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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.
    G13198164Courtesy of SUBARU OF AMERICA, INC.
  4. Attach the ST between the ECM, engine harness and the bulkhead wiring harness. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>General Description>PREPARATION TOOL>HOW TO USE CHECK BOARD .

    Special tool: 

    CHECK BOARD (18460AA150)

  5. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  6. Connect the probe to ST.
    G13198283Courtesy of SUBARU OF AMERICA, INC.
    Camshaft position sensor Terminal No. Probe
    Intake RH (E159) No. 20 +
    LH (E159) No. 29 +
    Exhaust RH (E159) No. 21 +
    LH (E159) No. 13 +
    RH and LH (B134) No. 40 -
  7. Connect the ground terminal to battery sensor. Ref. to REPAIR CONTENTS>NOTE>BATTERY .
  8. Start the engine and let it idle.
  9. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Control Module (ECM) I/O Signal". Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>Control Module I/O Signal>ELECTRICAL SPECIFICATION .
  10. 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) (H4DOTC)>Engine Control Module (ECM)>INSTALLATION .
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