) when the brake pedal is applied firmly. This is a redundant signal to the PCM.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- PCM not configured for speed control (gasoline engines)
- Speed control switches
- Digital Transmission Range (TR) sensor
- Stoplamp switch
- Speed control deactivator switch (diesel engine)
- Vehicle speed signal
- PCM