Upgrading from Q version CCCU & ECU to AF advice needed

JIGSAW

Banned
Thanks in Advance for any advice or help with this :rolleyes:

Ile start from the begining so you know where i am,
my A2 1.4 petrol did have some intermittent faults but fingers crossed they seem fixed so far as done over 100 miles with no beeping and flashing of all the warning lights,
My Fault Codes were;

ENGINE
17598 02 lamda
17604 vgk 02 senser
16684 missfire
16685 missfire
16686 missfire
16687 missfire
16688 missfire

ABS
01314 No communication

Instruments
01314 Engine control modual No communication
01760 No communication

Imobiliser
01314 No communication
01760 No communication

symtoms were miss firing, hesitating when sitting at a constant speed , say 40, 50 or 60 even , the car would seem to lose power holding at these speeds but after a second or two it would clear and be ok ish , on cold mornings the miss firing seemed worse or possibly fuel injector problems, and every so often all the warning lights and beeping and sometimes when i reversed all the lights would go off aswell.

Armed with a can of carb cleaner and new gaskets for throtle body and egr valve and a set of spark plugs, firstly i disconected the battery , cleaned the throtle body and changed plugs and checked all hoses and wiring, i found a tiny hole where one at the back left hand side of the engine had been rubbing against a brake pipe , which i patched up with electrical tape for now till new one sourced , reconected the battery, turned ignition on waited 5 mins , ignition off , then started car and went for a test drive , seemed ok for about 5miles and then the same problem again,

next i removed the battery earth and checked earthing points in the footwells , they looked ok but removed them and cleaned up with 400wet n dry and refitted, on the n/s footwell there was also a small silver thingy and some more wiring plugs which i unclipped and checked, i then removed the n/s headlight , disconected the abs plug for accesss as earth under the pump behind the air con pipes and cleaned that main earth lead aswell,

i then removed the egr pipe and valve and noticed the vave seemed full of soot , i used an old type metal coat hanger curved hook to push in the top hole of the egr valve and push the plunger/valve down and sprayed it with loads of carb cleaner , (wear goggles) then used and old tooth brush and a little artist brush and more carb cleaner to remove all the soot , i then did the coat hanger part again untill it looked totally clean , next i disconnected the 02 plug , injectors & coil plugs , inspected and all looked good no corrosion and reassembled, i next removed the n/s floor cover and unplugged the ecu and cccu and unpluged all the other wiring plugs and checked . after reassembly i reconected the battery and turned ingnition to on waited 5mins again and then off , started my A2 and shes not had a splutter or missfie as of yet and the engine got a new note running sound to it , not so fierce sounding as before but loads more power it seems.

now to my upgrade from Q CCCU & ECU to a AF Version, ive read through many threads and posts but dont think all the informations sunk in as such as still unsure of the do's and donts,

im thinking ile need a AF CCCU & ECU & speedo cluster and keys and hoping this would just be a plug in and go affair but i would need this confirming by someone who knows, also would the AF components need to be sourced from a 1.4 petrol to match my A2 or does this only affect the ECU , with the ECU and keys would i also need the speedo cluster and lastly if its just a matter of reprograming these units to suit my car who would be able to help me with all this if i do decide to upgrade.

Ive also read of a software upgrade for the ECU's does anybody have any information about this as ive searched and found only a couple of threads with no real help or models covered by these software updates but just that its so the ECU copes with higher milage A2's

Regards Gary
 
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now to my upgrade from Q CCCU & ECU to a AF Version, ive read through many threads and posts but dont think all the informations sunk in as such as still unsure of the do's and donts,

im thinking ile need a AF CCCU & ECU & speedo cluster and keys and hoping this would just be a plug in and go affair but i would need this confirming by someone who knows, also would the AF components need to be sourced from a 1.4 petrol to match my A2 or does this only affect the ECU , with the ECU and keys would i also need the speedo cluster and lastly if its just a matter of reprograming these units to suit my car who would be able to help me with all this if i do decide to upgrade.

