Circuit/System Verification
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
With the scan tool installed, ignition ON and the Engine running, observe the scan tool ECM/PCM GEN-F Terminal Signal parameter. The parameter should read between 5 and 95 percent.