Static Testing

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: You must perform the Circuit/System Testing first.

Ignition OFF, remove the PSM from the valve body. Refer to Pressure Switch Manifold Replacement .
Test for resistance between the PS1 circuit terminal X and the metal base of the PSM. Resistance should be greater than 10 K ohms. If not, replace the PSM.