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L322 Transfer Box Problem "noise on signal"

Discussion in 'Range Rover' started by drewsp38, Oct 7, 2015.

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  1. drewsp38

    drewsp38 Active Member

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    Hi All! Its been a while since I was last on work and now a wife seems to have taken its toll! lol

    Anyway I have a problem with my range... its a 2005 td6 and in turn LR style its giving me some S#@T!
    The problem Im having is some mornings when I go out to it, she wont move. I select drive and she just revs as if she hasn't selected gear correctly. Then when I put it back into park I hear a horrible grinding noise from the trasferbox. The little green mountain starts to flash and thats it. No matter how long you leave it it wont go in unless you roll her in Nutral down the road for about 30 meters and then she drops in gear when selected.

    First port of call was to change the oil in both the gearbox and the transferbox. No result
    So then I had it plugged in and the only fault this came up was "noise on motor signal" for the transferbox.

    Ive done a little digging and found a potentiometer fault some people have found but none of the symptoms are the same.

    Has Anyone Ever Had This Or Have Any Idea What The Cause Could Be Before I Start Trying To Locate Parts?

    Thanks

    Drew
     
  2. Bemble

    Bemble Active Member

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    Might be worth trying the manual recalibration procedure for the shift motor first.

    [​IMG]

    If that doesn’t work you need to take some resistance readings off the rotary potentiometer to confirm if it’s faulty.

    [​IMG]
    Take resistance reading between pins 1 & 2


    [​IMG]


    [​IMG]

    [​IMG]

    [​IMG]
     
  3. drewsp38

    drewsp38 Active Member

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    thanks Benble
    That's the problem. Ive just tested the unit and im only getting 1.5 when in high range. so looks like the unit needs to be replaced .

    Im collecting one from high range in the morning so will let you know how I get on.
     
  4. drewsp38

    drewsp38 Active Member

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    Hi all, so my replacement part came today. Tested from high range however unfortunately it's a no go. Still the same problem. So I'm left banging my head against the wall! All ideas welcome at this point. Next stop main stealer!
     
  5. holidaychicken

    holidaychicken Well-Known Member

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    So the new unit had the same resistance measurements as your old unit, is the new unit brand new?
    I am only curious, there is nobody in the world who knows more about this than Bemble
     
  6. Bemble

    Bemble Active Member

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    Unfortunately in all likelihood the main dealer won’t have the faintest idea how to fix the problem and will recommend a new shift motor, a new transfer box and then probably a new transmission too for good measure. Are you able to follow the recalibration procedure and see if inserting a spare 5A fuse in position 37 puts the transfer box into neutral? Also, is your battery & charging circuit in good condition i.e. do you measure 14 volts across the battery terminals at tickover?
     
  7. drewsp38

    drewsp38 Active Member

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    Hi bumble, yes I've re calibrated the shift motor, and I can here I've going through the motions when I select high and low and also when calibrating.
    The problem seems to go got worse now to. It will disengage drive while driving now,something it hasn't prevoisly done. Also when I try to shift into park after loosing drive there is a very loud grinding. I'm going to remove the new motor tomorrow and check the resistances.
     
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