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Cruise control
- Mar 25th 2024
The cruise control does not work on my newly purchased 928 S4 87. Any ideas.
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Hallo Scholar, Schau mal hier: Cruise control [advertisement] Dort wird jeder fündig! :-)
If you are lucky it is a vacuum leak, if you are less lucky you will have to have the control unit overhauled. But before you do that, you can check the actuator to see if it holds vacuum. Greetings Thilo and congratulations on the S4
Could be a problem with the vacuum. Easy to check.
Or with the control unit. There are repair instructions on Rennlist
- Mar 26th 2024
Hi, does the 87 still have a system with a vacuum regulator?
Hi, according to the PET, the 1987 S4 still has the cruise control unit 928 617 127 00 with vacuum control.
It is hidden under the center console at the very back bottom...you can't really get to it easily.
This control unit is almost always broken, unless it has already been repaired.
The cruise control vacuum system is usually OK.
If the vacuum regulators of the heater are leaking, this also affects the function of the cruise control, so when testing, turn the heater controls all the way to the left. Greetings Thilo
Thank you all for the tips. I'll start looking for the error.
If the car has not even been checked properly, there are bound to be vacuum leaks!
The vehicle was regularly serviced. The previous owner only never used the cruise control.
My new acquisition from last year was also serviced regularly. This does not mean that the vacuum system is in order.
In my case, the pressure accumulator was disconnected and the central vacuum supply under the dashboard was disconnected.
After that, the cruise control worked again.
I found this after several months.
On the dynamometer and only 280 hp, then you already know that the mixture formation is not right.
In the meantime, not only customer service has been carried out but also "serviced", new injectors, ignition harness, fuel regulator, dampers,
complete HA rebooked, brakes, suspension struts overhauled etc.
Doors dismantled and slide rails replaced, door catch hinges, ZV servomotor in the passenger door.
New engine underride guard.
Bam, you've replaced €10,000 worth of parts and have a completely different car!
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CRUISE CONTROL NOT WORKING
- Thread starter redbaz
- Start date Jan 25, 2011
- Jan 25, 2011
Checked fuse for tail lights and cruise ok. Any ideas what the problem could be? My car is 1999 c2, with 65,000 mls tiptronic. Thanks in antisipation.
Richard_Hamilton
Pcgb member.
- Jan 26, 2011
Is the green cruise light coming on in the dash when you switch it on the stalk? That would show if the switch is working and it is getting power. Another possible problem is the brake light switch. Even if the brake lights are working, it doesn't mean the switch is OK. There are two contacts inside the switch, and only one is used for the lights.
- Jan 27, 2011
Green cruise is coming on will check brake light switch. Thanks again Richard.
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5 Reasons Why Your Cruise Control Stopped Working
- Updated: March 15, 2023
It would be difficult to find a vehicle on the road today without cruise control. This invaluable feature makes driving long distances easier but can also cause trouble when it malfunctions. Understanding the reasons your cruise control stopped working ensures that you can get the problem fixed quickly for a more enjoyable ride.
While this fault can cause issues with the cruise control system itself, there could also be an effect on the acceleration of your vehicle. That’s why you want to have it looked at as soon as you notice a problem. Let’s take a quick look at the reasons your cruise control may have stopped working.
Reasons Why Your Cruise Control Stopped Working
The most common reason a cruise control stops working is due to a blown fuse or a defective brake pedal switch . It can also be caused by issues with the throttle control system or the ABS. In older cruise control systems, it can be caused by a broken vacuum line.
Here is a more detailed list of the possible reasons your cruise control is not working:
1. Blown Fuse
All electrical systems in the vehicle are controlled by fuses. Your cruise control system is attached to a fuse that can blow if there is a short circuit or fault. Without a good fuse, the cruise control system can’t work at all.
Thankfully, it’s not difficult to find and replace a blown fuse. Look in the owner’s manual to find the fuse that corresponds with the cruise control technology.
2. Defective Brake Pedal Switch
The brake pedal switch is responsible for turning the brake lights on and off based on the pedal position. Cruise control systems are designed to disengage whenever your brake pedal gets pressed.
Because the cruise control is wired into the brake pedal switch, any fault can cause it to stop working. When the brake pedal switch malfunctions, the car believes the brakes are engaged, causing the system to turn off automatically. Not only that, but your car’s brake light might also be stuck on, leaving confused drivers in your wake.
3. Malfunctioning Speed Sensor
Speed sensors are located on every wheel or differential. The purpose of these sensors is to monitor the speed of the wheels to determine if traction control is needed.
The speed sensors are also part of the cruise control system. When a sensor fails, the cruise control can stop working and the speedometer might act strange as well.
If there is an issue with a speed sensor, it will often show with an ABS warning light or a check engine light on the dashboard.
RELATED: 3 Symptoms of a Bad ABS Wheel Speed Sensor
4. Electrical Issues
The cruise control system is electronic, with many components working together to make the system operate. If the cruise control fails to work, you want to check the wiring harness and associated connectors for a fault.
