Circuit/System Description
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.
The control module enables the secondary fuel pump relay when the ignition switch is turned ON. The control module will disable the secondary fuel pump relay within 2 seconds unless the control module detects ignition reference pulses. The control module continues to enable the secondary fuel pump relay as long as ignition reference pulses are detected. The control module disables the secondary fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and the ignition remains ON.
The control module monitors the voltage on the secondary fuel pump relay control circuit. If the control module detects an incorrect voltage on the secondary fuel pump relay control circuit, a fuel pump relay 2 control DTC sets.