Question about 2006 Jeep Grand Cherokee

1 Answer

Cruise control is working but when i set it to a certain speed it will not hold it & will just accelerate in an insane speed.

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  • pam sellers
    pam sellers Mar 28, 2014

    i can drive it with no problem, since i bought the car it never worked but didn't care since i don't use it but i'm gonna drive cross country so i want it fix. break pedal totally cancels cruise control. nothing has been done to it, went to a mechanic but he can't say whats wrong.

  • _-__-___-_
    _-__-___-_ Mar 29, 2014

    so the brake switch works, the contoller sees it, so is working and the Actuator released. so must be, the cruise accel, button stuck closed. (or the wire to it shorted to ground.) one way to prove that is defeat the accel button wire, Use only the set cruise button. (fix it or defeat it, 2 choices, that button.)

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  • Jeep Master
  • 20,706 Answers

I-6 4.0L or V8? 4.7L???????

thats not a good sign. not at all. NoT road worthy, at all.

pray tell. the brake pedal cancels Cruise , right.>?



sounds like Toyota Disease.?

floor mats hitting throttle pedal?



let me tell you that newer cars can kill cruise for 18 reasons.

but the older the car , the less reasons.

some do , only with brake switch cancel or neutral selection (man killer cars.)



you never posted what engine option is there, or transmission.



on the newer cars, if the TBW , throttle by wire fails.

cruise is rendered Inop.

and goes to limphome. (low speeds and cruise is dead..)



here is the FSM. see chapter called fueling....

http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service



btw all my early jeeps had this issue. with bad TPS.

1988 to 1999

my 08 , no.



all MAP based speed densty fuel systems at risk (by its nature)

to have excessive RPM.

any air leaks.

or throttle jammed open.

or vacuum leaks,

on the new cars its has a new check to see that that dont happen.

RPM - and manifold vacuum, do not match TPS angle.

in gringo that means the engine actions dont match your right foot.

i then drops , cruise, and then goes to limphome mode on all newer cars. my wrangler this happened beginning for 07, but its 3.8L V6.



the mech, would first makes sure the engine runs perfect

by driving. it , and then using a scan tool (rent one) and see if there

are any DTC error any where. a FULL SCAN.



first see page 50 , (FSM) fueling, figure 37]

see that, see those cables,

you need to find out of any of those are sticking.

as you can see the Cruise control has its own CABLE

so both it , the control actuator or the cable can stick.

these need careful, checking per the FSM.

sadly my FSM above has bugs (its not really mine, just my link)

has an error in the speedcontrol chapter, you can see it.



alldata.com has all this, log in and read.



the key to finding this, is.

does the brake pedal cancel it.

Y/n

if no. then the Cruise acuator or something else has jammmed

open the throttle. ( or any gross air leak to engine induction)



cheers./!

Posted on Mar 28, 2014

Testimonial: "hmmm... so what do you think is wrong?"

  • 10 more comments 
  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    i cant drive it, does the car drive perfectly , cuise off, Y/n if yes then you have a bad cruise acutator. its sticking, if true that can be fixed 2 ways, repace the actuator or , clean and relube the parts so they dont stick. some cars have 3 cables, throttle, Tranny kick down, and Cruise. any can stick. all cables can. and for sure rusty. that is there "THING" bad return spings? best if car runs perfect , then remove the cruise acutuator and inpect it, that is what i do first. inspection, and feel the parts and the action, its not something to tell,, we do this all mech. parts,

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    i have no idea what is wrong, id have to touch it. and do simple tests, here is a link, with no rumors, (many think the brake switch is bad, no it is not, it has the oppoosite effect)

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    http://www.jeepforum.com/forum/f13/cruis...

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    what has to be done is see if the servo sticks, if not, then it must be the controller going nuts/? or its inputs (its just a crude puter) see post 13 and 14. even a stuck CC accel button. The FSM covers all the tests , step by step.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    and 1 more time ,did the brake pedal cancel the CC going nuts ?

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    it must , or its bad, the brake pedal switch.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    as with all puter, bad inputs, bad actuator (ouputs) or bad controller.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    the Puter is inside the PCM so is just software in the same.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    the PCM is what watches speed, and brakes and sets the CC actuator .

  • pam sellers
    pam sellers Mar 28, 2014

    i can drive the car without a problem. break pedal totally cancels cruise control. i went to a mechanic but he cant say what is wrong with it.

  • _-__-___-_
    _-__-___-_ Mar 29, 2014

    http://www.jeepforum.com/forum/attachmen...

  • _-__-___-_
    _-__-___-_ Mar 29, 2014

    that is the schematic. of 96, and on a 96 cutting the wire is near impossible , they are shared, I dont have a cruise page, for your year. alldata.com has it. log in get it. find a way to defeat the accel button. on this 96 they use resistance to tell the controller what you did, making diagnosis harder.

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