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Home >> Subaru >> 2016 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (WRX-STI) >> Crankshaft Position Sensor >> Inspection >> Crankshaft Position Sensor (Method With Oscilloscope)
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Crankshaft Position Sensor (Method With Oscilloscope)

  1. Prepare an oscilloscope.
  2. Remove the glove box. < Ref. to REMOVAL , Glove Box. >
  3. Connect the probe to ECM connector.
    Fig 1: Connecting Probe To ECM Connector
    G10289831Courtesy of SUBARU OF AMERICA, INC.

    (A) To ECM connector

    Terminal No. Probe
    17 +
    25 -
  4. Start the engine and let it idle.
  5. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Engine Control Module (ECM) I/O Signal". < Ref. to ELECTRICAL SPECIFICATION , Engine Control Module (ECM) I/O Signal. >
  6. After inspection, install the related parts in the reverse order of removal.
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