Circuit Description
The brake pedal position sensor (BPP) is an input to the electronic brake control module (EBCM). The brake pedal position sensor is a potentiometer type sensor with a 5-volt reference circuit and a low reference circuit. The BCM supplies the 5-volt reference to the BPP.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC C0163 Antilock Brake System (ABS)/Traction Control System (TCS) Brake Switch/Sensor Circuit Low |
| • | DTC C0164 Antilock Brake System (ABS)/Traction Control System (TCS) Brake Switch/Sensor Circuit High |
Conditions for Running the DTC
DTC C0163
The ignition is ON.
DTC C0164
The vehicle speed is greater than 40 km/h (25 mph).
Conditions for Setting the DTC
DTC C0163
The brake pedal position sensor input voltage is between 1.87 volts and 5.03 volts for 2 seconds.
DTC C0164
The brake pedal position sensor input was active for 2 consecutive ignition cycles.
Action Taken When the DTC Sets
If equipped, the following actions occur:
| • | The EBCM disables the TCS/VSES for the duration of the ignition cycle. |
| • | The Traction Control and Active Handling indicator turns ON. |
| • | The DIC displays the following messages: |
| - | Service Traction System |
| - | Service Active Handling |
| • | The ABS remains functional. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
DTC C0163
Possible causes of this DTC are the following conditions:
| • | A signal circuit of the brake pedal position sensor is open. |
| • | The BPP sensor needs calibration. |
| • | All brake lamps are open. |
| • | All brake lamp grounds are open. |
| • | An internal EBCM problem. |
DTC C0164
Possible causes of this DTC are the following conditions:
| • | The brake pedal position sensor circuit is shorted to voltage. |
| • | The brake pedal position sensor is misadjusted. |
| • | The brake pedal position sensor is stuck closed. |
| • | A brake pedal that is binding. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
Does the scan tool display Released? | Go to Step 3 | Go to Step 4 | |
3 |
Does the BPP Sensor parameter change state? | Go to Diagnostic Aids | Go to Step 4 |
4 |
Did you find and correct the condition? | Go to Step 11 | Go to Step 5 |
5 |
Does the scan tool display Released? | Go to Step 8 | Go to Step 6 |
6 | Test the brake pedal position sensor signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
7 | Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
8 | Inspect for poor connections at the harness connector of the brake pedal position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
9 | Replace the EBCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | -- |
10 | Replace the brake pedal position sensor. Refer to Brake Pedal Position Sensor Calibration. Did you complete the replacement? | Go to Step 11 | -- |
11 |
Does the DTC reset? | Go to Step 2 | System OK |
