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Camshaft Position Sensor (Method With Oscilloscope)

  1. Prepare an oscilloscope.
  2. Remove the glove box lid assembly. Refer to GLOVE BOX .
  3. Connect the probe to ECM connector.
    Fig 1: Locating Glove Box Lid Assembly
    G06648245Courtesy of SUBARU OF AMERICA, INC.
    • Intake camshaft position sensor
      Fig 2: Connecting Probe To ECM Connector (Intake Camshaft Position Sensor)
      G07910752Courtesy of SUBARU OF AMERICA, INC.
    • Exhaust camshaft position sensor
      Fig 3: Connecting Probe To ECM Connector (Exhaust Camshaft Position Sensor)
      G07910753Courtesy 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 that the pattern is the same as the waveform and voltage shown below.
    Fig 4: Camshaft Position Sensor Signal Waveform
    G07910754Courtesy of SUBARU OF AMERICA, INC.
  6. After inspection, install the related parts in the reverse order of removal.
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