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Thread: P38 Cruise control

  1. #1
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    P38 Cruise control

    hi all, I'm having a drama with my cruise control. Over the years I have had problems with the hoses splitting and it failing because of that. This time I had exactly the same symptoms yet I can't find anything wrong with any of the hoses. the switch lights up and I can hear a click when I press the button on the steering wheel. Is there a way I can find out what else could be wrong?. I know there are a few switches and relays but where should I start.

    Thanks in advance.

    Deano

  2. #2
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    Hi

    I notice mtb_gary in his magazine article said he spliced in a later model more reliable Cruise Control unit

    Mine is not working either

    If you take the drivers kick panel off and get to the end of the vacuum hose, in the absence of a vacuum pump you can suck on it while someone else watches the cruise control bellows. MNine passes this test but that is as far as I have gone so far.

    The brake pedal switch is a candidate for failure as well, not sure how to test it though

    Steve

  3. #3
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    Quote Originally Posted by TheTree View Post
    Hi

    I notice mtb_gary in his magazine article said he spliced in a later model more reliable Cruise Control unit

    Mine is not working either

    If you take the drivers kick panel off and get to the end of the vacuum hose, in the absence of a vacuum pump you can suck on it while someone else watches the cruise control bellows. MNine passes this test but that is as far as I have gone so far.

    The brake pedal switch is a candidate for failure as well, not sure how to test it though

    Steve
    Steve, the brake pedal test is straight forward. When you turn on the ignition do the brake lights stay on? If they do the switch needs resetting.

    PS it was Simon that did the creative part with the cruise control

    Gary

  4. #4
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    There are two brake pedal switches one for the cruise control and the other for the brake lights . The brake switch for the cruice control has a vacuum hose connected to it as well as a electrcal plug . I have the same problem with the cruise control not working just finished going through the long winded rave procedure. Everything checks out ok but still no cruise control so i am now going to try the ecu mod.

  5. #5
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    I found that even though the hoses look good, they tend to leak at the fitting. I suppose it is just the hose getting worn. If you can here clicking, the ecu should be working, and that would get me looking at the hoses. It could also be the pump, but I've never had any thing to do with them, always been the hoses, and the ecu which was changed. For $15 of hose, I would start with that, especially as you can hear the clicking. You could always block of the hose to the brake switch just to check that isn't the problem.

  6. #6
    Join Date
    May 2010
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    Spearwood WA
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    Talking

    Quote Originally Posted by p38driver View Post
    There are two brake pedal switches one for the cruise control and the other for the brake lights . The brake switch for the cruice control has a vacuum hose connected to it as well as a electrcal plug . I have the same problem with the cruise control not working just finished going through the long winded rave procedure. Everything checks out ok but still no cruise control so i am now going to try the ecu mod.
    I now have my cruise control working after fitting a D2 unit

  7. #7
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    .........
    You just need a bit of patience soldering all the wires and checking to make sure you have got them on the right pins . I made a patch cable instead of splicing into the original wiring
    Last edited by Homestar; 24th November 2014 at 06:49 PM. Reason: Quote deleted

  8. #8
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    Looks like I may need this mod as well, once I get the beast running nicely again that is!

    Steve

  9. #9
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    Quote Originally Posted by p38driver View Post
    You just need a bit of patience soldering all the wires and checking to make sure you have got them on the right pins . I made a patch cable instead of splicing into the original wiring
    Hi Mate

    Any chance of some details on the cable?

    It seems a few of us here need to do this mod

    Steve

  10. #10
    Join Date
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    If I can get hold of the connectors I could knock up a couple of leads

    .did you salvage one of the connectors from the old ECU or did you manage to source one?

    Steve
    Last edited by Homestar; 24th November 2014 at 06:50 PM. Reason: Removed name

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