2020 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE

Throttle Sensor (Method With Circuit Tester)

  1. Disconnect the ground cable from battery. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  2. Disconnect the connector from ECM in numerical order as shown in the figure.
    G13198164Courtesy of SUBARU OF AMERICA, INC.
  3. Attach the ST between the ECM, engine wiring harness and the bulkhead wiring harness, Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

    Special Tool: 

    CHECK BOARD (18460AA150)

  4. Connect the battery ground terminal, Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  5. Turn the ignition switch to ON. (Engine OFF)
  6. Measure the voltage between ECM connector terminals.
    G13198165Courtesy of SUBARU OF AMERICA, INC.
    Throttle sensor Accelerator pedal Terminal No. Standard
    Main Not depressed (full closed) 34 (+) and 20 (-) Approx. 0.7 V
    Depressed (full opened) Approx. 3.9 V
    Sub Not depressed (full closed) 32 (+) and 20 (-) Approx. 4.4 V
    Depressed (full opened) Approx. 1.1 V
  7. After inspection, install the related parts in the reverse order of removal.
NOTE: For installation procedures of ECM connectors, refer to Engine Control Module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)>INSTALLATION .
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.