ok, surely some has had a cruise issue and gotten repair. I know it's a common problem , just by the countless messages in all the forums, but on one seems to have an answer. Someone must of had it fixed and is just not posting, come on and share with the rest of us on how it was remedied. PLEASE!!!!!!!

IMnuts

 

bump

 

I had a buddy with a 04 4.7L that had a vary similar problem 2 weeks ago. it was a broken clock spring behind his drivers airbag. but also his airbag light was on and his horn didnt work. might be your problem, thought i would throw that idea out there.

 

From the Chilton. The cruise (speed) control system is electrically actuated and vacuum operated. Two seperate switch pods on the steering column cover all necessary functions: ON, OFF, RESUME, ACCELERATE, SET, DECEL and CANCEL. To operate the speed control system, consult your owner's manual. The speed control system includes the multi-function switches on the steering column, the servo and solenoids, the speed control cable and a vacuum reservoir. When the speed control servo receives a SET input from the switch, the vent solenoid is actuated while the vacuum solenoid is " duty-cycled". This action causes the diaphragm inside the servo to move, pulling on the speed control cable and opening the throttle. When the vehicle its target speed, the vacuum solenoid is deactivated so that the diaphragm holds, and the cable is held. When the vehicle is above target speed, the vent solenoid is duty-cycled, while the vacuum solenoid is still deactivated to maintain the target speed. CRUISE CONTROL INOPERATIVE: Blown fuse, short or open in the cruise control circuit, faulty brake or clutch switch, leaking vacuum circuit, faulty cruise control switch, faulty stepper motor, faulty transducer, faulty speed sensor, faulty cruise control module.

 

make sure your cruise linkage to the throttle linkage is tight, make sure the cruise vaccum lines are not leaking.. these is a big box under the window whipper cowl you might have to check, also make sure that the cc motor is plugged in. I have an extra motor i took out of my truck, i dont use cc and my AEM had me relocate it anyways so i just took it all out..

if you want it let me know.. ill send it to you for 20$ shipped, also you will have to use your own linkage, as for the one one on mine the little plastic peice that connects to the thorttle linkage area came off..

 

Guys
thanks for the suggestions. I'm thinking along the lines of electrical as it was working and all of a sudden it doesn't work as in the cruise light doesn't even come on. so, it can't be anything to do with Vacuum as the light would come on but the the cruise won't work or would would work but errattic. So, I'm thinking it's either the the switch on the brake peddle or the clockspring. If however it was the clockspring then the Airbag light and the horn should be faulty as well, but they are working fine so it has to be in the brake switch. But, if I dissconnect it and jumper it out you would think that would allow the cruise light to come on, but it still isn't working. I'm trying to fix this without replacing everything. I'm still stumped!!!!!!!!!!!

Thanks for the suggestions though, they are really good ones for anyone else that might have an issue with their cruise.

IMnuts

 

I'll be really curious when you finally fix it since I have the same problem. I wonder if your switch on the steering wheel went bad? I've done tests on my switches and at the pcm with my ohmeter so I know mine are good, but the Dodge tech said the pcm wasn't recieving the signal for some reason. Didn't have the money so I didn't have them look into it more. I've looked at every wiring diagram, and tested anything I can think of, even replaced the brake switch, all with no luck. Vacuum is fine too.

 

The only thing I've found recently but haven't got around to looking into yet, is on Rockauto.com under electrical they have a heading for cruise control sensor. There's one sensor under there from AC Delco, but it's just the auto tranny output speed sensor. But if you look under automatic transmission on Rockauto, they have a heading for speed sensor, and they list two other output tranny speed sensors by Standard Motor products, but not the AC Delco one. So I don't know if there's a difference in them or not. I doubt it. Anyway I have read where the RWAL brake speed sensor that's mounted in the rear axle will serve as a backup if the output speed sensor fails so the tranny will still shift normal. But I've also read that if the output sensor fails it will throw a CEL. So I don't know if somehow that sensor could be bad to the point it will mess the cruise up and not throw a light, or if there's a communication issue between the transmission control module and the powertrain control module. I've found electrical diagrams that show the output speed sensor only sends a signal to the pcm. Maybe the pcm then sends the signal to the tcm. I don't know, I'm so lost with all this right now I don't know where to look anymore.

 

Yellowjacket99
I would think it was a speed sensor if my CC would come on but not work, but the problem is, it doesn't even come on. Which would lead me to think it's either the switch,clockspring or even the PCM. If you look at it logically. if the switch was faulty, then it would/should work intermitently and would it just up and quit? If it's the clock spring, then why is it that only the CC is effected and not the airbag or horn? I'm really thinking it's the PCM, as it controls the CC completely, from Acknowledging to turn it on to the handling of the speed bassed on the sensor inputs. Not sure how much a new PCM is but I guess if I want my Cruise to work, then I guess I'll have to invest some money. Will let you know what. if anything happens.

IMnuts

 

I guess it depends on when the pcm monitors other circuits as far as if it would even turn on or not. When you push the on button, the pcm reads that, sends power to the brake light switch, and if the brake is not being pressed the switch lets the power go to the cruise control servo. When you push the set button the pcm reads that, monitors some other circuits, and sets the speed. If it only monitors other circuits when you push the set, accel/resume, decel/coast buttons, then yes, the cruise should still turn on when you push the on button if a sensor were bad. But if it monitors other sensors when you push the on button, then it might not turn on at all. If you have a multimeter you can check the signals at pin 32 on connector 3 at the pcm. That will tell you if your switches, clockspring, or wiring between them and the pcm is bad. Each switch has a different resistor and will give a different reading, but I'm not sure whateach value should be.