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Home >> Subaru >> 2015 >> Forester 2.5i, Eng CD FB25BA, Automatic CVT Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection Fuel Systems (H4DO) >> Crankshaft Position Sensor >> Inspection >> Crankshaft Position Sensor (Method With Oscilloscope)

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: Locating ECM Connector
    G09475529Courtesy of SUBARU OF AMERICA, INC.
    Fig 2: Measuring Crankshaft Position Sensor Waveform At Connector
    G09475530Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Probe
    16 +
    27 -
  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
    G09475531Courtesy of SUBARU OF AMERICA, INC.
  6. After inspection, install the related parts in the reverse order of removal.
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