Circuit/System Verification
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
- 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.
- 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.
- 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.