Question about 2006 Jeep Grand Cherokee
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....
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.
if no. then the Cruise acuator or something else has jammmed
open the throttle. ( or any gross air leak to engine induction)
Posted on Mar 28, 2014
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Posted on Jan 02, 2017
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Oct 04, 2016 | 2004 Chevrolet Silverado 2500HD
The On/Off switch
The Resume/Accel switch
The Set/Coast switch
The TCC brake switch
The stop lamp switch
The throttle actuator control (TAC) motor
The vehicle speed sensor
Cruise Control Engaged
The cruise control system will engage and adjust the vehicle speed based on the activation of the following cruise control switches:
The cruise control switches are located on the multifunction/turn signal lever.
The powertrain control module (PCM) monitors the signal circuits of the cruise control switches in order to determine when to capture and maintain the selected vehicle speed. The PCM uses the throttle actuator control (TAC) module motor in order to control the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.2 L.
Ignition positive voltage is supplied from the 10 ampere HVAC 1 fuse to the cruise control switch via the ignition 3 voltage circuit. When the normally open cruise control On/Off switch is turned On, the switch closes and the PCM detects a high signal voltage on the cruise control on switch signal circuit. When the normally open Set/Coast switch is pressed, the switch closes and the PCM detects a high signal voltage on the cruise control set/coast switch signal circuit. To engage the cruise control system, turn the On/Off switch On and momentarily press the Set/Coast switch. The PCM will confirm that the cruise control enable criteria has been achieved. The PCM will engage the cruise control system and record the selected vehicle speed. The PCM sends a class 2 message to the instrument panel cluster in order to illuminate the cruise control indicator. Pressing the accelerator pedal, while the cruise control system is engaged, will allow the driver to override the cruise control system in order to accelerate the vehicle beyond the current set vehicle speed. When the accelerator pedal is released, the vehicle will decelerate and resume the current set vehicle speed. The driver can also override the current set vehicle speed via the Set/Coast switch and the Resume/Accel switch. When the cruise control system is engaged, pressing and holding the Set/Coast switch will allow the vehicle to decelerate from the current set vehicle speed without deactivating the cruise control system. When the Set/Coast switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily pressing the Set/Coast switch will allow the vehicle to decelerate at 1.6 km/h (1 mph) increments for each time that the Set/Coast is momentarily pressed, with a minimum vehicle speed of 37 km/h (23 mph). When the normally open Resume/Accel switch is activated, the switch closes and the PCM detects a high signal voltage on the cruise control resume/accel switch signal circuit. Activating and holding the Resume/Accel switch, when the cruise control system is engaged, will allow the vehicle to accelerate to a greater vehicle speed than the current set vehicle speed. When the Resume/Accel switch is released, the PCM will record the vehicle speed and maintain the vehicle speed as the new set vehicle speed. When the cruise control system is engaged, momentarily activating the Resume/Accel switch will allow the vehicle to accelerate at 1.6 km/h (1 mph) increments for each time that the Resume/Accel switch is momentarily activated, with the maximum acceleration total of 16 km/h (10 mph) over the current set vehicle speed . Momentarily activating the Resume/Accel switch, after the cruise control system has been disengaged by pressing the brake pedal, will recall the previous set vehicle speed that is recorded in the PCM.
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