2020 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Check Accelerator Pedal Sensor Area (Method With Circuit Tester)

  1. Disconnect the ground terminal from battery sensor. Refer to NOTE>NOTE>BATTERY .
  2. Remove the ECM. Refer to FUEL INJECTION (FUEL SYSTEMS) (W/O STI)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
  3. Install the ST between the ECM and bulkhead harness and the engine wiring harness. Refer to ENGINE (DIAGNOSTICS) (W/O STI)>GENERAL DESCRIPTION>CAUTION .

    ST 18460AA030 CHECK BOARD 

  4. Connect the ground terminal to battery sensor. Refer to NOTE>NOTE>BATTERY .
  5. Turn the ignition switch to ON. (Engine OFF)
  6. Measure the voltage between ECM connector terminals using ST.
    • Main sensor side
      G13642340Courtesy of SUBARU OF AMERICA, INC.
    • Sub sensor side
    G13642341Courtesy of SUBARU OF AMERICA, INC.
    Accelerator pedal sensor Accelerator pedal Terminal No. Standard
    Main Not depressed (full closed) 17 (+) and 31 (-) 0.4 - 1.0 V
    Depressed (full opened) 2.4 - 3.7 V
    Sub Not depressed (full closed) 29 (+) and 19 (-) 0.4 - 1.0 V
    Depressed (full opened) 2.4 - 3.7 V
  7. After inspection, install the related parts in the reverse order of removal.
Factory Service Tools

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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.

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