Pinpoint Test Aa: Idle Validation Switch: Description
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1996 Ford RV Cutaway, 1996 Ford Pickup, 1996 Ford F-Super Duty, 1996 Ford Econoline, and 1996 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test when directed here by QUICK TEST. IVS provides PCM with a signal to verify when accelerator pedal is in idle position. Any detected malfunction of IVS will illuminate CHECK ENGINE light. DTC 0220 indicates throttle switch "B" circuit malfunction. DTC 0221 indicates throttle switch "B" circuit performance.