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Thread: Won't turn over. Suspect P and N switch

  1. #1
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    Won't turn over. Suspect P and N switch

    I'm hoping very much its not the starter motor itself. when i turn the key there is a click under the dash, the under dash fan stops and not much else happens. Cannot here the starter solenoid operating.
    Same same in P,R,N,D, 3,2,1
    Any help to locate and test the isolator switch would be appreciated.
    Thanks,
    Pete

  2. #2
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    Does the gear position indicator in the odometer show the gear selected? If so that possibly eliminates the XYZ switch. Personally I’d prefer it was the starter than the XYZ.
    If the gear selection is indicated then check the small lead onto the starter is secure. They suffer from the heat and get brittle and the vibration can cause poor connection. The fact that the dash stuff shuts off probably eliminates and the ignition switch.

    just somewhere to start.
    ​JayTee

    Nullus Anxietus

    Cancer is gender blind.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  3. #3
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    Quote Originally Posted by Tins View Post
    Does the gear position indicator in the odometer show the gear selected? If so that possibly eliminates the XYZ switch. Personally I’d prefer it was the starter than the XYZ.
    If the gear selection is indicated then check the small lead onto the starter is secure. They suffer from the heat and get brittle and the vibration can cause poor connection. The fact that the dash stuff shuts off probably eliminates and the ignition switch.

    just somewhere to start.
    No.
    No gear position indicator in odometer. Am I to assume now that the problem is likely the XYZ switch? If you would prefer the starter to that then I can see I'm in for some fun. Starter had me doubting my sanity a few years back.
    Thanks for the suggestions. I'd be lost.....!

  4. #4
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    What about the selection indicator on the central console ?... if that one works and the XYZ switch is ruled out and the problem is probably with the BCU even though the BCU can be the problem for the lack of console indications too... can't you find somebody with nanocom or similar to properly diagnose this?

    BTW... if it's about the switch you should see the flashing M+S warnings
    Discovery Td5 (2000), manual, tuned

  5. #5
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    I would only prefer the starter because of the cost. XYZ is easy but eyewatering price wise.
    ​JayTee

    Nullus Anxietus

    Cancer is gender blind.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  6. #6
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    Quote Originally Posted by Tins View Post
    I would only prefer the starter because of the cost. XYZ is easy but eyewatering price wise.
    Oh, I see now!
    Crikey Moses!
    Any way of testing the XYZ?

  7. #7
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    Quote Originally Posted by Tinggu View Post
    Any way of testing the XYZ?
    Genuine OEM units can be disassembled and cleaned up for a refurb. Drill out the rivets and replace with appropriate size bolts. My XYZ switch is now 22 years old and has done 350,000km - I've had to open it up once in that time and clean up the internals.

    If it's been replaced with a pattern knock off part then it's rubbish. Internally there different and much cheaper made with reduced quality.

    There may be a guide to testing them in Rave?

  8. #8
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    Quote Originally Posted by twr7cx View Post
    Genuine OEM units can be disassembled and cleaned up for a refurb. Drill out the rivets and replace with appropriate size bolts. My XYZ switch is now 22 years old and has done 350,000km - I've had to open it up once in that time and clean up the internals.

    If it's been replaced with a pattern knock off part then it's rubbish. Internally there different and much cheaper made with reduced quality.

    There may be a guide to testing them in Rave?
    Thanks for that. Sounds promising. Much better than $1500 !!
    I did get Rave long time back but have never been able to open it.
    I have never had anything to do with the XYZ switch but it does sound as though it may be the problem. I guess i should pull it out and follow your suggestion.
    To compound my ignorance the XYZ is something I have heard of but have no idea what it does other than helps the car go.

  9. #9
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    Do you have a nanocom?

  10. #10
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    In simple terms the XYZ is a switch that tells the computer what gear is selected. It also acts as an old fashioned inhibitor switch, ensuring the car will not star with any movement gear selected, for obvious reasons. It is located on the LH side of the trans ( viewed from the rear ). It is simple to remove, although if your car has a cat then that's a PITA. Needs proper adjustment. This switch can suffer from water ingress, especially from the AC drain. The wiring to it can also chafe through a P clip on top of the trans. Def worth a look. There's a thread on here somewhere about refurbing it.

    But, both sierrafery and shack are people you listen to an topics like these. This stuff can get into the ECU/BCU/TCU part of the system, which is why the first tool recommended for a D2 is a Nanocom.

    Sorry for the pic, XYZ is located here, in front of the id plate. It has a plug in loom and a mechanical shift cable attached.

    Screenshot 2024-06-26 at 8.50.05 AM.jpg


    ​JayTee

    Nullus Anxietus

    Cancer is gender blind.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

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