Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Subaru >> 2012 >> Impreza WRX STi Limited >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (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 lower inner trim of passenger's side. < Refer 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 Mounting Screws
    G07704432Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM Bracket Mounting Nuts And Bolts
    G07704433Courtesy of SUBARU OF AMERICA, INC.
  6. Connect the probe to ECM connector.
    Fig 3: Connecting Probe To ECM Connector
    G07704434Courtesy of SUBARU OF AMERICA, INC.
    CONNECTOR TERMINALS REFERENCE CHART

    Terminal No. Probe
    17 +
    25 -
  7. Start the engine and let it idle.
  8. Check the pattern is the same as the waveform and voltage shown below.
    Fig 4: Crankshaft Rotation Waveform
    G07704435Courtesy of SUBARU OF AMERICA, INC.
  9. After inspection, install the related parts in the reverse order of removal.

    Tightening torque: 

    7.5 N.m (0.8 kgf-m, 5.5 ft-lb)