Glow Plug Relay: Testing and Inspection

The diagnosis of the glow plug relay is part of the "Control Module System" and starts with the "On-Board Diagnostic System Check." This will determine if the system is operating correctly. If the glow plug system is not working properly, the On-Board Diagnostic System Check will direct diagnosis to a Diagnostic Trouble Code (DTC) tree chart or to another system circuit. Refer to C-Charts/Computers and Control Systems. Testing and Inspection