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Home >> Subaru >> 2014 >> Impreza WRX Base, 4D Wagon >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (W/O 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
    G05659489Courtesy of SUBARU OF AMERICA, INC.
  5. Remove the nuts and bolts which hold the ECM to the bracket.
    Fig 2: Locating ECM Mounting Nuts
    G05659490Courtesy of SUBARU OF AMERICA, INC.
  6. Connect the probe to ECM connector.
    Fig 3: Connecting Probe To ECM Connector
    G08539860Courtesy of SUBARU OF AMERICA, INC.
    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: Display - Crankshaft Rotation Pattern
    G08539861Courtesy 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)