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Camshaft Position Sensor (Method With Oscilloscope)

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
  1. Prepare an oscilloscope.
  2. Remove the glove box lower cover. < Ref. to REMOVAL , Glove Box. >
  3. Remove the lower inner trim of passenger's side. < Ref. to REMOVAL , Lower Inner Trim. >
  4. Turn over the floor mat of passenger's seat.
  5. Remove the protect cover.
    Fig 1: Locating Passengers Seat Floor Mat Mounting Bolts
    G07664721Courtesy of SUBARU OF AMERICA, INC.
  6. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM Bracket Nuts And Bolts
    G07664722Courtesy of SUBARU OF AMERICA, INC.
  7. Connect the probe to ECM connector.
    Fig 3: Connecting Probe To ECM Connector
    G07664723Courtesy of SUBARU OF AMERICA, INC.
    CAMSHAFT POSITION SENSOR REFERENCE CHART

    Camshaft position sensor Terminal No. Probe
    RH 24 +
    LH 16 +
    RH and LH 30 -
  8. Start the engine and let it idle.
  9. Check the pattern is the same as the waveform and voltage shown below.
    Fig 4: Camshaft Position Sensor Voltage Waveform
    G07664724Courtesy of SUBARU OF AMERICA, INC.
  10. After inspection, install the related parts in the reverse order of removal.

    Tightening torque: 

    7.5 N.m (0.8 kgf-m, 5.5 ft-lb) 

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