Circuit/System Verification
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the scan tool ECM PNP Switch parameter while shifting the transmission through each range. The reading should change between In Gear and Park/Neutral. (automatic only)
- If not the specified values, refer to PNP Switch Malfunction.
- Ignition ON, command the Starter Relay ON and OFF with a scan tool, or turn the ignition switch to the START position. The starter solenoid should engage and the engine should crank.
- If the solenoid does not engage, refer to STRTR Relay Malfunction.
- If the solenoid engages but the engine does not crank, refer to Starter Solenoid Clicks, Engine Does Not Crank .