2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Throttle Sensor (Method With Circuit Tester)

  1. Disconnect the ground terminal from battery sensor. < Ref. to BATTERY , NOTE, Note. >
  2. Remove the engine control module (ECM). < Ref. to REMOVAL , Engine Control Module (ECM). >
  3. Install the ST between the ECM and bulkhead harness and the engine harness. < Ref. to CAUTION , General Descriptions

    ST 18460AA030 CHECK BOARD

  4. Connect the ground terminal to battery sensor. < Ref. to BATTERY , NOTE, Note. >
  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.
    Fig 1: Measuring Voltage Between ECM Connector Terminals Using Check Board ST18460AA030
    G10291108Courtesy 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. 1.1V
  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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