DTC P2122 Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input: Wiring Diagram

Engine electrical system, 2.5 L model (without push button start). See appropriate SYSTEM WIRING DIAGRAM article.
Engine electrical system, 2.5 L model (with push button start). See appropriate SYSTEM WIRING DIAGRAM article.

Fig 1: Throttle/Pedal Position Sensor/Switch D - Circuit Diagram
Courtesy of SUBARU OF AMERICA, INC.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR. Turn the ignition switch to OFF. Disconnect the connectors from ECM and accelerator pedal position sensor. Measure the resistance between ECM and chassis ground. Connector & terminal (B135) No. 21 - Chassis ground: (B135) No. 23 - Chassis ground: (B135) No. 23 - (B137) No. 4:	Is the resistance 1 MΩ or more?	Go to step 2 .	Repair the short circuit to ground in harness between ECM and accelerator pedal position sensor connector.
2 CHECK SHORT CIRCUIT INSIDE THE ECM. Connect the connector to ECM. Measure the resistance between accelerator pedal position sensor connector and chassis ground. Connector & terminal (B315) No. 6 - 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) .