Dynamic Test

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. 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 Fuel Rail Pressure Sensor parameter should increase with each command.

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