[Guest]

Unfortunately my car is one of those that is affected by the recall. I have supplied my car detail's to Mitsubishi/Uk and they confirmed that is one of those recall units.
I would like to know whether they are going to change any parts for me. Secondly, is it dangerous to drive at high speed with this AYC problem in mind?
Thank you.

 

[Guest]

If I were you I would disconnect the AYC by removing the fuse on the battery terminal until the new ECU arrives. The fuse is situated on the |PLS|ve battery terminal and is marked with a small pic of an axel.

This way the diff wont be triggered at the wrong time and kill your rear diff. The fuse removal is the only way to disable the AYC and the procedure is outlined in the technical manual.

Good luck

Jonathan

 

[Guest]

Thank you for your suggestion. If I leave the AYC connected to the ECU, would it destroy my rear diff. The other problem is that, the car is now in Malaysia. I have suggested to Mitsubishi/UK to send me the new ECU so that I can replace it here in Malaysia. The car was bought brand new from a grey importer called Humphreys and amp; Foulkes in Newtown, Wales in 1998. I am still waiting for their positve reply from Mitsubishi/UK. Can anyone out there give me a good solution to solve my problem?

 

[Guest]

The Fault in the AYC ECU manifests itself in the form of a rather wierd feeling that the car wants to turn from the rear. While driving in a straight line after negotiating a turn or bend you may feel that the car wants to turn some more !.....The ECU is effectively going into spasm and triggereing the AYC pump to activate the AYC clutches in a random fashion. This may kill the diff if the car is driving at speed when it happens. I know of one bloke whose diff locked up and threw oil out all over the road ! One other EVO owner has experienced the odd left/right turning feeling while driving but sofar his diff is still working. The reason for suggesting that you disable the AYC is because the erratic pump operation can wear the diff clutch plates excessively and they cannot be replaced. The only option is to buy a new one which costs in the region of £3000.

If it were my car I would disconnect the AYC until the new ECU arrives.

The recall is world wide, so you should be able to get one from a dealer in Malaysia too.

Jonathan

 

[Guest]

I have managed to removed the AYC fuselink 2 days ago. After removing the fuse, the AYC warning light in the dashboard comes on after a while when you are driving. So far I have not experienced anything that resembles what you have described while driving my car. Probably I do not use the car that often.
Problem is in Malaysia all Evo models are grey imports and there are just a handfull of these running around in the country.

 

[Guest]

Anybody out there has any idea, how much does the AYC ecu cost. I am talking about the
defective part that needs to be replaced.

 

[Guest]

I think I'm right in saying that there are none of the relevant parts available in UK currently (but I stand to be corrected) so that really, the price is academic !

Why don't you try asking Colt Car Company - they might know , but remember to ask how quickly they can get one for you too !

Here another thought for you on the subject : if you are told that you car is affected by the recall, but you have no symptoms of the problem, even after reasonable mileage ( say 20k) should you actually change the part ? - if as I understand the exact reason for the fault is not really known, is there not a danger that you may replace a good ECU with a bad one ? - remember that some E6 owners are now reporting the defect in their cars, even though its supposed to affect only 4/5's - so clearly some ECU's fitted to 6's are faulty too !

I'd stand to be corrected on any of the above if anyone actually knows the truth !

 

[Guest]

I am suprised that the AYC light comes on while driving if the fuse has been removed ?

Can anyone from a Mitsubishi dealer or from CCC enlighten us to the reason why ?

Is it because the main ECU expects feed back from the AYC under certain conditions so the light come on when there is no response due to the removed fuseable link ?

Jonathan

 

[Guest]

I have just read the workshop manual and now understand that the AYC light is
illuminated when the AYC ECU power supply drops below a certain level.....in your case 0V.
The error code will be code 12 and is generated by the main ECU when it gets no response from the AYC.
I think that this is normal under the circumstances.

