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Thread: Stuck in low range

  1. #11
    Join Date
    Jan 2011
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    Burpengary, QLD
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    I've been trying to find out where the relays are that supply the motor, not even land Rover would put 30 amps through the ecu, not having a lot of luck locating them so far, the internet has let me down.

    I fear that tracing wires might be what I'm reduced to!

    Thanks for your suggestions people, it helps just knowing it's not just me
    P38 Range Rover , the best car in the world, when it's working

  2. #12
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    Spent a bit of time with a mate and a multi meter this morning, there is no power getting to the shift motor.

    The output lines from the transfer ecu are supposed to be either zero or battery voltage but mine seems to be about 9 volts going back to earth with nothing being sent to the motor, does this suggest that the new ecu is fried, could there be something wrong with the motor that kills the ecu, is there anything I can do to check the motor, it turns when voltage is applied directly so I'm assuming it's fine.

    There is power to both the fuses 4 and 6, neither has blown
    P38 Range Rover , the best car in the world, when it's working

  3. #13
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    Had a mazda 626 do that once, put a new ecu in and car didn't even fire. Ended up sending the dizzy and ecu to petrojet and had them both refurbished. Never a problem again. So with a rangie I don't know but with a 626, yes. No help to your problem
    cheers
    blaze

  4. #14
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    So one long morning later and I'm struggling.

    Power input to the ratio ecu is a good solid battery voltage, 13.8 v with the motor running, all the earths are good and I striped and cleaned the earth points on the body anyway just to be sure.

    No matter what happens the output to the change motor stays at 7.9v out of both pairs (so both directions ), according to the testing paperwork it should be zero or battery voltage, which makes sense.

    So what are the chances that all three (yes three ) later model ecu units have all failed in the same way with no visible sign of damage, I've opened them all up to check.

    When I move the gear lever over the h gate I get all the appropriate beeping and light flashing, but no voltage reaching the plug at the transfer motor and the strange 7.9 v output from the ecu.

    If anyone has any suggestions I would be very grateful, the boss has started talking about Toyota and I'm starting to run out of arguments, why couldn't land Rover have made it properly, it would have ruled the world !

    Thanks a always for any suggestions, hints or advice on how to hold my tongue.
    P38 Range Rover , the best car in the world, when it's working

  5. #15
    Join Date
    May 2010
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    Mindarie, Western Australia
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    Mine is currently stuck in high range with the select neutral disp,layed. Just prior to the error there was a burning plastic smell and smoke in the cabin from around the passenger side footwell. I'm suspecting the 2 are related hopefully just a microswitch or similar. Whenever I try to change to low range the burning smell reappears. No serious off roading on this holiday, it's going to be high range all the way. (I'm currently in Exmouth 1250 k's from home). Once home I'll be taking apart the console to see what's melted.
    Gary

    2007 Range Rover Sport TDV8

    Modified 1996 p38a HSE sold

  6. #16
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    I found it was very easy to "hot wire " the selector motor to move between the ranges, it took a little while to find the correct position for the switches though, and that's what gives the select neutral message. Mine would Change gear at 2500 rpm no matter what with the message up , but it's not that difficult to inch it round until the correct switch combination comes around.

    I'm thinking of making an overide out of a ride height rocker switch, it has 4 lights and there are 4 sensors on the shift motor, I'm wondering how hard it would be to be able to see if the sensors are open or closed and manually set it up in the right place.

    I feel another project coming on
    P38 Range Rover , the best car in the world, when it's working

  7. #17
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    May 2010
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    I think I've found the source of the burning smell
    Attached Images Attached Images
    Gary

    2007 Range Rover Sport TDV8

    Modified 1996 p38a HSE sold

  8. #18
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    Quote Originally Posted by mtb_gary View Post
    I think I've found the source of the burning smell


    Well that looks fairly definitive, is the motor still alright, if it is a replacement ecu isn't topainful.
    P38 Range Rover , the best car in the world, when it's working

  9. #19
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    Quote Originally Posted by finallyrangie View Post
    Well that looks fairly definitive, is the motor still alright, if it is a replacement ecu isn't topainful.
    The motor had been working fine. I'll find out for sure tonight when I put the replacement ECU in
    Gary

    2007 Range Rover Sport TDV8

    Modified 1996 p38a HSE sold

  10. #20
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    Jan 2011
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    It might be worth just checking the motor with a battery across the terminals before you fit the ecu, I have read that one of the two not working can damage the other.

    Hope that's all it is
    P38 Range Rover , the best car in the world, when it's working

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