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 Schematics

Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSIS PROCEDURE CHART

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR . Turn the ignition switch to OFF. Disconnect the connector from the 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 of the harness between the 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 short circuit to ground in harness between ECM and accelerator pedal position sensor connector. Replace the ECM if defective. Refer to ENGINE CONTROL MODULE (ECM) .