Fault finding Autobox Freelander 1 (V6)

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PippyDriver

New Member
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4
Hi, new forum member here.

I have a Freelander 1 3 door V6. Is basically new to me, was bought privately and has been a complete dog. It was bought to replace my last TD4 Freelander 3 door which had done over 200,000 miles but was starting to look a bit tired.

Latest snag: Autobox (Japanese five speed JATCO unit) has failed. Only answer anybody can give is "needs a new gearbox" which seems an easy answer that you wouldn't get with most other major units. If the engine wouldn't restart when hot for example or boiled over on initially starting the various symptoms would give an indication of what the fault was and how it might be fixed as opposed to "needs a new engine."

In this case, the gearbox failed on a run after about thirty miles. Showed alternating F and 4 on the dash display and the Hill Descent warning light came on. Power transmission was gradually lost until we came to a standstill. We were able to keep going for a little while by selecting 4th but then lost all drive. After standing a short while, drive was regained but only very briefly then lost again. Had to get the thing recovered home. It did then have drive at parking speeds forward and reverse but then lost it again.

When tried again a few days later, it would once again move at parking speeds. This wasn't pursued as a full test, just manouvering briefly in 1 and R.

Previous things that had gone wrong with the vehicle that may have been related:

I bough the vehicle (privately) with 51000 miles on the clock, 2001 model so 22 years old. Started and ran ok although it seemed a bit underpowered. Might just be that I expected more than it does. Very straight, no obvious problems, just a loud exhaust which I wanted changed.

Took it straight to my garage for them to service it and change exhaust for standard unit. This they did although they decided not to do the water pump whilst changing the timing belt (against my instructions).
After service, vehicle overheated (had been OK on the sixty mile drive to collect it). I took it back to them, they said head gasket fault. I said, check the thermostat. They replaced the thermostat, I got it back. It boiled over again. I took it back. (even when boiling, bottom hose was cold and temp gauge not showing hot.) I made them change the water pump.

They said it was still overheating and that head gaskets needed changing. I gave in and they changed the head gaskets. Got vehicle back, was unable to use it much for other reasons. Took stereo out in prep for replacement.

On a local run, rear brakes flicked on briefly and HDC and Traction Control warning lights came on. Took it to another garage (Land Rover independent specialists) who diagnosed faulty brake pedal switch, they changed it, lamp problem went away.
To get the remote central locking working I had to get the immobiliser unit out and sent off, this involved removing centre dash panels and gear lever console. (May have disturbed some wiring). All reassambled, new stereo fitted etc. All worked.

Went off on journey and gearbox fault developed as described above.

Possible history related faults:
Gearbox oil cooler caused gearbox to get overheated.
Wiring damaged whilst working behind centre console.
Traction control fault interfered with gearbox Electronic Control Unit.
Gearbox was removed during service work and oil pump damaged on reassembly. ( I can't see why the gearbox would have been split from engine for a service but this was suggested by a gearbox chap)

I'm maybe just being hopeful but I have a feeling that it is low on oil but unfortunately you can't check the oil level readily. My thinking is that this is why it will allow power transmission briefly when left to cool / settle. I may be very wrong. My experience with gearboxes is more rebuilding series 1 gearboxes.

That said, I'm sure that some diagnosis beyond "it's f cked" ought to be possible.

Logical fault finding suggestions please folks.

Cheers,

PD.
 
I guess this forum doesn't have anybody who knows about auto gearboxes then.

I tried it again today. Having been standing, it would drive around from cold at car park speeds in 1 and R for a few minutes then all drive ceased and it had to be rolled downhill. After being left a while and restarted it was possible to manouever it again to park it. This makes me think it is "running out" of fluid in some way. Hard to see how solenoids would suddenly stop it engaging gears after a few minutes.

Are there any forum users with actual knowledge of auto gearboxes at all?
 
I guess this forum doesn't have anybody who knows about auto gearboxes then.

