DTC P2127 Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input: Wiring Diagram

Fig 1: Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input - Wiring Diagram

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR. Turn the ignition switch to OFF. Disconnect the connector from ECM and accelerator pedal position sensor. Measure the resistance between ECM and chassis ground. Connector & terminal (B135) No. 22 - Chassis ground: (B135) No. 31 - Chassis ground:	Is the resistance 1 MΩ or more?	Go to step 2.	Repair the ground short circuit of harness between ECM and accelerator pedal position sensor connector.
2 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the ECM. Measure the resistance between accelerator pedal position sensor connector and chassis ground. Connector & terminal (B315) No. 3 - Chassis ground:	Is the resistance 1 MΩ or more?	Replace the accelerator pedal. Refer to ACCELERATOR PEDAL .	Repair the ground short circuit of harness between ECM and accelerator pedal position sensor connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) .