Regards Gary


The CCCU has no influence on the engine at all, so I am not sure why you would want to replace it? Are there any problems with the locking, windows, alarm etc.? (Sorry if I have missed an earlier post)

If you do need to swap a CCCU you do not need any other parts (except the matching key fobs) the CCCU is not involved in the ECU or the instruments to any extent.

It doesn't matter if the AF CCCU is from a petrol or diesel, the CCCUs of the same part number all the same.

You don't need to program the CCCU apart from matching the key fobs to it.


Steve B
 
Thanks steve
that clears up a few things as i thought they were all conected through each other but think another post ive read threw me on that, its more my faults ive been getting as most threads ive read , Audi dealers always point to faulty ECU in some cases lol and ive read several members recently having simular problems that are unresolved, and mine being the dreaded Q i was thinking it could be my problem before yesterday, but my main reason would be for keys as ive only one key and been told by several places ive gone and rung as mines a 2001 1.4 they cant get the sku from my car and it would work out cheaper to upgrade to AF's than paying Audi dealer for a new key and would kill 2 birds with one stones as such , have extra keys and a more reliable computer onboard.. another thing i did not mention is my A2 has opensky and unsure if this makes any difference or not too.
and no i dont have any other faults with windows , alarm, ect .

Gary
 
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The Opensky makes no difference either.

Many people also think that you need VCDS when you swap one over, you DO but only to program the remote locking, everything else is plug and play, diesel, or petrol, 4 electric windows or 2 and OSS or not.

So get your replacement CCCU, Tom (Timmus) offers an exchange service via post, get the matching key fobs. Make sure the part number on the remote part of the fob should be 8Z0 837 231 D do not get 8Z0 837 231 (without the "D").

And you will have everything you need for the swap (apart from getting the keys matched which can be done by anyone with VCDS, shame you are not close enough to me at the Heathrow Airport area, it is a 10 minute job).

Steve B
 
Thanks for all that info steve as very much appreciated ,

i have read through all yours a Timmus threads on the subject of keys and programing but my key has no numbers, worn off so could be pot luck with mine. i was under the impression it was impossible to get the SKU from my car due to its model 2001 1.4 petrol and Q type of CCCu , are you able to get my SKU or is it the case like i thought its a dealer only affair ? as if you can id be willing to meet up at some point or if your going to the ADI and could spare the time maybe there or on my way home as id be passing that way and im in no real hurry at the moment but would like a spare key that works as ive had one made which just opens the doors for now.

Gary
 
You don't need an SKU, the CCCU controls the remote operation.

Swapping that and matching key fobs does the job.

The only tricky bit would be if you needed to have new immobiliser chips coded (which you will need if you want a new additional key) but you can get your current key working on the AF CCCU by swapping the key halves over.
The front part of the key (the bit with the folding key part) has the immobiliser chip in it.

So if you swap the remote part (the bit with the battery) from the AF type of key to your old key, then the immobiliser will still operate fine.

Even if you do need an additional key, the immobiliser can be sorted on that by anyone with the right cable (not VCDS). I have one and I am sure that one or two other members have one.

But for now just source an AF CCCU and matching fobs and you will get your original key working, you can sort out a second one later.

Steve B
 
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Hello Gary,

I may have missed something, but are you only looking to move away from a Q version of the CCCU so you can have more than one key to operate your car?
If so, you do not need another CCCU.

I feel your a little mixed up as to what the various control units do, and what you might need to resolve your issues.

The CCCU controls the "Comfort" options in your car, such as the interior lighting, central locking, electric windows, .

The ECU controls the operation and management of your engine.

If you cannot retrieve the necessary information to code a new transponder to your car, which lives i the key-fob (you need a transponder coded for your car to allow the immobilser to start and run the engine), then you will need to source an ECU, instrument cluster, ignition barrel, drivers door lock and new blades that are matched to the new locks.

