KOER On-Demand Self-Test: Description
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
KOER ON-DEMAND SELF TEST is a functional test of PCM performed on demand with engine running. Temperature is not a factor, but A/C must be off. A check is made on Injection Control Pressure (ICP), Exhaust Back Pressure (EBP) and Manifold Intake Air Heater (MIAH) systems. During this test, engine RPM will increase. PCM will first command ICP high and low, then command EBP high and low. A fault must be present at time of testing for KOER ON-DEMAND SELF-TEST to detect a fault. If a fault is detected, a DTC will be output at end of test when requested by a scan tool. Only a hard fault DTC will be displayed.