Are there any forum users with actual knowledge of auto gearboxes at all?
Yes, reasonable knowledge of the Jatco box. I couldn't actually work out what the question was, so didn't have any answers.
 
Any thoughts on the problem described above? Will run for a few minutes then loses all drive. Full history in opening post.
 
Any thoughts on the problem described above? Will run for a few minutes then loses all drive. Full history in opening post.
Common issues are split pistons, burnt clutch packs, failed solenoid valves and corroded harness connections.
All have been discussed on here in over the last decade and a half.
The search button is your friend. ;)
 
Common issues are split pistons, burnt clutch packs, failed solenoid valves and corroded harness connections.
All have been discussed on here in over the last decade and a half.
The search button is your friend. ;)
1696112498136.png

Question was "Jatco gearbox loses drive after a few minutes" so no, the search function is not my friend. It is of negligible use. I had thought there might be somebody on the forum who could consider the symptoms in this case and account for the fault but it appears not. A list of things that have been known to go wrong with gearboxes is no indication of what has gone wrong with this one.
Hard to see why a corroded harness connection would behave differently whether the vehicle had been standing or had run for a few minutes.
 
Hard to see why a corroded harness connection would behave differently whether the vehicle had been standing or had run for a few minutes.
So a dodgy connection to the temp sensor would have no effect on performance? I wonder why they bother fitting one then.
:rolleyes:
Just because the search facility doesn't have an exact answer to your issue doesn't mean you can't search for each of the common faults and try to narrow it down that way.
o_O:confused::mad:
 
so no, the search function is not my friend. It is of negligible use. I had thought there might be somebody on the forum who could consider the symptoms in this case and account for the fault but it appears not. A list of things that have been known to go wrong with gearboxes is no indication of what has gone wrong with this one.
Not the usual forum way of thanking others for help and input. Your search phrase was far too specific. See examples given by GG.
 
Not the usual forum way of thanking others for help and input. Your search phrase was far too specific. See examples given by GG.
I refuse to answer. No please, no thankyou, just demands for help, which isn't how I respond with anything more than general information.
It's a forum where volunteers my help others in need, and manners go a long way in my book.
No manners, no help.
 
You cannot diagnose modern vehicles without a good diagnostic tool. Alternative F and 4 is telling you that it has a problem but you need to know which specific problem, and to do that you need the right diagnostic tool, and it needs to be one that can interrogate the Jatco ECU.

I have my own opinions on which is the best diagnostic tool for Freelander 1 but I'm a bit biased.
 
The PScan reads my autobox and all other ecus really well.
Unfortunately the intermittent 3rd to 4th bang into gear is not giving any codes so is not an electrical fault I guess.
 
Not sure I can see the solenoid positions, other than gear select A B C. So 2/4 duty, torque convertor clutch actuator etc.. Unless I haven't found it yet !??! Would like to log those on a drive as fault is very intermittent.
 
according to another thread there are nine solenoids in a Jatco.

Live data parameters that are readable (and can be logged) in pscan include:-
Line pressure duty ratio
Lockup pressure duty ratio
2/4 brake pressure duty ratio
Brake solenoid
Reduction solenoid
Low clutch solenoid
A shift solenoid
B shift solenoid
C shift solenoid

which is nine.

I'm not a Jatco expert though so whether those nine parameters correspond 1:1 to the nine actual solenoids I can't tell you 100%
 
Duty cycle is "on/off", but just many times a second. 0% would be completely off and 100% would be completely on, if the ECU actually ever sets them to 0% or 100%, which I don't know.
 
It needs diagnostics plugged in to be sure.....my cheapo ( about £50) Autel can read the freelander auto box on my TD4.....and it pointed out the 2-4 brake duty solenoid as being faulty, I replaced it and gearbox has been fine since......yeah OK turbo blew up a couple of years later but that's not the point.

The gearbox ECU is sensing a fault so get diagnostics plugged in and see what it is.....there are many it could be.....but it is likely to be only one of them.

Of course it could just be short of oil.
 
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