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Camshaft Position Sensor: Inspection

  1. Prepare an oscilloscope.
  2. Remove the lower inner trim of passenger's side. Refer to REMOVAL , Lower Inner Trim.
  3. Turn over the floor mat of passenger's seat.
  4. Remove the protect cover.
    Fig 1: Locating Protect Cover Mounting Bolts
    G05659489Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM To Bracket Nuts And Bolts
    G05659490Courtesy of SUBARU OF AMERICA, INC.
  6. Connect the probe to ECM connector.
    Fig 3: Connecting Probe To ECM Connector
    G06351313Courtesy of SUBARU OF AMERICA, INC.
    ECM CONNECTOR TERMINAL REFERENCE CHART

    Camshaft position sensor Terminal No. Probe
    RH 11 +
    LH 21 +
    RH and LH 22 -
  7. Start the engine and let it idle.
  8. Check the pattern is as same as the waveform and voltage shown below.
Fig 4: View Of Waveform Voltage
G06351314Courtesy of SUBARU OF AMERICA, INC.
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