You also need to ensure that the voltage source is supplying enough power to the system. Even the smallest fault can cause defects with the cruise control. In many cases, there can be an issue with the cruise control lever or buttons causing the cruise control to not engage.
If your cruise control buttons are located on the steering wheel it could also be caused by a bad clock spring, which is located behind the steering wheel.
Check the system with an OBD2 scanner to look for any trouble codes related to the cruise control.
RELATED: 5 Symptoms of a Broken Clock Spring, Location & Replacement Cost
5. Damaged Vacuum Actuator, Hoses or Cable (Older cruise control)
If you drive an older vehicle with cruise control, you might have an issue with the vacuum actuator or the cable that connects to the throttle. If there has been damage done to the vacuum hoses or the actuator, the cruise control will stop working altogether.
Additionally, the cable linking the actuator to the throttle must be in good shape. If it has been broken, the cruise control will fail.
What is Cruise Control?
Cruise control is a feature that is used when you are traveling at a consistent speed. Cruise control was first introduced for automobiles in the 1950s. However, it took many years before it became a staple in the modern vehicle.
This electrical system allows you to set a predetermined speed and take your foot off of the gas pedal. If you are on a long drive, there is less fatigue because you don’t have to try to maintain your speed. Cruise control can also benefit fuel economy because the vehicle uses less fuel when traveling steadily.
In newer cars, you might be able to find adaptive cruise control , which is a smart technology. Adaptive cruise control allows you to travel at a predetermined speed, but it also helps to maintain a safe distance from the vehicles in front of you with the help of sensors. With conventional cruise control, you need to take over when the car in front of you slows down, but that’s not the case with adaptive cruise control.
There are also vehicles nowadays with not only cruise control, but fully self-driving vehicles . We will most likely see much more of this in the future.
Cruise Control Repair Cost
The cost to repair your cruise control system depends on what caused it to fail. If you need to replace a cruise control or brake switch, you might spend between $125 and $350, including parts and labor. However, the cost to change a fuse is only a few dollars and you can perform the replacement yourself in just a matter of seconds.
On the other hand, when something major fails, such as the actuator, you could be looking at a much higher repair bill. In some vehicles, the cost to replace a cruise control actuator can cost more than $700. These costs rise if you drive a luxury vehicle or one that is difficult to get parts for.
It might not seem immediately important for you to fix the broken cruise control, but this defective system can affect other performance aspects. You could start to notice issues with acceleration or have trouble with the speedometer. To play it safe, it’s always best to have the cruise control repaired as soon as you notice a problem.
Is there a fuse for the cruise control?
Yes. If the cruise control is installed from the factory, you should check your car’s owner’s manual for the fuse location. If it’s an aftermarket cruise control, you’ll need to follow the wires to find the fuse.
Does the brake switch affect the cruise control system?
Yes. The brake switch affects the cruise control system. The brake switch sends a signal to the cruise control system to let it know when the brakes are being applied for the engine to know when it should stop accelerating.
Will the cruise control work if the check engine light is on?
The cruise control function will be disabled when the check engine light is on in most car models, even if the cause of the check engine light is not the cruise control itself. This is mainly due to safety reasons.
Can a vacuum leak affect cruise control?
Older vehicles use vacuum to control the throttle for the cruise control, and in this case a vacuum leak can heavily affect the cruise control. However, modern cruise controls are fully electric and in most cases will not be affected by a vacuum leak if the check engine light is not illuminated.
Although many people may think that the cruise control system is unimportant and not worth spending money to repair, the problem can be caused by a faulty part that will affect the engine’s performance or durability. Therefore, it is best not to ignore the problem if your cruise control is not working without first diagnosing the car properly.
If your cruise control still isn’t working after trying all the tips in this article, it’s probably time to take it in for a professional opinion from a mechanic. It may be a more serious problem that requires replacement parts or repairs. In the meantime, drive safe and enjoy the open road!
Learn more:
- Brake Lights Not Working But Tail Lights Are? (How to Fix)
- Tail Lights Not Working But Brake Lights Are? (How to Fix)
- Brake Lights Stay On? (5 Causes & How to Fix it)
Categories: Electric , Troubleshooting
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LEOS928. Sounds like your Cruise Control Box is going weird. It's a silver box right on the center hump behind the Center Console. It's kinda tucked in but I think you can gain access by just removing one of the side panels. You can open them up and check the circuit board for any obvious damage. Could be corroded contacts too at the plug.
Connect terminals 8 and 12. There should be voltage. Pulling back on the cruise control lever (cancel) should go to 0 volts. Terminals 9 and 12 should have 0 volts, but pushing the lever forward (set) should show voltage. Terminals 10 and 12 should have 0 volts, and voltage when pushing the lever down (repeat).
push console as far towards passenger side as possible without damaging under-dash wires. This exposes the tunnel access hole to the switch. remove the 2 10mm nuts holding the switch mounting plate to the floor of the tunnel. Note bolt pattern for reinstall. pull plate and switch out through tunnel access hole.
