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Circuit/System Verification

  1. Ignition ON, observe the scan tool PNP Switch parameter while shifting the transmission. The reading should change between Park/Neutral and In Gear.
    • If not the specified values, refer to Park Switch Malfunction.
  2. Transmission in park, attempt to start the vehicle. The starter relay should click and the engine should begin cranking.
    • If the crank relay does not click or the engine does not crank, refer to CRNK Relay Malfunction.
  3. Ignition ON, observe the scan tool ECM Crankshaft Position Sensor Active Counter is not incrementing.
    • If the Crankshaft Position Sensor Active Counter is incrementing, replace the Crankshaft Position Sensor.
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