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Thread: F4 - "Limp home" mode problem , but with some curiosities.

  1. #1
    Join Date
    Apr 2017
    Location
    Adelaide
    Posts
    5

    F4 - "Limp home" mode problem , but with some curiosities.

    Eagerly, I whipped off the solenoid valve body and checked and cleaned it. (knew nothing about error codes) Reassembled the front of the car and conducted three oil changes on the gear box until I had clear fluid. All the impedance reading for the solenoids were to spec. This enabled me to driver the vehicle to the Service Centre and get the following error codes: P0740, P1844, P0732, P0733 (see, I'm learning)
    Now these codes imply a gearbox that has gone poopoo, ..... but here's the thing:

    If I stop and start the car each time I get the F4 error code (ie. the box has not changed up until it clunks into limp home mode) and I repeat this 4 or 5 times (ignition off then on), the gearbox works beautifully for the rest of the day .... and with no slipping.

    Aside from the fact that I will now replace the gearbox, my theory is that the speed sensors are malfunctioning while cold and then behave as they get warmer.
    I bought this little girl for $300 and have thrown another $300 at it (includes a thermostat) so am still eager to give it some life. Hope someone finds these observations interesting
    Ed

  2. #2
    Join Date
    Oct 2010
    Location
    Garvoc, South West Victoria
    Posts
    564
    Have you tried operating the gearbox manually using 'Command Shift' ?
    REMLR Registrant No. 436

    1979 Series III GS FFR ARN: 30-923
    1980 Land Rover SIII GS FFR ARN: 33-774
    1995 Defender 130 300Tdi - Burnt in St Patrick's day bushfire 17/3/18
    1999 Discovery II V8
    1999 Freelander 1 L Series
    2000 Freelander 1 1.8 Burnt in St Patrick's day bushfire 17/3/18
    2001 Freelander 1 Td4

  3. #3
    Join Date
    Apr 2017
    Location
    Adelaide
    Posts
    5

    Re: command shift

    Yes, have tried every combo known to man. The box continues to end up in F4 mode until four to five On / Off ignition cycles. Only then does the box return to normal opperation.

  4. #4
    Join Date
    Oct 2010
    Location
    Garvoc, South West Victoria
    Posts
    564
    That's extremely frustrating! What about trying to skip a few gears? Seems like there's a bit of a glitch happening.

    How old is the battery and/or does it go flat quickly? I've found the electrics in some Volvo cars go silly if the battery is on the way out.

    The other thing is you could leave the battery disconnected for a while to see if it resets the computer. But make sure you have the radio code before you disconnect!
    REMLR Registrant No. 436

    1979 Series III GS FFR ARN: 30-923
    1980 Land Rover SIII GS FFR ARN: 33-774
    1995 Defender 130 300Tdi - Burnt in St Patrick's day bushfire 17/3/18
    1999 Discovery II V8
    1999 Freelander 1 L Series
    2000 Freelander 1 1.8 Burnt in St Patrick's day bushfire 17/3/18
    2001 Freelander 1 Td4

  5. #5
    Join Date
    Oct 2010
    Location
    Garvoc, South West Victoria
    Posts
    564
    This link may be of help: jatco drive in 1 and 4 only | LandyZone - Land Rover Forum

    Sorry I don't have much experience with the JATCO autos as I prefer manual gearboxes. However, I may end up getting one for parts as they're very cheap. It'd be interesting to see what was involved with the manual gearbox conversion Land Rover did for the M-Sport V6 rally cars.
    REMLR Registrant No. 436

    1979 Series III GS FFR ARN: 30-923
    1980 Land Rover SIII GS FFR ARN: 33-774
    1995 Defender 130 300Tdi - Burnt in St Patrick's day bushfire 17/3/18
    1999 Discovery II V8
    1999 Freelander 1 L Series
    2000 Freelander 1 1.8 Burnt in St Patrick's day bushfire 17/3/18
    2001 Freelander 1 Td4

  6. #6
    Join Date
    Apr 2017
    Location
    Adelaide
    Posts
    5

    Re: Battery suspect

    Thanks for the hints, but battery new and I also have tried every sequence of manual shifting.

    So here is my latest suspicion.

    As I have said, Stopping and starting the vehicle 4 or 5 times over a 10 minute period restores the gearbox function to normal ......... the clue is time.

    So instead, I simply ran the car for 10 minutes in F-4 "Limp home mode", then restarted. ....... ie the same time to warm up ....... and the box worked normally.

    I am thinking that I have a faulty speed sensor (any one of the three) that is sensative to oil temperature. .......... sadly I need to remover the whole shebang to check and replace these.

    In the mean time, I have picked up another Freelander with a supposed working box for $400, so there is going to be some swapping. When I pull down the original box and check the speed sensors, I will post my findings.

    Now all I have to do is get this new vehicle from Jindabyne to Adelaide ?????

  7. #7
    Join Date
    Oct 2010
    Location
    Garvoc, South West Victoria
    Posts
    564
    Edward, I know the pain! I've just bought a Freelander diesel with a manual gearbox and on the 2 hour drive home it's gone and done the synchro's and Has lost fourth gear. Now the box is going to have to come out!

    It does sound like a sensor issue. The other thing is there could be a corroded connection somewhere that is causing too much resistance.
    REMLR Registrant No. 436

    1979 Series III GS FFR ARN: 30-923
    1980 Land Rover SIII GS FFR ARN: 33-774
    1995 Defender 130 300Tdi - Burnt in St Patrick's day bushfire 17/3/18
    1999 Discovery II V8
    1999 Freelander 1 L Series
    2000 Freelander 1 1.8 Burnt in St Patrick's day bushfire 17/3/18
    2001 Freelander 1 Td4

  8. #8
    Join Date
    Oct 2010
    Location
    Garvoc, South West Victoria
    Posts
    564
    Quote Originally Posted by Edward View Post
    I am thinking that I have a faulty speed sensor (any one of the three) that is sensative to oil temperature. .......... sadly I need to remover the whole shebang to check and replace these.

    In the mean time, I have picked up another Freelander with a supposed working box for $400, so there is going to be some swapping. When I pull down the original box and check the speed sensors, I will post my findings.

    Now all I have to do is get this new vehicle from Jindabyne to Adelaide ?????
    Hi Edward,

    How did you go?
    REMLR Registrant No. 436

    1979 Series III GS FFR ARN: 30-923
    1980 Land Rover SIII GS FFR ARN: 33-774
    1995 Defender 130 300Tdi - Burnt in St Patrick's day bushfire 17/3/18
    1999 Discovery II V8
    1999 Freelander 1 L Series
    2000 Freelander 1 1.8 Burnt in St Patrick's day bushfire 17/3/18
    2001 Freelander 1 Td4

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