1990 Speed control circuit
#1
1990 Speed control circuit
Hey All,
I've got a problem with my cruise control and I cant find a circuit diagram. my car is Nov 89 built and has the bellows type actuator and has the SET function on the master switch on the console, not on the stalk like most diagrams I can find seem to show. The Resume switch is on the stalk. Does anyone have the diagram for mine?
I've got a problem with my cruise control and I cant find a circuit diagram. my car is Nov 89 built and has the bellows type actuator and has the SET function on the master switch on the console, not on the stalk like most diagrams I can find seem to show. The Resume switch is on the stalk. Does anyone have the diagram for mine?
#2
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Hoppy (04-25-2017)
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I've done all the checks outlined in the XJS book bar the bench testing of the control unit, everything looks OK,I've pulled out the bellows an resealed the rubber to the end plates. I lived up the solenoids. When vacuum testing I did get the bellows to move but just a little. I'm thinking I might try the bellows under motor vacuum and apply 12v to the solenoids to see if it pulls up the revs.
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My CC has not worked for some time either. during my reinvigoration project this past winter I did get a new control unit and lubed up the little servo motors. Installed the nit on the bellows and sealed both ends with Permatex. I haven't had a chance to test it yet. The speed sensor on the differential is something I hadn't thought of. I'll go there if my road test doesn't work. Thanks!
#12
There is a separate switch for the cruise disconnect, in addition to the brake switch. On one of my Series III sedans that switch stuck, so the signal to the cruise ECU was the brakes was on, thus the cruise wouldn't engage. Check that switch electrically and make sure it's behaving as it should. I think it's off the brake pedal, but I'm not sure about your year.
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BradsCat (04-30-2017)
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according to 'the book' the brake switches arent an issue on the XJS, and can be checked via a simple test at the ECU connector, mine checked OK. One of the first things I did was pull the hose off the unload solenoid -blue front right of motor - and busted the spiggot right off the solenoid...
Looks like US$150 min. I googled the Denso number off the solenoid and found similar units used on Toyotas/Lexus for 1/4 price. ATM i've run the vacuum line direct to the manifold to diagnose the CC issue.
Looks like US$150 min. I googled the Denso number off the solenoid and found similar units used on Toyotas/Lexus for 1/4 price. ATM i've run the vacuum line direct to the manifold to diagnose the CC issue.