2018 Subaru Forester 2.0XT PremiumFACTORY OEM SERVICE PROCEDURE

Throttle Sensor (Method With Circuit Tester)

  1. Disconnect the ground cable from battery.
  2. While pressing the section (A) shown in the figure, move the lock lever (B) in the direction of the arrow to disconnect the connectors from the ECM in numerical order as shown in the figure.
    G12508849Courtesy of SUBARU OF AMERICA, INC.
  3. Install the ST between the ECM and body harness and the engine wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>General Description>CAUTION .

    ST 18460AA030

    CHECK BOARD

  4. Connect the battery ground terminal.
  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.
    G12508850Courtesy 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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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.