Question about Ford Explorer
Control track explorer lights flash
That flashing is a signal from the GEM computer that indicates a failure in the Control-Trac system. Typically it is one of the Hall-effect axle speed sensors (located in the t-case) that has failed. In the auto position on your model the system monitors relative front and rear axle speeds, increasing the period of engagement of the clutch pack in the transfer case to eliminate the rear moving faster than the front. If it gets to full-lock, for example, and the rear still seems to be turning faster then it reverts the system to 4WD (locks the transfer case in 4wd as it does in 4wd-lo) and flashes the lights to tell you of the problem (in 97 and later models it reverts to 2WD in the default, auto position). Some have reported cleaning the contacts on the speed sensors has helped, but you may want to get to a dealer if the problem persists. Watch that they dont automatically try to replace the computer or the transfer case. Usually it is just a sensor problem, which is relatively easy and inexpensive to replace. There is a shift motor on the t-case on these models, but it is only used to select 4wd-lo and yours seems to do that OK.
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Posted on Feb 24, 2012
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Posted on Jan 02, 2017
SOURCE: 4wd high 4wd low lights flashing
When the 4WD lights flash on and off,
this indicates that there are 4WD-related trouble codes in the 4WD
control module. Sometimes 4WD lights never illuminate.
The first step in diagnosing the system is to establish communication and retrieve trouble codes from the control module. After retrieving the codes, write them down, clear the codes and retest to see which codes are regenerated. False codes can be set if a component is disconnected when the key is turned on.
If the 4WD lights flash on and off, and no codes are found in the 4WD control module, try clearing the codes anyway. After a certain amount of key cycles, the codes will normally clear from the 4WD control module, but the module will not respond to commands until it is re-initialized by clearing the codes or disconnecting the battery to erase its memory.
If your scan tool will not communicate with the 4WD module, first verify that the scan tool has the proper software and the latest updates. If it does, then try another scan tool. If it still has no communication, the power and grounds that are supplied to the module will need to be tested. See if the scan tool will communicate with the other modules on the shared communication network. If they're OK, check the harness from the data link connector (DLC) for an open circuit to the 4WD module.
Posted on Jun 05, 2009
The clunking noise could be coming from three different areas. Either the front or rear differentials could make that noise along with the transfer case. I would initially be looking at the transfer case as the culprit since you mentioned the 4wd light coming and going. My thinking is that the 4wd engagement solenoid is malfunctioning and trying to bring in the 4wd, then releasing it. The only good way to check the function and noise for this is to put the car on a lift.
Posted on Apr 27, 2010
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