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Camshaft Position Sensor

  1. Disconnect the ground terminal from battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  2. Prepare an oscilloscope.
  3. Disconnect the connector from ECM in numerical order as shown in the figure.
    Fig 1: Locating ECM Connectors
    G11252779Courtesy of SUBARU OF AMERICA, INC.
  4. Attach the ST between the ECM, engine harness and the bulkhead wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>General Description>PREPARATION TOOL>HOW TO USE CHECK BOARD .>

    Special Tool: 

    CHECK BOARD (18460AA120)

  5. Connect the probe to ST.
    Fig 2: Identifying Probe Terminals
    G11252882Courtesy of SUBARU OF AMERICA, INC.
    Camshaft position sensor Terminal No. Probe
    Intake RH (E158) No. 78 +
    LH (E158) No. 77 +
    Exhaust RH (E158) No. 65 +
    LH (E158) No. 64 +
    RH and LH (B134) No. 69 -
  6. Start the engine and let it idle.
  7. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Control Module (ECM) I/O Signal". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Control Module I/O Signal>ELECTRICAL SPECIFICATION .
  8. After inspection, install the related parts in the reverse order of removal.
NOTE: For installation procedures of ECM connectors, refer to Engine Control Module (ECM). Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Engine Control Module (ECM)>INSTALLATION .
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