Question about 2003 Ford Expedition
CHECKED F5 AND F12 BOTH GOOD
If all fuses are good and wiring is good too, then there are still a few things that can be the problem. The easiest ones to check first is the vaccuum hoses that operate the diaphragm that moves the throttle. They could be unplugged, cracked, cut, etc. and any vaccuum leak on the system will at least hinder it, and can also prevent it from working. If all that is fine, then you probably have a faulty sensor, solenoid or switch somewhere. The brake pedal switch is used in the system to disable it when braking, and some models have 2 switches on the pedal. One for the cruise control, and one for the brake lights. So if the switch is stuck the cruise will think ur braking and prevent it from working. The solenoids that controls the vaccuum going to the diaphragm can also be dead and not open the vaccum ports when needed, so the throttle won't ever move. These are easy to test usually with a multimeter, since solenoids are just coiled wired that make a metallic shaft move, so there are only 2 terminals on them and you should have some resistance between the terminals if they are ok. If you have direct continuity without even a little resistance, then the coil is shorted, and if you have no continuity at all then the coil is cut open, and in both cases you will have to replace the solenoid. The vehicle speed sensor is also used for the system of course, and there are a few here you will need to check, and there are usualy one or 2 on the differential, and in most cases each of the ABS wheel speed sensors will also be taken in account, which also means the ABS unit's computer needs to be functionning correctly. So if you have a brake or ABS light on or are having trouble with the ABS while braking, this might be your problem. Of course the transmission computer usually plays a role in this too and needs to be functionning correctly, but in these cases it becomes too hard to figure out unless you have alot of equipment and knowledge on those. So i'll cut the rest short and just say that if you have a check engine light on, then you have a problem that quite possibly will prevent the cruise from working, so go to a garage or friendly mechanic to have him/them get the codes out for you so you can try and fix the problem, and hopefully your cruise control will work after that. Hope this helps! :)
Posted on May 24, 2014
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Posted on Jan 02, 2017
SOURCE: cruise control does not work
first, check the relay... but second, i had an 04 f150 heritage and i believe there was a recall on the cruise control unit for certain model yrs... i think it was 02-04... have your dealer check it out and they will replace it for free
Posted on Jan 17, 2009
I had this same Problem and it was a simple vaccuum hose leak connected to the cruise control module. Try replacing this small hose.
Posted on Mar 01, 2009
an easy answer would be a vacuum line with a hole but with this late model and the fact its a ford i would think electrical problem. ford likes to use relays in all its electrical apps. if not the switch itself maybe a relay. the problem is finding which one. i go down to the auto parts and see if i can find info on the relays i can see or take it to a shop u can trust and have it diagnosed
Posted on Apr 23, 2009
I'm having the same issue with mine. Just checked both fuses #5 and #12 under the dash, but both are fine. Can't find Relay #302 for the speed servo. 2003's aren't listed in the recall. Ugh!
Posted on Dec 11, 2009
really tough to do on the net but first we need to know about any codes...
Hold speed control OFF button, and turn ignition switch to RUN position. CRUISE indicator should flash once to indicate successful entry into self-diagnostic mode. If CRUISE indicator does not flash, start procedure over. If CRUISE indicator still does not flash, repair system by symptom there might be some switch concern
If CRUISE CONTROL indicator flashes once followed by 5 additional flashes, replace speed control servo/actuator.
Release speed control OFF button. Within 5 seconds in entering self-diagnostics, press speed control ON button. Press remaining speed control buttons in the following sequence; ON, RES, COAST and SET/ACCEL.
As each button is pressed, CRUISE indicator will flash.
Wait until indicator light goes out, then press next button. After sequence has been completed, indicator light will flash to indicate test passed or failed. With the codes we can then better diagnose your concern
Immediately after static test has passed, actuator performs a dynamic test by automatically operating throttle .04-.40" (1-10 mm). Observe throttle movement to witness any sticking in cable or linkage. Ensure throttle returns properly. Turn ignition switch to LOCK position. If self-diagnostics do not pinpoint fault there is more we can do but tough over the net
Posted on Mar 27, 2010
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