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Crankshaft Position Sensor (Method With Oscilloscope)

  1. Disconnect the ground terminal from battery sensor. < Ref. to BATTERY , NOTE, Note. >
  2. Prepare an oscilloscope.
  3. Remove the engine control module (ECM). < Ref. to REMOVAL , Engine Control Module (ECM). >
  4. Install the ST between the ECM and bulkhead harness and the engine harness. < Ref. to CAUTION , General Descriptions

    ST 18460AA030 CHECK BOARD

  5. Connect the ground terminal to battery sensor. < Ref. to BATTERY , NOTE, Note. >
  6. Connect the probe to ST.
    Fig 1: Connecting Ground Terminal To Battery Sensor
    G10291244Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Probe
    19 +
    31 -
  7. Start the engine and let it idle.
  8. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Engine Control Module (ECM) I/O Signal". < Ref. to ENGINE CONTROL MODULE (ECM) I/O SIGNAL . >
  9. After inspection, install the related parts in the reverse order of removal.
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