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Home >> Subaru >> 2017 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.0L) >> Throttle Body >> Inspection >> Throttle Sensor (Method With Circuit Tester)
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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 Description.> 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 ST
    G11574477Courtesy 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.
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