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Home >> Subaru >> 2021 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (2.5L) >> Camshaft Position Sensor >> Inspection >> Camshaft Position Sensor (Method With Oscilloscope)
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Camshaft Position Sensor (Method With Oscilloscope)

  1. Prepare an oscilloscope.
  2. Remove the glove box. Refer to EXTERIOR/INTERIOR TRIM>GLOVE BOX>REMOVAL .
  3. Connect the probe to ECM connector.
    G13640074Courtesy of SUBARU OF AMERICA, INC.
    Camshaft position sensor Terminal No. Probe
    Intake RH (B137) No. 24 +
    LH (B137) No. 16 +
    Exhaust RH (B137) No. 23 +
    LH (B137) No. 29 +
    RH and LH (B134) No. 3 -
  4. Start the engine and let it idle.
  5. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Engine Control Module (ECM) I/O Signal". Refer to ENGINE (DIAGNOSTICS) (STI)>Engine Control Module (ECM) I/O Signal>ELECTRICAL SPECIFICATION .
  6. After inspection, install the related parts in the reverse order of removal.
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