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C0294




DTC C0294, C120C, or C12F8

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC C0294 00
- Brake Controls Brake Pedal Position Sensor Input A and B Correlation

DTC C120C
- Brake Pedal Position Sensor 4 Plausibility-B

DTC C12F8
- Brake Pedal Position Sensor 3 Plausibility-A

Diagnostic Fault Information






Circuit/System Description

The electronic brake control module (EBCM) uses input from the electronic brake control brake pedal position sensor and the brake pedal position sensor to determine when the brake pedal is being applied and with how much force. These inputs are used to determine the driver's braking intent which is used to the control amount of pressure applied to the wheels.

Conditions for Running the DTC

* Ignition ON.
* Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

* The EBCM detects an open in the low reference circuit.
* The EBCM detects that the two signal circuits do not match each other.

Action Taken When the DTC Sets

* The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information
Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation

ABS Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Ignition ON, use a scan tool to observe the EBCM, Brake Controls Brake Pedal Position Sensor Input A and B parameter while applying and releasing the brake pedal. The voltage should change between 0-5 V.

Circuit/System Testing

1. Perform a hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis Brake Hydraulic and Assist System Diagnosis.
2. Ignition OFF, disconnect the harness connector at the B201 brake control brake pedal position sensor.
3. Verify that a test lamp illuminates between the low reference circuit terminal 1 and B+.

• If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K17 EBCM.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and ground.

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 EBCM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K17 EBCM.

5. Verify the scan tool Brake Controls Brake Pedal Position Sensor Input A parameter is less than 1 V.

• If greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the K17 EBCM.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 5. Verify the scan tool Brake Controls Brake Pedal Position Sensor Input A parameter is greater than 4.5 V.

• If less than the specified range, test the signal circuit terminal 4 for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 EBCM.

7. Verify the scan tool Brake Controls Brake Pedal Position Sensor Input B parameter is less than 1 V.

• If greater than the specified range, test the signal circuit terminal 6 for a short to voltage. If the circuit tests normal, replace the K17 EBCM.

8. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the 5 V reference circuit terminal 5. Verify the scan tool Brake Controls Brake Pedal Position Sensor Input B parameter is greater than 4.5 V.

• If less than the specified range, test the signal circuit terminal 6 for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 EBCM.

9. If all circuits test normal, replace the B201 brake control brake pedal position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Electronic Brake Control Position Sensor Replacement Service and Repair
* Control Module References Control Module References for EBCM replacement, programming and setup

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