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Camshaft Position Sensor

  1. Disconnect the ground terminal from 12V engine restart battery sensor. Refer to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
  2. Prepare an oscilloscope.
  3. Disconnect the connector from ECM. Refer to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM)>REMOVAL .
  4. Attach the ST between the ECM, engine harness and the bulkhead wiring harness. Refer to ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>GENERAL DESCRIPTION>PREPARATION TOOL>HOW TO USE CHECK BOARD .

    Special tool: 

    CHECK BOARD (18460AA180)

  5. Connect the probe to ST.
    G13223954Courtesy 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. Connect the ground terminal to 12V engine restart battery sensor. Refer to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
  7. Start the engine and let it idle.
  8. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to: ENGINE (DIAGNOSTICS) (H4DO (EXCEPT FOR HEV))>CONTROL MODULE I/O SIGNAL>ELECTRICAL SPECIFICATION .
  9. After inspection, install the related parts in the reverse order of removal.
    NOTE: For installation procedures of ECM connectors, refer to: FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>ENGINE CONTROL MODULE (ECM)>INSTALLATION .
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