C0278

DTC C0278

CIRCUIT DESCRIPTION
The brake pedal position sensor (BPP) is a potentiometer. The electronic brake control module (EBCM) supplies a 5-volt reference circuit and low reference circuit to the BPP sensor. The BPP sensor signal circuit is a direct input to the EBCM. The EBCM determines the BPP based on the voltage from the BPP sensor. The EBCM converts the BPP sensor feed back voltage to a digital signal and puts it on the class 2 communication bus.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC C0278 Brake Pedal Position Sensor Not Calibrated

CONDITIONS FOR RUNNING THE DTC
- The EBCM must be powered.
- This test is run continuously.

CONDITIONS FOR SETTING THE DTC
- The BPP sensor calibration procedure has never been performed.
- The last BPP sensor calibration was unsuccessful.

ACTION TAKEN WHEN THE DTC SETS
When DTC C0278 is set the following will occur:
- The engine drive control is disabled.
- The panic brake assist is disabled.
- The traction control system is disabled.
- The vehicle stability enhancement system is disabled.
- The service vehicle soon lamp will illuminate.

CONDITIONS FOR CLEARING THE DTC
- The current DTC will clear when the fault is no longer present.
- A history DTC clears after 100 consecutive ignition cycles in which no faults have occurred.
- Clear the DTC with a scan tool.

TEST DESCRIPTION

Step 1 - Step 6:

The number below refers to the step number on the diagnostic table.
2. This step calibrates the brake position sensor.