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T4 ECU & auto box weirdness |
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Aspo13 
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Joined: 01 Mar 09 Location: Chesterfield Status: Offline Points: 233 |
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 Topic: T4 ECU & auto box weirdnessPosted: 11 Nov 11 at 10:49 |
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Is it possible that if my ECU is playing up I can simply plug in another one to see if I can get rid of the glow-plug light flashing or are they all coded to an individual vehicle?
Just wondering if I can plug another one in, see if the problem disappears, then its pointing me to the fact that my ECU is having a dicky fit.
Also the auto box seems to have an issue where it will intermitantly stop changing up into 4th gear. Pulls fine but just wont make the last shift. If I stop turn off the bus and back on again its fine.
The box was replaced with a new one 2 years ago so I wouldn't have thought that the oil level would be low but I'll be checking it anyway. Can someone confirm what type of fluid I need for a 2001 model bus, quantity and the best place to get it from.
Thanks
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max and caddy
Vanorak 
Joined: 12 Dec 09 Status: Online Points: 2580 |
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Posted: 11 Nov 11 at 19:39 |
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Its coded...what fault codes are you getting? ECUs are generally very reliable and it will affect the gearbox ECU as well (yep, its got an ECU for that too)
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jets
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Joined: 31 Dec 06 Location: Australia Status: Offline Points: 136 |
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Posted: 11 Nov 11 at 22:45 |
It depends what fluid was used in the box 2 years ago. If it was a VW changeover then stick with the genuine oil. You will need to buy 4 litres. That is not what it holds[around 5.3 from memory] but you will only be able to drain around 3.75 litres. Do not mix different oils.
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Aspo13
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Posted: 12 Nov 11 at 23:34 |
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Think I'll give the company who fitted the box a ring as I have a stack of invoices from when I bought the van. Hopefully they'll be able to confirm what oil was used.
I'll get a list of the fault codes off Vagcom when it goes in for a service on wednesday.
If the ECU is knackered from the re-map what do I do? How do I establish if it is knackered in the first place. Wife even wants to swop it for a Range Rover!
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Aspo13
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Posted: 16 Nov 11 at 19:19 |
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The gearbox company that the bus previously visited were called J.T. Automatic's. Just for the record they have been really helpful to me over the phone and even offered to diagnose any faults if I could get it to them  The lady couldn't have been more helpful even though the box is (just) out of warranty. She even asked me to call her back with the fault codes and she'd try to point me in the right direction with a remedy. Even though the bus is pissing me off it cheered me up that people are still willing to help. 2 minutes on the phone and I feel much better about sorting it all out. The fluid is Dextron 3 if anyone can tell me where is cheapest to get it from. Thanks
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Aspo13
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Posted: 17 Nov 11 at 20:01 |
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Spoke too soon. Plugged it in to Vagcom and I have the following list;
16955 - brake switch (f) implausible signal 17978 - engine control module blocked by immobilizer 01314 - Instrument cluster - engine control module no communication intermitent 00777 - Auto Trans - throttle position sensor implausible signal intermitent 00660 - kickdown switch/throttle position sensor intermitent 00529 - engine speed signal missing intermitent 00545 - engine transmission electrical connection open or short to ground intermitent 01192 - torque convertor lockup clutch mechanical malfunction 01314 - engine control module no communication intermitent Really not sure where to begin.
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mrhutch
Vanorak
the ginger princess Joined: 21 Aug 07 Location: Herefordshire Status: Offline Points: 2787 |
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Posted: 17 Nov 11 at 20:34 |
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if all this happened recently after the remap then there is one place I would be looking.
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T3 1986 2.0 GTi Panel
RED OXIDE MURDER WAGON |
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Aspo13
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Posted: 17 Nov 11 at 22:48 |
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Remap done round the end of Jan this year, glow plug light has been on ever since but not the rest of the problems.
They've only been around for the last few weeks, unless it could have happened previously and its only just manifesting itself now?
Who knows?
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mrhutch
Vanorak
the ginger princess Joined: 21 Aug 07 Location: Herefordshire Status: Offline Points: 2787 |
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Posted: 17 Nov 11 at 23:10 |
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OK back to basics.. have you cleared all the codes and tried again? Do they ALL come back? straight away?
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T3 1986 2.0 GTi Panel
RED OXIDE MURDER WAGON |
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Or_GazM
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Joined: 16 Oct 09 Location: Norway Status: Offline Points: 698 |
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Posted: 18 Nov 11 at 10:22 |
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Not 100% certain, but I think a 2001 box should be using Dextron II oil...NOT 3.
