Recommended Procedure (California)

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford RV Cutaway, 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Glow plug system monitor will start when glow plugs are commanded on for over 30 seconds and battery voltage is 10-14 volts. A glow plug DTC will be stored in Continuous Memory if one or more glow plugs are not being powered. Look very carefully for poor connections, burnt or loose fitting pins that will cause high resistance and set a DTC.

Glow Plug Monitor Self-Test, is a KOER functional test of glow plug system performed on demand with engine running and A/C off. PCM will activate GPCM which monitors glow plug operation. Accelerator pedal may be used to increase engine speed to increase voltage if needed. A fault must be present at time of testing for test to detect a fault. DTCs will be sent from GPCM to PCM through Standard Corporate Protocol (SCP) line, then output to scan tool.