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Disco 2 M & S lights - RAVE and Nanocom disagree!

Discussion in 'Land Rover Discovery' started by PopPops, Oct 14, 2019.

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  1. PopPops

    PopPops Member

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    Hello All,

    A bit odd. M & S lights just started flashing and limp home mode going into reverse a couple of times. Nothing unusual there for a Disco 2! Connected Nanocom, fault code P0705, position switch monitor, as I had expected. I used the Nanocom to monitor the WXYZ inputs from the switch as a reference, moving the gear lever a couple of times got rid of the fault. I thought I would compare what the Nanocom said with what's in RAVE as a sanity check for the future, and they disagree, in fact, either RAVE or Nanocom seem to have WXYZ reversed!

    This is from RAVE:
    RAVEXYZ.jpg

    And this is the equivalent from Nanocom:
    NanocomXYZ.jpg
    Open = "-" and Closed would = 12V in RAVE.
    So, is RAVE or Nanocom correct?

    And are there any tips for getting the XYZ switch off, apart from growing a few extra hands the size of my 9 year old grandaughter's!!!:p

    Thanks!
     

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  2. sierrafery

    sierrafery Well-Known Member

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    IMO RAVE is correct cos it's confirmed by the official ZF document too(see attachment page 8) though as long as you have a switch monitoring fault code current it's possible that nanocom shows those incorrect inputs which triggered the fault code
     

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    JUKE179r and PopPops like this.
  3. PopPops

    PopPops Member

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    Many thanks, what a useful document! Mine's a 2004, but I'm sure not much can have changed.

    Yes, it seems Nanocom have reversed the WXYZ. I took the readings when the fault had gone (moved the gear lever a few times) and been cleared. I'll remove the switch and dismantle it, if it ever stops raining here!

    Thanks again, what an immense source of knowledge!
     
  4. JUKE179r

    JUKE179r Well-Known Member

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  5. ronsealdeath

    ronsealdeath Sagging Member

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    When off the car its very easy to dismantle with a drill to take the rivets out. If its an brown unit, it may be unsalvageable. The newer black units are simpler.
    I cleaned up the contacts and treated with recommended magic oil stuff that sierraferry recommended. Its a pretty simple thing, just seal it all back up with silicone so its waterproof.
     
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