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Home >> Subaru >> 2012 >> Impreza WRX STi Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (WRX-STI) >> Throttle Body >> Inspection >> Throttle Sensor Inspection (Method With Circuit Tester)

Throttle Sensor Inspection (Method With Circuit Tester)

  1. Remove the lower inner trim of passenger's side. < Refer to REMOVAL , Lower Inner Trim. >
  2. Turn over the floor mat of passenger's seat.
  3. Remove the protect cover.
    Fig 1: Locating Protect Cover Mounting Screws
    G07704331Courtesy of SUBARU OF AMERICA, INC.
  4. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM Bracket Mounting Nuts And Bolts
    G07704332Courtesy of SUBARU OF AMERICA, INC.
  5. Turn the ignition switch to ON. (engine OFF)
  6. Measure the voltage between ECM connector terminals.
    Fig 3: Measuring Voltage Between ECM Connector Terminals
    G07704333Courtesy of SUBARU OF AMERICA, INC.
    CONNECTOR TERMINALS REFERENCE CHART

    Throttle sensor Accelerator pedal Terminal No. Standard
    Main Not depressed (Full closed) 18(+) and 29 (-) Approx. 0.6 V
    Depressed (Full opened) Approx. 3.96 V
    Sub Not depressed (Full closed) 28 (+) and 29 (-) Approx. 1.48 V
    Depressed (Full opened) Approx. 4.17 V
  7. After inspection, install the related parts in the reverse order of removal.

    Tightening torque: 

    7.5 N.m (0.8 kgf-m, 5.5 ft-lb) 

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