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Home >> Subaru >> 2015 >> WRX STI >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (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
    G10264809Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Probe
    17 +
    25 -
  4. Start the engine and let it idle.
  5. Check the pattern is the same as the waveform and voltage shown below.
    Fig 2: Crankshaft Rotation Voltage Waveform Pattern
    G10264810Courtesy of SUBARU OF AMERICA, INC.
  6. After inspection, install the related parts in the reverse order of removal.
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