4x4 does not work 2005 f150 where is IWE solenoid located all the fuses are good
There is a service bulletin on this problem. A scanner would be helpful to diagnose this problem. Check for set trouble codes C1979 and C1980. If the codes are set in the computer memory, follow the procedure in the bulletin. I listed the Service Bulletin below.
INTERMITTENT IWE NOISE, 4WDH LIGHT AND/OR
4X4 SYSTEM INOPERATIVE, DTCS - C1979 AND C1980.
2006 Mark LT
Some 2004-2006 F-150 and 2006 Mark LT 4X4 vehicles built before 4/24/2006 may exhibit a noise in 2 wheel drive from the front Integrated Wheel Ends (IWE) and/or the 4X4 system being inoperative. The IWE solenoid may have ingested water and passed it to the IWE system causing water contamination in the vacuum portion of the system. A shorted IWE solenoid can set the codes C1979 and C1980. If either code is present, the 4WDH light will be inoperative.
Use the following Service Procedure to check and repair the 4X4 system.
Replace the IWE solenoid. Torque the new design bracket and solenoid to 62 lb-in (7 N.m). It will be necessary to remove the vacuum lines from each IWE down at the wheels to check for water being present.
If no water is present at the vacuum line at the IWE, install the new solenoid with bracket. Reconnect all vacuum hoses.
If water is present allow it to drain from the vacuum lines. Then follow the updated procedure outlined in 2006 Workshop Manual (WSM) on-line version, Section 308-07A, Pin Point Tests B21 and B22. These tests checks IWE leak rates with vacuum and will remove any residual water from the IWE. Reconnect all vacuum hoses.
If the IWE looses vacuum quicker than the specification suggests. Refer to Work Shop Manual (WSM), Section 204-01B for normal diagnostic procedures in the service repair manual.
IWE Solenoid part number is 6L3Z-9E441-A
IWE should be located behind the battery on the fire wall. Look for the vacuum lines going to the front hubs.
Last edited by TechHelp2 (6/14/2010 9:16 PM)
if that does not work any idea on what it can be thank you
Try this Service Bulletin first and see what happens. It is a known fix. If the problem continues, then supply us with as much information as you can on the problem and we can go on from there.