Test Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.

AW1 PRELIMINARY DIAGNOSIS FOR DTC P2199

Connect the scan tool.
Retrieve and record all DTCs.

IS DTC P2199 PRESENT?

Yes	No
For DTC P2199 with other DTCs present, REFER to DIAGNOSTIC SUBROUTINES - 6.0L DIESEL , DTC chart for appropriate diagnosis. For DTC P2199 only, Go to AW2.	UNABLE to duplicate concern. ROAD TEST the vehicle and RETEST the system.

AW2 DIAGNOSTIC TROUBLE CODE (DTC) P2199

Possible causes:
- IAT sensor
- IAT2 sensor
- PCM
Key off.
Soak the engine overnight.
Connect the scan tool.
Key on, engine off.
Access IAT/IAT2 PIDS.

ARE BOTH TEMPERATURE READINGS WITHIN 10 DEGREES OF AMBIENT TEMPERATURE?

Yes	No
Go to AW3.	INSTALL a new sensor for the one that is not within range. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.

AW3 CHECK KOER IAT AND IAT 2 VALUES

Key on, engine running.
Access IAT/IAT2 PIDS.

ARE THE SENSOR READINGS WITHIN 40°C (104°F) OF EACH OTHER?

Yes	No
UNABLE to duplicate concern. Soak the vehicle overnight and RETEST the system. If no concern is found, INSTALL a new PCM. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.	INSTALL a new IAT sensor. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.