Secondary Speed Sensor: Inspection

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Inspection
WARNING: This page is about a different variant/trim than selected.
  1. Set the probe of oscilloscope to TCM harness connector.

    Connector & terminalΒ 

    (B54) No. 7 (+) - No. 14 (-):Β 

    Fig 1: Setting Probe Of Oscilloscope To TCM Harness Connector
    G09482004Courtesy of SUBARU OF AMERICA, INC.
  2. Start and warm up the engine.
  3. Check the waveform of secondary speed sensor with engine idling.
    NOTE: The waveform cycle changes as the speed changes.
RENDER: 1.0x

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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.