Data Display
WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The scan tools input display function can be helpful in determining if the EHPS module is receiving the correct input status. This can assist in determining if the EHPS system is actually receiving ignition 1 voltage.