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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (H4DOTC) >> Crankshaft Position Sensor >> Inspection >> Crankshaft Position Sensor (Method With Oscilloscope)

Crankshaft Position Sensor (Method With Oscilloscope)

  1. Disconnect the ground cable from battery.
  2. Prepare an oscilloscope.
  3. While pressing the section (A) shown in the figure, move the lock lever (B) in the direction of the arrow to disconnect the connectors from the ECM in numerical order as shown in the figure.
    Fig 1: Moving Lock Lever
    G09476657Courtesy of SUBARU OF AMERICA, INC.
  4. Install the special tool between the ECM and body harness and the engine harness. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>General Description>CAUTION .

    ST 18460AA030 CHECK BOARD 

  5. Connect the battery ground terminal.
  6. Connect the probe to ST.
    Fig 2: Checking Waveforms And Voltage
    G11264981Courtesy of SUBARU OF AMERICA, INC.
    Terminal No. Probe
    19 +
    31 -
  7. Start the engine and let it idle.
  8. Check the waveforms and voltage.
    NOTE: For waveform and voltage, refer to "Control Module I/O Signal". Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Engine Control Module (ECM) I/O Signal>ELECTRICAL SPECIFICATION .
  9. After inspection, install the related parts in the reverse order of removal.
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