KOER Glow Plug Monitoring Self-Test

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2005 Ford RV Cutaway, 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

Connect the diagnostic tool. Turn off all accessories. Turn the air conditioning (A/C) off. If the vehicle is equipped with a power take-off (PTO) system or auxiliary idle control, it must be turned off to carry out the self-tests.

NOTE: When running this self-test, the battery voltage must not decrease to less than 10 volts or exceed 14 volts. Make sure that the batteries are OK and the charging system is working properly. If necessary, apply the accelerator pedal to maintain system voltage.

Carry out the necessary vehicle preparation and visual inspection. Refer to QUICK TEST OPERATION.
Using a digital multimeter connected to the battery, monitor the voltage. It may be necessary to increase the RPM to maintain the voltage.
Start the engine.
Set the parking brake and place the transmission in PARK (automatic), or NEUTRAL (manual).
Refer to the manufacturer's manual for diagnostic tool instructions.
Select KOER glow plug monitoring self-test.
Follow the instructions on the screen.
Maintain the system voltage until the test is complete.
Record the DTCs and follow the appropriate pinpoint test.