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

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Wiring Diagram
WARNING: This page is about a different variant/trim than selected.
  • Engine electrical system turbo engine model (without push button start) < Ref. to TURBO MODEL (WITHOUT PUSH BUTTON START) , WIRING DIAGRAM, Engine Electrical System. >
  • Engine electrical system turbo engine model (with push button start) < Ref. to TURBO MODEL (WITH PUSH BUTTON START) , WIRING DIAGRAM, Engine Electrical System. >
    Fig 1: Throttle/Pedal Position Sensor/Switch Wiring Diagram
    G09480986Courtesy of SUBARU OF AMERICA, INC.
DTC PROCEDURE

Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND ACCELERATOR PEDAL POSITION SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from ECM and accelerator pedal position sensor connector.
  3. Measure the resistance between ECM and engine ground.

    Connector & terminal 

    (B134) No. 30 - Engine ground: 

    (B134) No. 17 - Engine ground: 

    (B134) No. 17 - (B134) No. 19: 

Is the resistance 1 MΩ or more? Go to step . Repair the short circuit to ground in harness between ECM and accelerator pedal position sensor connector.
2 CHECK SHORT CIRCUIT INSIDE THE ECM. 
  1. Connect the connector to ECM.
  2. 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. < Ref. to ACCELERATOR PEDAL . > Repair the short circuit to ground in harness between ECM and accelerator pedal position sensor connector. Replace the ECM if defective. < Ref. to ENGINE CONTROL MODULE (ECM) . >
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.