I have a 2006 mustang GT and my cruise control does not work correctly. After you have inserted a few times, no longer able to activate it. Just turn off and on the vehicle, the cruise control will resume only a few times.
Could you help me fix my problem. Thanks.
regards
Cristian
Your best bet , take it to a qualified repair shop . You have no idea how complex this is ?
Having a scan tool hooked up to check for DTC'S - diagnostic trouble codes should be the first step in the diagnostic procedure .
Powertrain Control Module (PCM) Diagnostic Trouble Code (DTC) Index
DTCs
Description
Source
Action
P0500
Vehicle Speed Error
PCM
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
P0579
Cruise Control Multifunction Input A Circuit Range/Performance
PCM
Go To Pinpoint Test C .
P0581
Cruise Control Multifunction Circuit High
PCM
Go To Pinpoint Test C .
P0833
Clutch Pedal Switch B Circuit
PCM
Go To Pinpoint Test D .
P1572
Brake Pedal Switch Circuit
PCM
Go To Pinpoint Test B .
P1703
Brake Switch Out of Self-Test Range
PCM
Go To Pinpoint Test B .
All other DTCs
-
PCM
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual to continue diagnosis.
Then reading up on how it works should be done .
Principles of Operation
The speed control system is controlled by the powertrain control module (PCM). The speed control system is designed to maintain a selected vehicle speed between 48 and 200 km/h (30 and 124 mph). The speed control system is controlled by the steering wheel mounted switches (ON, OFF, SET+, SET-, and RESUME), the stoplamp switch, clutch pedal speed control deactivator switch (manual transmission), and the speed control deactivator switch. The steering wheel mounted switches are hardwired to the PCM through the clockspring.
The speed control functions include:
Pressing and releasing the ON switch turns the speed control system on. Pressing and releasing the SET+ or SET- switch while the vehicle is traveling at the desired speed activates the speed control system.
Tapping the SET+ or the SET- switch while in the set mode increases or decreases the maintained vehicle speed by 1.6 km/h (1 mph) per tap, respectively. If either button is pressed and held, the vehicle speed continues to accelerate (SET+) or decelerate (SET-) until the button is released.
Pressing and releasing the OFF switch, or switching the ignition switch to the OFF position, turns the speed control system off. Applying the brake pedal puts the speed control system into the standby mode. Pressing the RESUME button when the speed control system is in the standby mode causes the vehicle to accelerate to the last set speed. RESUME does not function if the OFF button is pressed or if the current vehicle speed is below the minimum operational speed.
The clutch pedal speed control deactivator switch is used on vehicles equipped with a manual transmission. When the clutch pedal is applied with the vehicle speed control system engaged, the normally closed switch opens and signals the PCM to deactivate the speed control.
The speed control deactivator switch is provided as an additional safety feature. When the brake pedal is applied, an electrical signal from the stoplamp switch is sent to the smart junction box (SJB), which then sends a message to the PCM to deactivate the speed control system. Under increased brake pedal effort, the speed control deactivator switch opens and removes the voltage signal from the PCM input circuit, deactivating the speed control system.
Whenever the speed control system is engaged and active, a speed control icon on the instrument cluster is illuminated.
The inputs to the PCM are:
The outputs of the PCM for the speed control system are:
The speed control system throttle position is completely controlled by the PCM through the electronically controlled throttle body. Speed control electronics are contained entirely within the PCM.
When the speed control system is active, the PCM corrects for deviations in the actual vehicle speed by proportionally moving the throttle plate. The PCM modulates the throttle to minimize error between actual, and desired, vehicle speed.
The PCM strategy uses the throttle control for smooth accelerations.
The PCM sends a message over the controller area network (CAN) to the instrument cluster whenever the speed control telltale should be turned on or off.
In the event of an OFF command or a deactivation request from any source, the speed control system carries out a deactivation and immediately returns the throttle to the idle position.
The speed control system provides self-diagnostics. The speed control is disabled anytime an error is detected in the system. No cluster telltale or message center messages are displayed when faults occur. Fault codes are logged by the PCM.
An electronically controlled throttle system fault also causes the speed control system to be disabled and a warning telltale (wrench light) or a message center message is displayed.
Additionally, the following conditions cause the speed control system to deactivate:
Inspection and Verification
Visual Inspection Chart
Mechanical
Electrical
SOURCE: cruise control on 99 taurus
check your on and off button at the steering wheel.
use a multi-meter set in the ohm postion and see if there is conectivity as you push each button. you will have to take the button off the steering wheel but it will take
just a few minites. while your at it you can check the right side also.
the set-resume-coast.
SOURCE: 99 Mustang GT Cruise Control
What exactly is it doing or not doing for that matter. Check vacuum lines going to the unit and see if you have any broken hoses. I'll try to get a schematic to you. It's best if you give me your email address so I can send it to you.
SOURCE: Replace Cruise Control Switch in Steering Wheel
I am describing the procedure for the "On/Off" switch, I did not try the one you mention. Buy the switch anywhere ( about $15 ), then use a sharp tool ( small knife, screwdriver, anything ) to gently pry the old one from its socket. It is not glued or screwed in or anything, just squeezed tightly in the socket. Once the switch is out, pull the cable, connect it to the new one, insert back in the socket and press gently. No force necessary, it comes out easily.
SOURCE: cruise control won't work
Does the on light in the dash come on? If not, you may have a broken switch in the steering wheel which is a fairly cheap repair. Otherwise, the controls work through the Printed Circuit Board in your dash (your instrument cluster) and the problem could be as simple as a solder defect or faulty component. The problem is that no Ford Service Technician that I know will touch this and tell you that you need to replace it.
The instrument cluster is very easy to replace but may cost you a few more dollars than you want to spend. I would have someone with an electrical background check the cruise control switches in your steering wheel with a multimeter before going any further with this. Also check the wiring for resistance leading from the switch to the cluster.
SOURCE: 2004 ford sport trac - cruise control no longer works
This problem is most times caused by an open circuit in the rotating contact under the steering wheel, this part is called the clock-spring contact, it supplies a connection to the airbag and steering wheel controls like the cruise, horn and radio controls. I would check the fuse as well to cover the bases, it is fuse #9 in the passenger compartment fuse box, it is a 7.5 AMP
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