The 'we WILL fix this gearbox issue!' fault-finding thread!

[Davezj]

tim you car and nevs car are very different.
from the factory the differences are
different auto box
different A/T ECU
different TCL/ASC system well one has it one does not.

nevs should be a what looks like to me a standard Auto PFL with regard to the auto box and ECU, there should plenty of like for like swaps available out of early PFL.

tim, your car is a bit of an odd one.

[ex-derv]

mine has a FL box and ecu now - nev, is yours the original box?

[elnevio]

It's fair to say that I don't have that gearbox in mine, or the ECU! Well, the ECU is in the garage, but I think that's by the by...

Erm, I am still convinced that our problem is a shared one, and I am running with this assumption.


These are the facts, as far as I can tell:

We both had factory PFL gearboxes originally, which both ran just lovely, changing as they should, etc. etc.

We have both changed gearboxes to FL ones, both with matching gearbox ECUs - and the boxes are both equipped with internal filter only, speed sensor plug and OWC stamp. In fact, I have had an additional FL box in there too, not with the matching ECU, but with an ECU that was from the right period.

All three boxes have had exactly the same symptoms (dodgy 2-3 changing under load, no hill descent control, no hanging onto gears under light load, often harsh changes at low speed from 1-2, nice fast and firm change from 4-5).

Thusly, the TCL can be discounted as a problem as you don't have it!

The engine ECU can be discounted, as my interim box was run while I had my original 7201 ECU, and I am currently using a 7203 ECU. At a guess, yours is a 7202 ECU.

The autobox ECU can be discounted, as mine and yours have been matched pairs.

The gearbox itself can obviously be discounted, as all three have acted the same, but I know that my current box was working perfectly right up to going in my car, as it came out of a running vehicle.

The (unlikely, admittedly) event that it could be the engine in some way can be discounted - as I have the engine in my car to which my current gearbox was previously attached!


As you can see, this seems to be leaving very little else to look at, perhaps:

AYC ECU

ABS ECU

I think the above two items may be combined anyway?

[Davezj]

still can't find the AYC ECU
any ideas where it is in ASA

[ex-derv]

so how many variants of ayc ecu are there?

........and 'thusly' is currently one of my favourite words!

[elnevio]

As mentioned, it might be a part of the ABS ECU, perhaps. I'm sure this has already been confirmed somewhere, but I've not found it.

Tim's is indeed an interesting car. I note that the dash is definitely PFL though - with the wide AYC bars!

But this should, IMO, make it *easier* for us to find a solution between us - due to the emerging differences!

[elnevio]

Could probably do with siphoning all of this off into a separate thread, rather than keep it on a WTB thread - might increase the audience! I'll have a look at this...

But it occurs to me that I was off to put the dinner on about two and a half hours ago...

[Davezj]

maybe it is to do with the lack of the additional speed sensor on the gear box.
what is the model number of the gear box is it the E6B or the later EZB

i think it is later EZB that has one less speed sensor.
if the car is expecting this additional speed signal maybe it is the lack of that signal which is causing the issues.

[ex-derv]

sorry, missed that bit. yes, there must be a common factor - lets just hope it turns out to be fixable

[ex-derv]

maybe it is to do with the lack of the additional speed sensor on the gear box.
what is the model number of the gear box is it the E6B or the later EZB

i think it is later EZB that has one less speed sensor.
if the car is expecting this additional speed signal maybe it is the lack of that signal which is causing the issues.

would this only affect one gear shift?

[Davezj]

what auto box did you fit

nev
tim

[elnevio]

No Dave, all five boxes have had four plugs, i.e. including the speed sensor that was deleted from the last FL boxes.

[Nick Mann]

The missing speed sensor on later boxes is the speedo signal. The shaft sensors are the same. If you fitted a box with no speedo sensor to a car that had a speedo loom I am sure that you would get no speed read out on the dash.

[Davezj]

so you fitted a W5A51-3-E6B, OWC, no extrnal filter.

[ex-derv]

the box number is on a thread on here somewhere but I don't think I've got it recorded anywhere else

[elnevio]

I'll have to have a look, but both of my FL boxes will be either the last E6B or the first EZB, or one of each!

[Davezj]

odder and odder.

what ECU did you fit nev, tim, i am assuming they are the same and are match to the car.

on a side note isn't the abs ecu built in to the side of ABS pump/modulator.

[elnevio]

Well, this is the sort of stuff that I am hoping to get all in this one place to help with a definitive fault-finding process.

I am confident that if one of the things we can change ends up being the solution, the difference would be noticeable immediately, without the need to go through any gearbox learning.

[elnevio]

Dave, did you see my post earlier? http://www.clubvr4.com/forum/showthr...l=1#post735331

That has pretty much my current findings/facts in it. I am looking to use this as the basis for ongoing fault-finding.

[ex-derv]

erm..........it had a metal case on it but I didn't record that either but I do need to get in that area so I can see if the engine ecu is the flashable type so I could have a look then