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Richard Mansell quotes from a Jaguar publication describing the changes for the model year: The V12 models now feature the Hella speed control system as fitted to the pre MY 3.
This gives more logical layout, more accurate control of speed, the addition of a cancel function.
As of now, this book only addresses the pre cruise control. Thanks for the following procedures for troubleshooting the Jaguar cruise control system go mainly to Tom D. An electrical signal from the drive train provides the signal about how fast the car is going.
On early XJ-S's there was a dedicated sending unit near the input flange on the differential unit. Later XJ-S's split a signal from the speedometer transducer on the transmission. On still later models, reportedly the transducer is built into the differential unit itself. The signal is processed by the cruise control electronic speed control unit.
Within the bellows assembly are two solenoids, one which normally cruise control off vents the bellows to atmosphere and the other which normally seals off the vacuum line from the intake manifold.
The vent is sealed and the vacuum line is opened, and the resulting vacuum within the bellows pulls the cable, applying throttle. The speed control unit modulates the ground connection of the vacuum solenoid to apply the proper vacuum to maintain a constant speed.
As the result of a recall, there is yet another back-up device installed in the vacuum line to the bellows unit. This device is designed to seal the vacuum line and vent the bellows unit in addition to the solenoids.
If the cruise control is adjusted correctly, when the set switch is pressed the system will maintain the speed the car was doing at the instant the button was pressed. If adjusted incorrectly, it will maintain either a higher or lower speed. Hence, the test procedure is drive the car on a straight and level road and press the set switch, allow the speed to settle about ten seconds, and press it again.
If adjusted properly, it can be set over and over and still maintain the same speed.
If incorrectly, the repeated sets will result in gradually higher or lower speeds. If adjusted incorrectly, adjust the speed control unit until correct; it is a simple matter to have the speed control unit hanging under the dash it is located above the passenger side footwell and the necessary tools along for the test drive, and possibly even an assistant driving.
Although the repair manual describes a method of adjusting the cruise control, some of these units have no obvious adjustments. If you pry the box open, however, there are two adjustable pots on the circuit board.
The one to adjust is the one in the corner, farthest from where the wires enter the box. The adjuster is very sensitive; it is difficult to move it a small enough increment.
Each solenoid should register ohms. You should hear a click. You should hear another click. This verifies that both solenoids are moving.
You should be able to move the bellows. If you can't seem to suck anything, the vacuum solenoid isn't opening or the hose is kinked or plugged. If you seem to suck air easily without accomplishing anything, either the vent solenoid isn't closing or the assembly is leaking.
The following comments apply to the older cruise control actuators that had a bellows that looked like a bellows, and a flat metal disk that the cable attached to.
Newer cars use a different actuator, and some even attach directly to the bellcrank -- a no-no with the older throttle cable design. This cruise control actuator can be disassembled easily. Remove one bolt at the front end and disconnect the throttle cable from the disk at the rear end don't lose the little cable attachment thingy!
Then peel the bellows away from the disk the cable attaches to, and away from the solenoid housing the same way. These units seem to have several common failure modes. The first and most obvious is that the bellows leaks around the edges where it snaps over the metal disks; even a small leak is enough to render the system totally inoperative.
If this problem is suspected, it is a fairly simple matter to peel the bellows off at both ends, apply some silicone sealant, and reassemble. Another common problem is the bellows itself develops a tear or leak. You can easily check if the rest of the system is operational by patching the leaks, using a bicycle tire patch kit, tape, or whatever.
It may not last, but it will tell you if the rest of the system is OK. It has been suggested that using Son Of A Gun or some similar substance on the bellows may help protect the rubber from aging.
Gregory Andrachuk describes repairing another failure mode, sticky solenoids:The Throttlemeister is a mechanical cruise control for motorcycles. We have been around for 25 years providing relief for motorcycle riders across the world.
Cruise Control. If you experience any difficulties with this website, please contact the nationwidesecretarial.comter. The Cruise Control Store is proud to offer Chevrolet, Buick, and GMC cruise control kits. Chevrolet, commonly referred to as Chevy, has been around since , and is known for a number of different models including the Impala, Corvette, Camaro, Tahoe, Silverado, and more.
Experience in a Book Cruise Control. PRE VS. ON: Richard Mansell quotes from a Jaguar publication describing the changes for the model year: New cruise control: The V12 models now feature the Hella speed control system as fitted to the pre MY coupe in place of the AE Econcruise system. Product Description pressure and then sends a signal that disengages the cruise control.
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