Clarification from an official source to reassure us all that there will be no damage done to the diff over an extended period of inactivity would still be welcome !
I feel that those of us who have dissconnected our AYCs in an effort to save the diffs
should not run into problems here as we are having to wait for ages for the replacement ECU's

 

[Guest]

OK, now I'm worried!
I posted a query a few months back describing one instance of snap oversteer exiting a corner that I believed was AYC related. Most people believed it was caused by too much speed, or driver error. It was a very strange sensation, not the type of oversteer I would expect simply as a result of overdoing a corner. Evo4Jon's quote of rather wierd feeling that the car wants to turn from the rear pretty much sums up the feeling. I take the same corner a few times a week, and have had the same problem one time since. I've gone straight back and gone through the corner again with no problems. It's not too much speed, or road conditions! The car basically snaps out as if steering from the rear and points almost 90 degrees into the corner.
Is this a symptom of an AYC problem? Has anyone had similar incidents? Or, should I just learn to drive all over again?
Mine is an early build Evo6 GSR, no mods.

 

[Guest]

The AYC does tend to make the back end feel rather light sometimes
as it is assisting the driver to turn a bend. Have the 4 wheel alignment checked first.
I have my car set to zero degrees all round and you can feel AYC working a little too much sometimes.

Apparently, the way to tame the feeling of AYC, is to have the rear wheels set to
30 secs toe-in. This apparently makes the car feel less light at the rear and gives
a more understeer feeling which most drivers are used to. The AYC faulty ECU thang
gives unpredictable results randomly and drivers have reported that the car feels like
it still wants to turn from the rear AFTER the bend while travelling straight ahead.

The AYC in general makes the car drive more like a computer game vehicle. The forces
exerted on the front wheels while cornering, are lessened by the torque steering from the
rear. This gives the impression of considerable lightness sometimes and can feel like the car
has lost some grip when in fact it hasn't. According to MMC, the AYC ECU's at fault are only found
on the EVO4 and 5 models, so it is unlikely that your car is affected.

Have you had the AYC ECU checked on a MUTII at a Mitsi dealer ?
(they should check it for free based on the fact that if the MUT show a fault
then they get the job of sorting it out)

The diagnostic system on the MUT will look at error codes that may be resident in the ECU's memory.
Not all errors illuminate the AYC light but are still logged. Intermittent problems can be caused by
various problems such as a bad block connection in one of the harnesses. This may show up as a code 25 when
read by the MUT, but the AYC lamp does not light in this case.

Jonathan

 

[Guest]

Thanks Jonathan,
Problem occurs mid corner, so at this stage I'll put the sensation down to other forces over and above the AYC. Paranoia has subsided! http://www.ltregister.f9.co.uk/graphics/Happy.gif border|EQU| 0 align|EQU| middle > I'm having the alignment checked soon, maybe this alone will resolve the issue.
The AYC lamp has never come on. I'm in Australia (where Evo's are a bit rare), so I have not bothered to ask a Mitsi dealer if they have expertise to deal with AYC ECU error codes.
Thanks again...

 

[Guest]

I have only done about 4,300 miles on the clock from new. Like I said before, so far I have not experienced anything like what Jonathan described. It will give you food for thought when your car is affected by those recall. I will be contacting my loacl Mitsi dealer next week and see what they have to say about it. The point is we are not even sure if it is the AYC problem or what. The saying goes 'if it ain't broken, don't fix it.' In my case the car is not used and driven hard enough to know if the AYC is the culprit. Meantime have to do without AYC and god knows for how long.

 

[Guest]

Jon,
You are correct about removing the AYC fuselink next to the battery. The AYC ECU is still operational as it is fed from the fusebox but the fuse you removed is the feed to the AYC motor via the AYC relay. The AYC ECU is still active so you will get the warning light come on as you said with a low volts warning.
The was another post (which I can't find!) asking where the AYC ECU was. The AYC ECU is low down behind the centre console (behind the radio at floor level). It is NOT part of the Engine Management ECU as someone was told by a Mitsubishi dealer. Also if you are looking for the AYC ECU don't get confused with the SRS and ABS ECU's which are above and in front of the AYC ECU.

Here is the little devil that is the cause of all our worrys!!