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Circuit/System Verification

  1. Ignition ON.
  2. Verify that no ignition, KR27 Starter Relay, clutch pedal position sensor, brake pedal position sensor, engine, or immobilizer DTCs are set that would cause the ECM to disable engine starting.
    • If no DTCs are set 
  3. Verify the scan tool BCM 5 V Ignition Switch (vehicles without push button start) or ECM Power Mode (vehicles with push button start) parameter is Crank Request while attempting to start the vehicle.
    • If parameter displays Crank Request 
  4. Attempt to start the vehicle.
  5. Verify the scan tool ECM Crankshaft Position Active Counter parameter is not incrementing.
    • If the counter increments 

      Replace the B26 Crankshaft Position Sensor.

    • If the counter does not increment 
  6. Verify the crank relay does click and the engine begins cranking.
    • If the KR27 Starter Relay does not click or the engine does not begin cranking 

      Refer to Circuit/System Testing.

    • If the KR27 Starter Relay does click and the engine does begin cranking 
  7. All OK
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