FixVault

Camshaft Position Sensor (Method With Oscilloscope)

  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 protective cover.
    Fig 1: Locating Protecting Cover Mounting Screws
    G08538756Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM Mounting Nuts
    G08538757Courtesy of SUBARU OF AMERICA, INC.
  6. Connect the probe to ECM connector.
    • Intake camshaft position sensor
      Fig 3: Connecting Probe To ECM Connector (Intake Camshaft Position Sensor)
      G08538758Courtesy of SUBARU OF AMERICA, INC.
    • Exhaust camshaft position sensor
      Fig 4: Connecting Probe To ECM Connector (Exhaust Camshaft Position Sensor)
      G08538759Courtesy 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 -
  7. Start the engine and let it idle.
  8. Check the pattern is the same as the waveform and voltage shown below.
    Fig 5: Camshaft Position Sensor Waveforms
    G08538760Courtesy of SUBARU OF AMERICA, INC.
  9. 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)