About a year ago i had the transmission replaced, then about a month ago, i replaced the main relay and disconnected the cruise control box. The first time it turned off on me, i put it in reverse, it turned off, and 5 minutes later, it turned on. The second time, it turned off on the freeway, then a cop pushed my car onto a little street, i struggled with the car, and it turned on about after an hour. It turned on when i connected the cruise control box. I thought it was my problem because i drove it for about a week no problem, and it turned off on me again on the freeway, so a city tow truck towed it off the freeway, and as soon as he put my car down, it turned on, and i drove home. I'm thinking it could be the transmission computer, but its just a guess. Any help would be appreciated, thanks.
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Try from Servo control follow connection To I beleive Transmission casing . Look for Burnt wiring / frayed / damaged ...Cruise should maintain speed signal Like speedo cable . Computor management black box / ECM may have direct control so Look for engine bay fuse boxes = 2 under hood . More fuses ++ relays 2 check inside cover is diagram of size + what it controls . A Reset 2 ecm may help by disconnecting Battery - Let sit 30 mins.. Older models + 4 wheel drive Trans has Gear wheel of plastic 2 count revolutions as speedo cable does . If said wheel teeth have worn out then Cruise counts incorrect or fails 2 activate . If you replaced brake pedal Light activation switch then be sure brake Tail lights DO work if not the cruise will fail as brake pedal is part of safety feature to turn it off in emergency disconnect . The signal light Stalk that Turns off L / R signals is Common Item 2 wear out BUT it also controls Turning on cruise or setting ...IF you have Steering wheel on / off / setting control - then issue can be frayed / cut wires due 2 steering wheel movement ....solutions remove wheel BUT 1 st disconnect Air Bag Fuse then wheel and search connections .....Good Luck ...
Since there is no throttle cable, there is no "cruise control" fuse. The fuses used are #7, 9,and 13 in the under hood fuse/relay box and #18 in the under dash fuse/relay box. The most common failure is a bad brake pedal switch. Does the cruise control main switch "on" light work when the switch is pressed? The gauge control module (instrument panel) and the PCM control the cruise control.
I have the same car, and had to replace mine, too. This website has pretty good instructions (and pictures) - it's how I found mine.
It's kind of a pain to get to - under the silver cruise control box, under the driver's dash. Once you screw off the cruise control box, you'll see the orange Main Relay. Mine needed resoldering - the same website has instructions for it, but it did no good. Just bought one for cheap off eBay, and kept it outside of the cruise control box so the soldering wouldn't melt off in the Texas heat again. Good luck!
I had the same issue happening with my 92 accord lx. I replaced the main relay and the issue was resolved... Was it the relay under the dash and hidden by the cruise control box you replaced? It is located under the drivers side dash, tucked WAY up there behind the cruise control box. This relay controls both the spark delivery AND the fuel pump.
If this IS what you replaced, it is more than likely still an electrical issue since the syptom only occurs when it is hot. This means an electrical connection is expanding and not connecting when it is hot. If the relay was replaced, it is possible the ECU may be having issues.
Have you check your truck for the Cruise control recall that ford haves for this year of a truck. I own a 2001 Ford Expedition and they re-place a wiring harness on the top right of my Engine, close to the firewall. It have a fuse in line with it. The re-call stated that the cruise control can star a fire in the Engine if the wire's get to hot. So maybe your wire's already meted and are stopping the power from traveling to the unit.
Although I don't think the cruise is an issue for safety, reach in under hood , or in grille area and find your horn(s) and just pull the connector off them temporarily, so they won't blow & put fuse back in and see if cruise starts to work again. It's not unusual for circuits to be labeled wrong or not at all in fuse panels. Then you can turn your attention to horn problem.
Faulty product. I install cruise control for 6 years. One of the cables are hooked into the throttle and the other in the vaccuum actuator, since it is electronically controlled actuator, the object itself might be losing it's contents or frankly worded, is taking a nose dive. works much like a brake booster does.
Is it a PID system? (Proportional integral derivative system)
or is it just standard proportional?
That will play a factor.
If you just have one of those cheesy controls (cruise controls), than replace it, obviously it wouldnt of cost much. if it is not, check the actuator and replace it! Replace the Fuse, brush it with wire brush, clean up all connections.
You should be ready to roll!