The cruise control does not work on my newly purchased 928 S4 87. Any ideas. Chris. Forum. Recent Topics last 24 hours; ... Porsche Centre. DIGITAL. Login or register; Search; This Thread. Everywhere; ... Forum. Porsche Models. Porsche 928. No advertising? Premium Membership. Cruise control. Scholar; Mar 25th 2024; Register NOW, participate ...
Expert Answer: Typically the connector located in the spare tire compartment causes a non-working or intermittent speedometer on the 928. A quick disconnect and reconnect usually cleans the connections and restores smooth operation of the speedometer.Your cruise control problem is usually a faulty cruise control amplifier assuming your trying ...
The most common reasons a Porsche 928 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems. 0 %. 10 % of the time it's the. Control Module. 0 %. 10 % of the time it's the. Sensor. 0 %. 80 % of the time it's the.
My cruz control will not work. The local international auto shop has replaced if i understand it right all parts that work the cruz control. ... The Porsche 928. Back; Model Info. Back; 1978 -1982; 1983 -1986 S ; 1987 - 1991 S4, GT; 1993 - 1995 GTS ; Option Codes; Engine Types by Year and Model; Wheel Options; Production Runs. Back; 928 ...
1990 Porsche 928 Cruise Control Not Working? RepairPal will help you figure out whether it's your Control Module, Sensor, Throttle, or something else. 1990 Porsche 928 Cruise Control Not Working
There are a few different reasons why it might not be working. The first possible reason is that the brake pedal is going. As you probably know, even a slight touch of the brakes will cause the cruise control to disengage, so obviously a malfunctioning brake switch will make it tough to use cruise control. Another reason is that a fuse could be ...
Intermittent hard starts, rough idle, poor performance, and bad gauge readings are all signs of bad ground points. Make sure the battery terminals are clean as well as the ground straps. Oxidation and corrosion can cause many electrical issues. There are also a lot of sensors in the 928 which the car relies on to gather signals.
1999 Porsche 996. Section 27, pages 10-13 of the WSM, to be precise. The Cruise Control (aka tempostat) amplifier is inside the center console, You remove the left carpeted cover (to the right of the passenger's right knee) and I think there are two or three bolts (and I think they were an odd size, like 7mm) which will release the amplifier.
Testing the actuator in the car and on the bench, then open it up to see how it works
The Cruise control does not work at all now so I think the vacuum is screwed up with that tee valve. At least according to the threads I have seen on both issues. More as I know it - right now I need to verify if the new relays fix the start issue, if not I am going to look to the 14 pin connector on the passenger side and the yellow wire that ...
CRUISE CONTROL NOT WORKING. Thread starter redbaz; Start date Jan 25, 2011; R. redbaz New member. Jan 25, 2011 #1 Checked fuse for tail lights and cruise ok. Any ideas what the problem could be? My car is 1999 c2, with 65,000 mls tiptronic. ... Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations ...
The issue is most likely a bad switch, or the cruise control unit. But 1st, check Fuse #B7 to be sure. If the fuse checks out, then you're going to need a DMM and a wiring diagram to make the necessary checks to narrow the issue down to either the switch or control module. You will also need to pull the steering wheel in order to remove the ...
well the cruise control on this car has never worked - i might drive it out to california this summer so i'd sure like to have one - i've tested all
iconoclast. 3973 posts · Joined 2015. #9 · Oct 21, 2018. rigelt is correct. You must push in that button on the end of the stalk to have the CC "READY" to operate. Then you just do not touch that button again. CC will not actually start working until/unless you set a speed by moving the stalk FW & back.
It can also be caused by issues with the throttle control system or the ABS. In older cruise control systems, it can be caused by a broken vacuum line. Here is a more detailed list of the possible reasons your cruise control is not working: 1. Blown Fuse. All electrical systems in the vehicle are controlled by fuses.
If the motor is old and damaged, the whole power window system of the Porsche 928 gets crippled. If one of the windows is static when others move, it could be a motor problem. If you also test the window relay with a voltmeter and it has power, you can narrow the problem to a faulty motor. Also, if the Porsche 928 window switch indicates low ...
hi i have a 1978 928 Porsche can any one tell me how to work out the cruise control or how tocheck if it is working also were does this part is in the . Pelican Parts Forums ... Pelican Parts Forums > Porsche Forums > Porsche 928 Technical Forum: cruise control help? User Name: Remember Me? Password: Register: Garage FAQ: Community ...
Replied by stepson on topic Won't start. Tim, Start relay is XIV (fifth from the right on the top row) - standard 53 relay. Fuel injection relay XVI (fourth from the right on the top row) 928-615-119-00 - (specific relay only) Fuel pump relay XVII (bottom row next to the double wide relay at the far right) 928-615-113-01 (specific relay only ...
My speedometer, odometer, and cruise control do not work. I decided to start with the sending unit. Directions I found said to use and ohm meter and rotate one of the the tires and it should open and close a few times a revolution. I hooked up my meter and found it to be working. ... '79 Porsche 928, '00 Porsche Boxster, '86 Porsche 944, '04 ...