2019 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Throttle Sensor (Method With Circuit Tester)

  1. Disconnect the ground terminal from battery sensor. Refer to NOTE>NOTE>BATTERY .
  2. Remove the engine control module (ECM). Refer to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR 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) (EXCEPT FOR STI)>GENERAL DESCRIPTION>CAUTION .

    ST 18460AA030 CHECK BOARD 

  4. Connect the ground terminal to battery sensor. Refer to NOTE>NOTE>BATTERY .
  5. After warming-up the engine, turn the ignition switch to OFF.
  6. Turn the ignition switch to ON. (Engine OFF)
  7. Measure the voltage between ECM connector terminals using ST.
    G13258343Courtesy of SUBARU OF AMERICA, INC.
    Throttle sensor Accelerator pedal Terminal No. Standard
    Main Not depressed (full closed) 17 (+) and 30 (-) Approx. 0.7 V
    Depressed (full opened) Approx. 3.9 V
    Sub Not depressed (full closed) 29 (+) and 30 (-) Approx. 4.4 V
    Depressed (full opened) Approx. 1.1 V
  8. 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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