Circuit Description
The body control module (BCM) applies a ground through the brake sensor reference low circuit to the brake position sensor. The BCM supplies a 5-volt reference through the brake sensor reference voltage circuit to the brake position sensor. When the brake pedal is being applied, the brake position sensor then sends a variable voltage signal through the brake sensor signal circuit to the BCM.
Conditions for Running the DTC
The battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
This DTC will set if the brake position sensor is out of calibration.
Conditions for Clearing the DTC
| • | This DTC will clear on current status after the condition for setting the fault is corrected. |
| • | A history DTC will clear after 100 consecutive ignition cycles with out a fault present. |
| • | A history and current DTCs can be cleared using a scan tool. |
Diagnostic Aids
| • | If DTC C0278 00 sets then recalibrate the brake position sensor. |
| • | Perform a visual inspection for a loose or poor connection at all related components. Refer to Testing for Intermittent Conditions and Poor Connections . |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the scan tool display DTC C0278 00? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections |
3 | Recalibrate the brake position sensor. Did you complete the repair? | Go to Step 4 | -- |
4 |
Does the scan tool display DTC C0278 00? | Go to Step 5 | Go to Step 6 |
5 |
Important: After replacing the brake position sensor, perform the calibration procedure. Refer to Brake Pedal Position Sensor Calibration . Replace the brake position sensor. Refer to Brake Pedal Position Sensor Replacement . Did you complete the replacement? | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | System OK |
