Circuit Description
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
The glow plug system is used to assist in providing heat required to begin combustion during engine starting at cold ambient temperatures. Glow plugs are heated before and during cranking, as well as during engine operation. Engine Control Module (ECM) controls glow plug ON times by monitoring coolant temperatures and glow plug voltage. This system check will check glow plugs and Glow Plug Feed circuit coming from relay/controller.