Recommended Procedure:

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Ford RV Cutaway, 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The engine must be at operating temperature.

Connect the diagnostic tool.
Key on, engine running.
Access and monitor the IPR and RPM PIDS.
Operate the engine at low idle speed.

If the IPR duty cycle is less than the maximum specification, go to the next step. If the IPR duty cycle is greater than the maximum specification, go to test 10e of the Hard Start/No Start Diagnostics and check for an injection control system leak.