Dynamic Test

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

Engine idling, command the Fuel Pressure Control to Increase with a scan tool. The Actual Fuel Rail Pressure should increase with each command.

If the Actual Fuel Rail Pressure does not increase with each command, replace the high pressure fuel pump.