DTC P057C: Brake Pedal Position Sensor Circuit Low: Wiring Diagram

WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

Hybrid system < Ref. to WIRING DIAGRAM , Hybrid Electric Vehicle System.>

Fig 1: Brake Pedal Position Sensor Circuit - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DTC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Read the DTC. < Ref. to HYBRID POWERTRAIN CONTROL SYSTEM , OPERATION, Read Diagnostic Trouble Code (DTC).>	Is DTC P1C0C detected? (current malfunction)	Go to step 6 .	Go to step 2 .
2 CHECK CURRENT DATA. Using the Subaru Select Monitor, confirm the current data of hybrid powertrain control system, the value of «Main Brake Pedal Position Sensor Voltage»«Sub Brake Pedal Position Sensor Voltage». < Ref. to HYBRID POWERTRAIN CONTROL SYSTEM , OPERATION, Read Current Data.>	Is the value of «Main Brake Pedal Position Sensor Voltage» approximately 1 V, and the value of «Sub Brake Pedal Position Sensor Voltage» approximately 4 V when the pedal is not depressed? Also, do values of «Main Brake Pedal Position Sensor Voltage» and «Sub Brake Pedal Position Sensor Voltage» change when the pedal is depressed?	Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	Go to step 3 .
3 CHECK CURRENT DATA. Turn the ignition switch to OFF. Disconnect the HPCM connector (B606). Using the Subaru Select Monitor, confirm the current data of hybrid powertrain control system, the value of «Power Sensor Voltage 3». < Ref. to HYBRID POWERTRAIN CONTROL SYSTEM , OPERATION, Read Current Data.>	Is the value approx. 5 V?	Go to step 4 .	Replace the HPCM. < Ref. to HYBRID POWERTRAIN CONTROL MODULE .>
4 CHECK HARNESS (OPEN CIRCUIT). Turn the ignition switch to OFF. Disconnect the brake stroke sensor connector. Using a tester, measure the resistance between the brake stroke sensor connector and the HPCM connector. Connector & terminal (B601) No. 2 - (B606) No. 20: (B601) No. 1 - (B606) No. 24:	Is the resistance less than 1 Ω?	Go to step 5 .	Repair the open circuit of the harness between the HPCM connector and the brake stroke sensor connector.
5 CHECK HARNESS (SHORT TO GROUND). Using a tester, measure the resistance between brake stroke sensor connector and chassis ground. Connector & terminal (B601) No. 2 - Chassis ground: (B601) No. 1 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the brake pedal assembly. < Ref. to BRAKE PEDAL .>	Repair ground short circuit of harness between the HPCM connector and the brake stroke sensor connector.
6 CHECK HARNESS (OPEN CIRCUIT). Turn the ignition switch to OFF. Disconnect the brake stroke sensor connector and the HPCM connector. Using a tester, measure the resistance between the brake stroke sensor connector and the HPCM connector. Connector & terminal (B601) No. 3 - (B606) No. 9:	Is the resistance less than 1 Ω?	Go to step 7 .	Repair the open circuit of the harness between the HPCM connector and the brake stroke sensor connector.
7 CHECK HARNESS (SHORT TO GROUND). Using a tester, measure the resistance between brake stroke sensor connector and chassis ground. Connector & terminal (B601) No. 3 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the brake pedal assembly. < Ref. to BRAKE PEDAL .>	Repair ground short circuit of harness between the HPCM connector and the brake stroke sensor connector.