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Home >> Subaru >> 2015 >> WRX STI Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (STI) >> 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. <Ref. to REMOVAL , Glove Box.>
  3. Connect the probe to ECM connector.
    • Intake camshaft position sensor
      Fig 1: Connecting Probe To ECM Connector For Intake Camshaft Position Sensor
      G10264820Courtesy of SUBARU OF AMERICA, INC.
    • Exhaust camshaft position sensor
    Fig 2: Connecting Probe To ECM Connector For Exhaust Camshaft Position Sensor
    G10264821Courtesy of SUBARU OF AMERICA, INC.
    Camshaft position sensor Terminal No. Probe
    Intake RH 24 +
    LH 16 +
    Exhaust RH 23 +
    LH 29 +
    RH and LH 30 -
  4. Start the engine and let it idle.
  5. Check the pattern is the same as the waveform and voltage shown below.
    Fig 3: Camshaft Rotation Voltage Waveform Pattern
    G10264822Courtesy of SUBARU OF AMERICA, INC.
  6. After inspection, install the related parts in the reverse order of removal.
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