Data Display
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 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.