Test 14: Low Idle Stability (ICP Pressure): Purpose
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This test is performed to determine if idle stability or low power is caused by a stuck or dirty Injection Pressure Regulator (IPR) or faulty Injection Control Pressure (ICP) signal.