2021 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

Inhibitor Switch: Inspection

  1. Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  2. Remove the intercooler. Ref. to INTAKE (INDUCTION) (H4DOTC)>Intercooler>REMOVAL .
  3. Disconnect the engine wiring harness connector.
    G13200024Courtesy of SUBARU OF AMERICA, INC.
  4. Check the inhibitor switch signal circuit.
    1. Check the circuit of each range.
      NOTE: If faulty, check the transmission harness for open circuit or short circuit, or poor contact.
      G13621947Courtesy of SUBARU OF AMERICA, INC.
      Terminal No. Inspection conditions Standard
      4 - 24 P range Less than 1 Ξ©
      5 - 24 R range
      9 - 24 N range
      10 - 24 D range
    2. Check continuity when the lever is moved 1.5Β° in the front-rear direction from each range. If there is continuity in only one direction or in other points, adjust the inhibitor switch. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>Inhibitor Switch>ADJUSTMENTΒ .
    G13863838Courtesy of SUBARU OF AMERICA, INC.
    G13621947Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Inspection conditions Standard
    4 - 24 P range Less than 1 Ξ©
    5 - 24 R range
    9 - 24 N range
    10 - 24 D range
  5. Check the neutral switch signal circuit and back-up light circuit.
    G13621947Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Range Standard
    6 - 8 P range and N range Less than 1 Ξ©
    25 - 29 Except for R range ∞Ω
    25 - 29 R range Less than 1 Ξ©
  6. 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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.