Found this and shamelesly copied the link:
Think "ours" is the 01P, but pics of the actual box look the same. Edited by Or_GazM - 18 Nov 11 at 13:26 |
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Aspo13
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Posted: 18 Nov 11 at 15:23 |
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Thanks Hutch, yes clear the codes and they're all back within about 10 miles of driving. (Same ones)
Dr - Got it wrong van was first registered early 2000 so its probably a 2000 model. They definately said dextron 3 and they built up and installed the new box.
Thanks everyone (so far)
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Or_GazM
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Posted: 18 Nov 11 at 20:23 |
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The "new" box came in late 1997...the one with the 4th lockup on the torque converter...and definately NOT using Dextron III.
You need the VW spec oil for it.
If you had a box replaced with Dextron III in it, and the torque con was not drained (which is not possible as far as I know), you'll have something like 4 litres of one fluid and 3.5 of the proper stuff....not a good mix.
Been told the seals are also different, and can "crumble" with the wrong oil, filling the box with crud, and messing the valves up.
Proper fluid is an arm and a leg...VW dealers charge around 150 quid to do a change, and if you have a mix of different oils in there, you'll need at least 3 changes within a couple of thousand miles before you get anywhere near the "pure" fluid that should be in there.
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Aspo13
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Posted: 19 Nov 11 at 21:48 |
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No need to drain the torque convertor, it had a brand new one when the box was fitted.
Question now is where do I get a second hand ECU to plug in and try for a few days. If the codes go then I guess I'll know that my own ECU is knackered, if they still remain then I have to sort out potential gearbox issues and start checking through the wiring loom bit by bit.
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Or_GazM
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Posted: 24 Nov 11 at 19:44 |
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I suggest you read this thread "stolen" form t'other side
http://www.vwt4forum.co.uk/showthread.php?t=100941
Seriously, I don't think Dextron III is the correct fluid for these boxes....
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Or_GazM
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Posted: 25 Nov 11 at 14:42 |
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Just found this quote....
"I rigged up the VAG-COM and went out for a drive to monitor the Auto-Box temp. I was a tad shocked when I discovered that it took no time at all to get the fluid up to 120C (250F) and went as high as 140C (280F)!!! "
The standard cooler uses the same water as the engine, and so is also a heater....
But at those running temps, check the specs and you'll see why Dextron III is pretty useless.
Jim Doodle has a great "running" thread about these boxes....
Sorry to bring another site into play, but it's very helpful and informative! Edited by Or_GazM - 25 Nov 11 at 14:44 |
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Aspo13
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Posted: 15 Dec 11 at 23:24 |
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Sent the ECU back to the guy that re-mapped it in the first place. He assures me there are no problems with any of the parameters that they've changed and has suggested winding it down a bit with a 'softer' map as maybe the increase in fuel pressure from the original map was causing problems.
As for all the gearbox stuff, who the hell knows we'll just have to plug the revised ECU in and hope for the best. One thing he did point out was the ECU had manual gearbox settings in it not the auto Just waiting for it to arrive and then I'll try it for a day or so and plug it back in to VAGCOM.
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Aspo13
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Posted: 12 Jan 12 at 23:22 |
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Got ecu back after being told there was nothing wrong with it in the.first place and hey presto, all the.faults have.gone, with all gears selecting as they should. Feels a bit smoother too.only problem now is the.immobiliser intermittently keeps.killing the engine whilst driving,which means I lose the brakes and steering.
After removing a right rats nest of wires getting rid of the eBay alarm and going back to the factory fob I think I might need someone who has the ability to recode the fob and any other assorted gubbins. Any suggestions near to chesterfield? |
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Aspo13
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Posted: 02 Feb 12 at 22:28 |
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After a bit of messing around ( a big thanks to Brirckwerks for pointing me in the right direction with the auto electrician) I have ended up with the bus at Gilders in Sheffield.
They have diagnosed the intermittent cutting out as a '109 power supply' relay??? Can anyone elaborate on what this is or does and whether it would affect the immobiliser in any way. Hopefully this should sort it and I can get back to enjoying driving.
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light
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Posted: 02 Feb 12 at 23:49 |
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Its the main power supply relay for the ignition ecu and glow plugs ,it is a common fault with all vw tdi of certain years the solder on one off the terminals break`s down
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Aspo13
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Posted: 03 Feb 12 at 09:04 |
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Fingers crossed
 this sorts it.
Thanks for that.
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Aspo13 wrote: