Auto gearbox problems

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Datatek

Datatek

Well-Known Member
Posts
45,015
Location
Near Poitiers SW France
Well, it's not good news on the gearbox. I have changed the oil twice, what f****ing messy job, no improvement, I'm still getting a rise in revs on 1st to 2nd and 2nd to 3rd changes.:( Going to look at the electronics next. according to RAVE ECU's need calibrating to the car if changed. I have a spare ECU so may try that after I have checked all the connections. I've had a broken wire in the AIRCON condensor fans loom so I suppose it's possible that the fault could be electrical.
The fault came on suddenly, one day it was fine next day problem, it's the same hot or cold.
Any ideas anyone? Auto boxes are not my strong suit:confused:
 
Datatek said:
Well, it's not good news on the gearbox. I have changed the oil twice, what f****ing messy job, no improvement, I'm still getting a rise in revs on 1st to 2nd and 2nd to 3rd changes.:( Going to look at the electronics next. according to RAVE ECU's need calibrating to the car if changed. I have a spare ECU so may try that after I have checked all the connections. I've had a broken wire in the AIRCON condensor fans loom so I suppose it's possible that the fault could be electrical.
The fault came on suddenly, one day it was fine next day problem, it's the same hot or cold.
Any ideas anyone? Auto boxes are not my strong suit:confused:
Click to expand...

I had a very weird problem with mine that turned out to be a bad connection between the engine ECU and the gearbox ECU - basically the gearbox couldn't tell what the engine was doing so just made random guesses and kicked down whenever it felt like it. Have you tried reading the gearbox fault codes? It gives quite a lot of information.

Just a thought.

Guy
 
Hi Guy, first thing I did was plug in the Faultmate. No faults on engine ECU or Gearbox ECU. I have just tried a spare EAT ECU, no change, so it looks like it is definately the box. Not sure what to do next. I have another box in my spares dog but it's high mileage so may not be good. Not sure either that I have the physical strength to get the box out and re-fit it.
I've toyed with removing the valve block, but on my back under the car it may end up worse.
Looks like I will have to bite the bullet and get it into a garage.
 
Datatek said:
Hi Guy, first thing I did was plug in the Faultmate. No faults on engine ECU or Gearbox ECU. I have just tried a spare EAT ECU, no change, so it looks like it is definately the box. Not sure what to do next. I have another box in my spares dog but it's high mileage so may not be good. Not sure either that I have the physical strength to get the box out and re-fit it.
I've toyed with removing the valve block, but on my back under the car it may end up worse.
Looks like I will have to bite the bullet and get it into a garage.
Click to expand...

data,have you not got any local friends that can help with getting the box in and out.:confused:
 
gemsdad said:
data,have you not got any local friends that can help with getting the box in and out.:confused:
Click to expand...

I have a few mates here but they aren't mechanically minded, I usually fix their cars for them.
If I had a pit or a lift I'd give it a go. Got to some more reading to do, but in a way it looks easier to drag the engine and gearbox out in one lump. It's a lot more work but most of it is standing up.
Going to do some more research as I have never seen this problem posted on here. Might contact Ashcroft and see what they say.
It's my worst nightmare, I can cope with most things but auto box internals are an unknown entity to me.:(
 
Datatek said:
I have a few mates here but they aren't mechanically minded, I usually fix their cars for them.
If I had a pit or a lift I'd give it a go. Got to some more reading to do, but in a way it looks easier to drag the engine and gearbox out in one lump. It's a lot more work but most of it is standing up.
Going to do some more research as I have never seen this problem posted on here. Might contact Ashcroft and see what they say.
It's my worst nightmare, I can cope with most things but auto box internals are an unknown entity to me.:(
Click to expand...

This problem has been posted before with a video of rev counter on change. Can't recall if it was ever resolved though.
 
wammers said:
This problem has been posted before with a video of rev counter on change. Can't recall if it was ever resolved though.
Click to expand...

I have been searching around but have found nothing. I'm sure mine can't be unique, but it seems an unusual problem. I really hoped that it was the ECU, but no such luck:(
 
Hi Keith,

Isn't the gearbox ECU supposed to tell the engine ECU that it is changing gear so it can drop the revs? That's what it sounds like isn't happening.

It sounds to me like it might be a comms problem.

When I had my problem, the gearbox ecu also showed a 'stuck valve' in the gearbox valve block but this seems to have been unrelated to the problem and disappeared when the faults were cleared.

Can the faultmate read the live TPS data from the gearbox ECU? It doesn't seem as though that could be the problem, but it might indicate a comms problem if there is a problem here...? Just a thought. I assume the diesels have a tps?

I had an absolute nightmare diagnosing my problem. It was also one that nobody had ever seemed to have come across before. Even Ashcroft couldn't suggest anything (although at least one person has had it since!). Be worth giving them a ring though.

Mine was due to an oil leak soaking a wiring connector to the gearbox but it took the indie 4 days to find it.

Good Luck!

Guy
 
The signal to the engine ECU is for reduced torque when the change takes place. Could be worth a punt, it does actually feel as though the boost has come in just as the change takes place at times. Have you anymore details of where the wiring was affected by the oil leak?
It might just be a coincidence, but a mouse ate a leak off pipe. When the problem with the gearbox happened I opened the bonnet when I got home and there was a considerable amount of diesel around, the front diff was covered. the 2 things happend on the same 30Km run.
What is TPS? The Faultmate can read live data but nothing directly to do with valves, mostly speed engine revs, temp etc. It cannot re-set the adaptive values for instance. The gearbox is the same on the 4.0 and the diesel, as is the ECU.
 
Last edited:
Pete The Biker said:
Datatek said:
What is TPS?quote]

Sorry to hear of your problems - hope you get them sorted soon.

TPS usually means Throttle Position Sensor, but I am not sure if this is relevant in this case - though I suppose it makes sense that the gbox ecu should take input from there.

Pete
Click to expand...

Ah thanks for that. So the throttle is fly by wire and looks OK on Faultmate live data.
Click to expand...
 
Does the Diesel auto box still have a vacuum connection to the engine like on the V8's...Many diesels are renound for vacuum pump problems and a low vacuum may cause problems if it is needed to operate the box...?
 
Datatek said:
The signal to the engine ECU is for reduced torque when the change takes place. Could be worth a punt, it does actually feel as though the boost has come in just as the change takes place at times. Have you anymore details of where the wiring was affected by the oil leak?
It might just be a coincidence, but a mouse ate a leak off pipe. When the problem with the gearbox happened I opened the bonnet when I got home and there was a considerable amount of diesel around, the front diff was covered. the 2 things happend on the same 30Km run.
What is TPS? The Faultmate can read live data but nothing directly to do with valves, mostly speed engine revs, temp etc. It cannot re-set the adaptive values for instance. The gearbox is the same on the 4.0 and the diesel, as is the ECU.
Click to expand...

Hi Keith,

The connector that got affected on mine is somewhere behind and below the passenger side rocker cover (probably not very helpful to you that!). It's near the bulkhead behind the engine...

Sorry, I meant the valves in the gearbox..

I think the indie just went through the wiring diagram in Rave and checked all connections related to the gearbox. As a side benefit, they accidentally fixed my air con too!

Guy
 
In RAVE there is a good pin out diagram for the EAT ECU, so far I have not found a pin out diagram for the engine ECU, nor have I found any reference in the engine ECU diagrams to the 2 lines from the EAT ECU that request and acknowledge the torque reduction for gear changes. Anyone know where the right drawing is in RAVE to save me a bit of time?
 
Finaly found all the connectors and pinouts. The pin numbers don't appear on the computer screen unless I enlarge the page, it just looks like connector outlines, but they come out OK when printed.
Time to go and get cold and play with the multimeter.
 
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