Question about 2004 Ford F150

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Why doesn't the light for my 4wheel drive high come on? 2004 F150

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  • lorider81 Nov 12, 2009

    The light isn't burnt out because it lights up when you turn the key on.It feels like its in 4wd.It is ESOF.

  • Steve S
    Steve S May 11, 2010

    Is the truck actually locking into 4Hi ? Could be a burnt out LED, but I would not suspect that on a '04 MY truck ( possible not probable ). Is the truck ESOF ( Electronic Shift on the Fly ) or MSOF ( Mechanical Shift on the Fly ) ?

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If fuses 11, 28, 29, 30 and 111 are all good and with the 4h & 4L indicators working at key on cluster self test, the only thing to check is the IWE ( Integrated Wheel Ends ) on each side for a vac leak, and that the vent is free of obstructions. ( vent is for the locked to unlock operation ).

Other wise the only place for the problem is with the Cluster itself. From your description the PCM is reading the ESOF switch change to 4H or 4L, and it shifts correctly, this leaves the return signal over the CAN bus to the cluster to turn the indicator lamps on.
This is why the check the check of IWE operation, the PCM might not be getting the indication that the front wheels are locked ?

Else the Cluster needs to be checked with a WDS ( Worldwise Diagnostic System ) tool at a dealer or higher end mechanic.
The Vehicle Communications Module needs to be installed to do the tests on the cluster.

Might be worth the time to check IWE operation ( mechanical and the vac operation ) prior to spending the cash.

Posted on Nov 14, 2009

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