Recommended Procedure:
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Check for poor connections or loose fitting pins.
NOTE:
Incorrect measurements will result if all glow plug connectors are not disconnected.
The glow plug monitor self-test is a KOER functional test of the glow plug system. The self-test is performed on-demand with the engine running and the A/C off. The PCM will activate the GPCM which monitors the glow plugs. The pedal may be used to increase the engine speed to increase voltage if needed. For fault detection, the self-test requires a fault present at the time of testing.