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Thread: Stuck in low range

  1. #1
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    Stuck in low range


    Hello people

    As the title says, I have a little issue with getting back into high range.

    Had a great day in the glasshouse mountains yesterday, but it ended with me driving at 40kph to my mates place in low.

    I have changed the motor and transfer controller quite recently and everything seemed fine, I have got the motor off, do I need to turn the triangular shaft clockwise or anti clockwise to select high range manually?

    Thanks as always for any help and suggestions






    P38 Range Rover , the best car in the world, when it's working

  2. #2
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    If anyone ever needs to know, putting 12v straight across the motor positive battery terminal to the yellow wire on the plug winds it into high range.

    Now I just need to get rid of the select neutral message so I can hear my indicators again.





    P38 Range Rover , the best car in the world, when it's working

  3. #3
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    Haven't heard of this one before but I wonder if it is the switches on the gear lever needing a clean?

  4. #4
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    I will give the switches a look, but I think I might have made it sound more mysterious than it is, we just stuck 12v across the transfer case motor to wind it into high range 'manually ', I am assuming the select neutral message is because the selector is outside of the parameters set by the limit switches on the motor and the ecu can't alter them for whatever reason.

    Where is the solenoid that controls the voltage to the motor, we were getting nothing at the plug under the car but lots of beeping in the car, I just assumed the beeping meant the ecu knew I'd asked to change ratio.

    I will check the switch, and fuse and solenoid if I can find them.


    Ordered another ecu, it's on the way as well



    P38 Range Rover , the best car in the world, when it's working

  5. #5
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    Quote Originally Posted by finallyrangie View Post

    I will give the switches a look, but I think I might have made it sound more mysterious than it is, we just stuck 12v across the transfer case motor to wind it into high range 'manually ', I am assuming the select neutral message is because the selector is outside of the parameters set by the limit switches on the motor and the ecu can't alter them for whatever reason.

    Where is the solenoid that controls the voltage to the motor, we were getting nothing at the plug under the car but lots of beeping in the car, I just assumed the beeping meant the ecu knew I'd asked to change ratio.

    I will check the switch, and fuse and solenoid if I can find them.


    Ordered another ecu, it's on the way as well



    Try jumpering a wire from 12 volt positive post on becm to output side of fuse 17 on becm...I had a fault recently which made the shift control module and climate control completely dead,this also in turn put the vehicle in to limp mode when in drive the car would remain in 3rd gear...after doing a bit of research I ran a jumper as described and these items powered up and I had all forward gears as well, only problem was that when vehicle was turned off these items remained energized ,so I ran a wire off the accessory fed white with pink stripe wire to the output side of fuse 17 and everything works fine !....I suspect that I have a broken harness wire somewhere as I had also cleaned all connectors and even swapped becm ,ecu and key fob out of my parts car but the same fault remained ,so I swapped it all back ,then made up the jumper wire ( complete with its own inline 10 amp fuse ) and problem has not come back ,l have traveled around 2500 km since " trouble free !"...hope this helps , cheers , Rob.

    Sent from my XT1033 using AULRO mobile app

  6. #6
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    Found a very useful picture on the interweb showing the connections to the selector motor and the combinations which mean something to the computer.

    Took about 25 minutes to inch the motor around with a battery, checking the switch positions after each move until I managed to get it to report it was in high range.

    Just put it back on the car, motor says high range and the gear lever says high range, no more error message or limp mode, very happy.

    Now I just need the replacement ecu to turn up so I can select low range again!







    P38 Range Rover , the best car in the world, when it's working

  7. #7
    3toes is offline Wizard Silver Subscriber
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    From memory into low range is achieved via pushing a rod the return from low range requires an electric motor to pull the rod. Into low range is hence easy coming back can be more difficult if this has not been regularly used as the electric motor is not up to the job.

    If you are going to use low range and the history of the P38 is not known in regards to low range use is easier to do preemptive maintenance and replace this part before going into low range, If test driving try Low range however warn the owner what may happen if they have not used low range which can then be used as a negotiation point on price.

  8. #8
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    There seems to be a triangular rod that the selector motor turns either clockwise or anti clockwise to engage either high or low ratio.

    The really annoying thing is that I have been through this once already and replaced the motor and ecu, then made a point of using it regularly to keep everything moving, then when I was actually off road it got stuck.

    Murphy law I suppose
    P38 Range Rover , the best car in the world, when it's working

  9. #9
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    Replacement ecu has arrived,

    And after fitting I can report no change, the damn thing still won't select low range, I will have a proper check at the weekend but I suspect there is no power being delivered to the motor to move it.

    Motor moves when powered directly, as I found the high range position manually I would say the switches in the selector motor are working and the ecu is a replacement, there is nothing obviously wrong inside the old one.

    Could anyone suggest the next thing to check?
    P38 Range Rover , the best car in the world, when it's working

  10. #10
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    Hopefully it doesn't mean wire tracing for you. Possibly a short or bad earth somewhere?

    Cheers
    Keithy

    2002 P38 Range Rover HSE

    Sequential LPG - Redarc Charger - TPMS - Ashcroft Locker
    Wheel Carrier - Bullbar & Spotlights - 285/75/16 BFG KM3’s
    On Board Solar - Stainless Snorkel - 2” Suspension Lift

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