P057E

DTC P057B-P057E

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 P057B 00
- Brake Pedal Position Sensor Performance

DTC P057C 00
- Brake Pedal Position Sensor Circuit Low Voltage

DTC P057D 00
- Brake Pedal Position Sensor Circuit High Voltage

DTC P057E 00
- Brake Pedal Position Sensor Circuit Erratic

Diagnostic Fault Information






Circuit/System Description

The brake pedal position (BPP) sensor is used to sense the action of the driver application of the brake pedal. The BPP sensor provides an analog voltage signal that will increase as the brake pedal is applied. The engine control module (ECM) provides a low reference signal and a 5-volt reference voltage to the BPP sensor.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.
* Brakes APPLIED.

Conditions for Setting the DTC

DTC P057B 00

The DTC will set when the BPP sensor home position is not learned.

DTC P057C 00
* The ECM detects a short to voltage in the BPP sensor 5 V reference circuit.
* The ECM detects a short to ground or an open/high resistance in the BPP sensor 5 V reference circuit.
* The ECM detects a short to ground or an open/high resistance in the BPP sensor signal circuit.

DTC P057D 00
* The ECM detects a short to voltage in the BPP sensor signal circuit.
* The ECM detects an open/high resistance in the BPP sensor low reference circuit.

DTC P057E 00

The ECM detects the BPP sensor signal is changing faster than possible under normal operating conditions.

Actions Taken When the DTC Sets

The ECM limits functions which rely on the brake pedal position sensor inputs.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 50 malfunction-free ignition cycles have occurred.

Reference Information
Schematic Reference

Exterior Lights Schematics Exterior Lights Schematics
Connector End View Reference

Component Connector End Views Sunshade - Left (D6I)
Description and Operation

Exterior Lighting Systems Description and Operation Exterior Lighting Systems
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 Testing

DTC P057C 00 and P057D 00
1. Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor.
2. Ignition ON, verify that a test lamp illuminates between B+ and the low reference circuit terminal 6.

• If the test lamp does not illuminate, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. 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 K20 ECM.
• If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Test for less than 0.3 V between the signal circuit terminal 4 and ground.

• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Test for 4.8-5.2 V between the 5 V reference circuit terminal 5 and the signal circuit terminal 4.

• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

6. Ignition OFF, disconnect the X3 harness connector at the K20 ECM.
7. Test for infinite resistance between the signal circuit terminal 4 and ground.

• If less than the specified range, test the signal circuit for a short to ground.

8. If all circuits test normal, replace the B22 brake pedal position sensor.

DTC P057B 00
1. Verify that the DTC sets under the Conditions for Running and Setting.
2. Perform the brake pedal position sensor calibration procedure. Refer to Brake Pedal Position Sensor Calibration .
3. Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.

• If DTC P057B 00 resets as current, replace the B22 brake pedal position sensor.

DTC P057E 00
1. Replace the brake pedal position sensor.
2. Perform the brake pedal position sensor calibration procedure. Refer to Brake Pedal Position Sensor Calibration .
3. Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.

• If DTC P057E 00 resets as current, replace the K20 ECM.

Repair Instructions

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

* Brake Pedal Position Sensor Calibration
* Brake Pedal Position Sensor Replacement
* Control Module References Control Module References for ECM replacement, setup, and programming