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P38A Cruise Control repair....I hate this Ba$tard thing. ;-)

Discussion in 'Range Rover' started by DanClarke, Sep 8, 2019.

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  1. DanClarke

    DanClarke Well-Known Member

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    Nope! Cruise IS set in the BeCM features.
    Sadly, I have broken a previously working element while fault-finding this afternoon.
    The "Res" button is now no longer seen/reported by the CC-ECU to NANOCOM, whereas it was last week. BÜGGER!
     
  2. Henry_b

    Henry_b Well-Known Member

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    Whoops ;)
     
  3. RangeRoller dt

    RangeRoller dt Well-Known Member

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    XYZ switch okay? Fuses?
     
  4. DanClarke

    DanClarke Well-Known Member

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    As far as I can see, yes.
     
  5. Datatek

    Datatek Well-Known Member

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    Un-set and then re-set cruise in the BECM, might just make a difference. It does sound as though your car may have P38 disease, that's corrosion in the connectors at the BECM, usually due to leaking O rings.
     
  6. JUKE179r

    JUKE179r Well-Known Member

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    Also on your Nanocom, make sure you have it identified for a RR 4.6 engine under "Vehicle tune" then write settings.
     
  7. DanClarke

    DanClarke Well-Known Member

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    I toggled it from Cruise to non-cruise and back to Cruise in the BeCM and wrote the settings.
    It is 4.6 engine in the vehicle tune setting.

    Intertestingly...(or not), I went of a longish drive today and I experienced CC "partially" working I think.
    By this I mean that If I got the bus up to 50 and held the SET button, I could take my foot off the accelerator and it did not drop back below 50MPH, and it "felt" like it was trying to increase speed but could not.
    Similar story at 70MPH, it would drop back a little but not slow down much below 70 IF I kept the SET button depressed.
    With the car at 45mph holding the SET button did NOT provide any increases in speed.
    It is definitely not right.
    AND of course I have buggered the connector on the CC ECU for the Res/Dec button pin :-(
    I suspect I shall have to learn to live without Cruise.
     
  8. RangeRoller dt

    RangeRoller dt Well-Known Member

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    Have you mentioned this to Wammers?
     
  9. marjon

    marjon Well-Known Member

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    Sounds like you are getting close:)

    Don’t give up, what’s else have you got to do;) maybe shouldn’t ask that:)

    J
     
  10. DanClarke

    DanClarke Well-Known Member

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    No, I have not mentioned it to @wammers for any insightful help or comment, but, Tony, If you can spare a moment I would appreciate your thoughts/suggestions.
     
  11. Datatek

    Datatek Well-Known Member

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    So the systems know that cruise is present and it tries to hold speed, so it sounds like there might be a vacuum leak so it cannot hold or some other mechanical fault.
    Cruise is only operational above a certain minimum speed, no idea what the minimum speed is on the V8.
     
  12. DanClarke

    DanClarke Well-Known Member

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    Well, if I jumper the pump to run, then the bellows contract and stay contracted, until I power the dump-valve; so I cannot see there being a leak.
    It is a puzzle. I shall have another go at it soon.
     
  13. Henry_b

    Henry_b Well-Known Member

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    Give it a thump 'wif 'ammer! ;)
     
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  14. cornishboater

    cornishboater Active Member

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    Doesn’t the dump valve break vacuum when de-energised? The two good cruise units I have on the bench hold vacuum when connected to 12v and then break vacuum when power is removed. If you run the pump without the dump connected the bellows contract until the power is removed.
     
  15. cornishboater

    cornishboater Active Member

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    Dump connected to neutral that is
     
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