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Home >> Subaru >> 2012 >> Impreza Base, 4D Sedan, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (H4DO) (Except WRX-STI) >> Crankshaft Position Sensor >> Inspection >> Crankshaft Position Sensor (Method With Oscilloscope)

Crankshaft Position Sensor (Method With Oscilloscope)

  1. Prepare an oscilloscope.
  2. Remove the back panel - pocket. Refer to REMOVAL , Glove Box.
  3. Connect the probe to ECM connector.
    Fig 1: Identifying ECM Connector Terminals
    G08315329Courtesy of SUBARU OF AMERICA, INC.
    Fig 2: Connecting Probe To ECM Connector
    G08315387Courtesy 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 3: Crankshaft Position Sensor Voltage Waveform (One Crankshaft Rotation)
    G08315388Courtesy of SUBARU OF AMERICA, INC.
  6. After inspection, install the related parts in the reverse order of removal.
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