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Thread: Testing XYZ Switch

  1. #1
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    Question Testing XYZ Switch

    Is there a simple means by which an XYZ Switch assembly can be tested?
    I have just replaced one with a new switch, only to find the same flashing M & S lights.
    After fitting a new battery the problem has been resolved. Old battery when tested, although indicating fully charged was only outputting 370 CCA. With this it is possible original switch may be OK.

  2. #2
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    Quote Originally Posted by Collins View Post
    Is there a simple means by which an XYZ Switch assembly can be tested?
    I have just replaced one with a new switch, only to find the same flashing M & S lights.
    After fitting a new battery the problem has been resolved. Old battery when tested, although indicating fully charged was only outputting 370 CCA. With this it is possible original switch may be OK.
    Yep, common, you've been done, the battery is always the first suspect.
    2003 D2a Auto TD5 good Landy gone
    2015 D4 probably the most amazing yet, why get a RR?

  3. #3
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    I would expect if the XYZ switch is working properly and adjusted properly that you would see each gear displayed correctly on the dash.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  4. #4
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    Yes, new switch is fine, properly adjusted. It is the old switch, that I now believe to be OK, just wanting to be able to conform it is, if possible.

  5. #5
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    Put it back in

  6. #6
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    I'd imagine that you dont have to remove the new one to test it, just plug it into the loom and move the switch manually to see if the dash display works? I knew it was my siwtch rather than battery on mine becuase the display always flickered.

  7. #7
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    Quote Originally Posted by Marmoset View Post
    I'd imagine that you dont have to remove the new one to test it, just plug it into the loom and move the switch manually to see if the dash display works? I knew it was my siwtch rather than battery on mine becuase the display always flickered.
    It is spring loaded and may be a bit hard to turn it. I guess you could try to stick something into it to lever the switch around.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  8. #8
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    There is a fair bit of auto troubleshooting info in this doc, including what readings you should get from in each position of the the XYZ switch.

    http://www.4x4community.co.za/forum/...4&d=1313492040

    The first 27 pages are primarily related to the P38a gearbox, but the remainder covers the 4HP22EH and 4HP24 boxes and GS8.87.0 (D2) and GS8.87.1 (P38a) EAT ECU's.

    Page 8 of the second section has switch readings for each of the shifter position, including transition positions i.e. 1->2, 2->3, etc.

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