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Home >> Subaru >> 2009 >> Impreza WRX STi >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (STI) >> Crankshaft Position Sensor >> Inspection >> Crankshaft Position Sensor (Method With Oscilloscope)

Crankshaft Position Sensor (Method With Oscilloscope)

  1. Prepare an oscilloscope.
  2. Remove the lower inner trim of passenger's side. Ref. to REMOVAL , Lower Inner Trim.
  3. Turn over the floor mat of passenger's seat.
  4. Remove the protect cover.
    Fig 1: Locating Protect Cover Bolts
    G05659489Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM Bracket Bolts And Nuts
    G05659490Courtesy of SUBARU OF AMERICA, INC.
  6. Connect the probe to ECM connector.
    Fig 3: Connecting Probe To ECM Connector
    G06344649Courtesy of SUBARU OF AMERICA, INC.
    ECM CONNECTOR TERMINAL REFERENCE CHART

    Terminal No. Probe
    13 +
    14 -
  7. Start the engine and let it idle.
  8. Check the pattern is as same as the waveform and voltage shown below.
    Fig 4: Voltage Waveform
    G06344650Courtesy of SUBARU OF AMERICA, INC.