In short though, you should not need to replace any of the listed items.
It IS possible to retrieved the information needed to code a transponder for your car, so the information you've been given is incorrect regarding the SKU, and in fact it is NOT called an SKU, but it's an SKC (Secret Key Code).

There will be several of us at ADI who will be able to retrieve this code for you.

As a short term measure, seeing as you only have one key, it might be wise for you to go to a locksmith and have them cut you a new blade from your existing one.
That way, should you loose your only key you'll still be able to get into the car and turn the ignition on, which means lots less hassle than having no keys.

Hope this helps and see you at ADI

Cheers
Jeff
 
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Thanks for the information jeff

I have already purchased a spare key from another member and had it cut so ive a spare to get in as such, and thankyou very much on offering to help me at the ADI,

little update on my A2 , shes been running sweet as a nut and looks like its going to beat my prevous best hands down at 43miles per gallon on a 27L fill up and thats just pottering about town no long journeys, just one little hickup today while sitting in trafic i pulled forward with no throtle and the revs dropped to under 500rpm which made the EPC light come on but shes still running fine so hoping it was just me nearly stalling the engine.

Im off to see my mate tommorz to have fault codes checked and wipped so ive a fresh start nows shes running spot on.

Im still looking for information on the ECU Software Upgrades if anybody knows anything it would be appreciated but will be visiting my local Audi Dealer in the next week or so and see what they have to say on the subject .

Gary
 
Hi Gary,

I am afraid that you may find that the "ECU Software upgrade" is a bit of a myth.

I may be wrong but it is not really relevant to the A2 and as such would not make any dramatic improvements.

Happy to be proved wrong of course, I would be really pleased if it was a genuine option that can cause improvements.

Steve B
 
Hi Steve

i read somewhere if youv got a A2 with a magneti marelli ECU ( software version is ment to be shown in Vagcom )there were several software updates to help widen variables for higher milage vehicles rather than the ECU spitting its Dummy out at the slightest Hickup. but like you said info about this is very vague and not sure if a myth as found a post somewhere where they were compairing the software version numbers to see who had the latest update .

Gary

Just found this from a happy a2 owner after the update,

Well back from Audi now, with a freshly updated ECU all under "good will" so free of charge :) The version they installed is Marcelli 4MV 5246. First impressions are that the car is definitely more responsive to the press of a throttle, and pulls away a lot better from standing. It also seems more nippy up the rev range, and pulls better in 5th. So I'm definitely glad I've had the update done and would recommend,

(originally version 4637) update 1 = version 5921 latest update = version 5246

hopefully i can find out exactly what they have improved if my main dealer has any idea what im talking about that is :rolleyes:
 
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Hello Gary,

If the mate you see tomorrow has VCDS, get him to read and copy the ECU information.
The information should be something like below:

Address 01: Engine Labels: 036-906-034-APE.lbl
Part No: 036 906 034 CA
Component: MARELLI 4MV 5949
Coding: 00051
Shop #: WSC 02138
VCID: 53A58203A1E74AB983D-4B4C
WAUZZZ8Z2????????? AUZ7Z0E????????

The part highlighted in red is what you need to be interested in for the ECU software version.

I think version 5246 was the first release of the ECU software where the mapping updates where installed.
Audi should be able to flash the ECU ROM with the latest software version, but if you get stuck then I think A2 Cars in Milton Keynes should be able to assist.

Cheers
Jeff
 
thanks for that jeff
im affraid my mate does not specialise in audis hes a rover man and has an MOT scanner which i understand was a very expensive bit of kit , but connected to my A2 fine took between 30 n 45 mins to do a full scan last time he checked for me as went through everything it seems and even things my A2 aint got lol but cant complain as he does it for mates rate free in other words,

Be interesting to find someone who,s had this software update done as seems a positive thing to do especially as the mileage is going to keep getting higher and exceptable tolarances will go out the window as such .

Gary
 
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