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Thread: P38 Cruise Control woes

  1. 9th June 2009, 05:43 PM #1
    Romulus
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    P38 Cruise Control woes

    Ok, its time to get serious about and see if I can't get it going, the cruise control on my P38.
    Now, I have replaced EVERY part of the cruise control circuit, checked the vacuum hose and it is still not working, any ideas?
    I can hear the relay coming in when I push the steering wheel buttons but for some reason it just will not engage.
    Is there a way to test it whilst in my drive way with the bonnet up?, thanks for any help.
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  2. 9th June 2009, 09:15 PM #2
    andrew e
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    check that the pedal switch is adjusted properly?
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  3. 9th June 2009, 10:35 PM #3
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    Scouse
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    I'm going through similar problems with mine - 10% of the time it works but the rest it doesn't.
    It started off not holding speed & a new pump fixed that straight away for a few months. Now it's just intermittent .

    Have you gone through the LR test procedure?
    I went through the whole lot & it passed everything so it's pointing to the CC ECU. Next drive, the cruise worked . An hour later, it didn't.

    My test voltage readings are withing spec (I believe) but I think they're too low (11.5v) so I'm going to bypass the BECM power output & make sure the system is getting full battery voltage.
    Scott
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  4. 10th June 2009, 01:49 AM #4
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    PaulP38a
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    Tend to agree with Scouse... I had exactly the same problem with the Cruise Control in my previous '95 HSE... I could hear/feel it trying to engage but it would not most of the time - replaced the Cruise Control ECU and it came good again.
    My toys, projects and write-ups at PaulP38a.com
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  5. 10th June 2009, 07:12 AM #5
    Romulus
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    I have already replaced everything, the pump, bellows, brake pedal switch, ECU, relay, checked the hose.....nothing left to replace :-).....
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  6. 10th June 2009, 07:29 AM #6
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    Scouse
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    Quote Originally Posted by Romulus View Post
    I have already replaced everything, the pump, bellows, brake pedal switch, ECU, relay, checked the hose.....nothing left to replace :-).....
    Ahh, so you've followed the backyarder test procedure .

    The cruise system gets it's power through the BECM. If there's a problem there, then nothing will work.

    Do you want a copy of the test procedure? It's quite easy to follow if you have a multimeter. PM me an email address if so.
    Scott
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  7. 10th June 2009, 07:42 AM #7
    Romulus
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    Quote Originally Posted by Scouse View Post
    Ahh, so you've followed the backyarder test procedure .

    The cruise system gets it's power through the BECM. If there's a problem there, then nothing will work.

    Do you want a copy of the test procedure? It's quite easy to follow if you have a multimeter. PM me an email address if so.
    isn't that the only way to repair?? ;-)

    yes, can you either pm me or describe it here, got a multi meter so no worries, thanks for that!
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  8. 10th June 2009, 10:58 PM #8
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    adm333
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    Scouse

    I would love a copy of that as well if you don't mind.

    Cheers
    Dave
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  9. 11th June 2009, 08:13 AM #9
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    willem
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    Quote Originally Posted by adm333 View Post
    Scouse

    I would love a copy of that as well if you don't mind.

    Cheers
    Dave
    That would be really useful, and I'd like a copy too! (You might as well post it up here!)

    Thanks

    Willem
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  10. 6th July 2009, 01:20 PM #10
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    MoodyBlue
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    Same as Willem.
    My Brother in Laws 97 (He just bought it) CC does not work and I am about to help (or hinder) him in getting it going.

    Cheers
    Jeff
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