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Discussion Starter · #1 ·
Hello people out there,

I currently own a 53 plate FQ 300, Evo 8, and I was wondering if anybody with some expert knowledge can help me out with the problems i'm having with the AYC.

The problem is, when the car gets up to high speed then she becomes severly unstable. I've had her at the Ralliart garage 3 times, and they have checked everything, but still find nothing wrong, but as it only happens at high speed, then they can't test her properly to see it happening. They replaced a latteral 'G' sensor, but this didn't remedy the problem.:wallbang:

I myself suspect that one of the ABS sensors as being the problem, as recently (about the same time as the car started to become unstable) the ABS seems to be working unecessarily when i'm braking lightly for junctions etc, but no ABS warning light is/has been present in the dash? No other warning lights have ever been present in the dash either.

I'm thinking about buying a front and back ABS sensor and swapping them each wheel at a time until the problem goes? Can anyone advise me how much they cost, and whether this could solve the problem, as i believe the ABS sensors has quite alot to do with the input of the AYC computer?

Any help would be much appreciated, as i'm at my wits end!

Cheers,

Ryan.
 

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I'm no expert but are the 3 warning lights lit up, i.e Tarmac, Gravel & Snow all at the same time? This indicates a fault with the AYC. If just the mode selected is lit then your AYC is not logging a fault.

Have you had the suspension geometry checked out, ie 4 wheel alignment? AYC only comes into play during hard cornering.

You are correct in that the ABS sensor feeds into the AYC in order to determine the wheel speed.
 

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Discussion Starter · #3 ·
Hello Bazzer,

Cheers for the reply,

No, only the one light on the AYC display is lit, which ever one i select (mostly tarmac). The Ralliart garage has checked out the AYC electronics a couple of times now. They say that there is nothing adrift with the AYC, or any of the sensors, e.g steering wheel sensor, and 'G' force sensors, etc, feeding into it. I had them check the wheel alignments the last time the car was at the garage, and they said that all the whels were within the tollerances. They have also checked the joints through all the linkages, and they all seem to be tight. The only thing that i think can be causing this problem now, has to be the ABS sensors, but it looks to me as if the ABS sensors are pressed in with a sleeve into the hub, which i'm thinking is going to be a horrible job to try and remove?

Cheers,

Ryan.
 

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Hi Ryan,

Does this unstable behavior happen whilst driving in a straight line or cornering or both? If it just happens in straight line then I doubt you have a fault with the AYC as this only comes into play during cornering.

If the AYC ECU is not logging a fault then I would doubt it is an ABS sensor.

Regards removing an ABS sensor, I've never tried so not sure how difficult it the job would be.

Was the alignment checked doing a rough and ready check or done on a proper jig with laser alignement?

What tyres are you using and what condition are they in?

Has the car ever been involved in an accident?

I hope you find the cause mate, keep us posted. ;)
 

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Discussion Starter · #5 ·
Hello Bazzer,

The unstable behaviour only happens when going in a straight line. I'm using Eagle F1 tyres,which are about half worn. The whel alignment was checked by Ralliart, so i can only assume/hope they would do it properly as this branch of them are normally quite good with anything they do. The car has never been in a accident, and she has nerver been kerbed or anything like that, so that's why i hope it's nothing to do with the allignment. I had a look at the pickup ring for the ABS sensors around the hub, and it seems quite substantial nobbly pieces that the ABS sensors pick up from, so i've ruled out dirt/corrosion around there from preventing the ABS sensors from picking up correctly.

Cheers,

Ryan.
 

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Ryan,

I am unable to offer any more suggestions as you've exhausted all my questions. This one is far beyond me, maybe try another dealer/specialist for an independent analysis.

Keep us posted though as I'm interested in what maybe causing this.

Regards

Bazzer
 

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Discussion Starter · #7 ·
Hi Bazzer,

I think this is exactly what i'm going to have to do, as i'm really completely baffled as well. I'll keep you posted as to what the cause was.

Cheers,

Ryan.
 

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hi just a quick one for you to look at you say your abs activates some times.check the abs reluctor rings on the drive shafts thay can crack causing an uneven gap doesnt throw a fault code up feels like abs working even under normal braking
 

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hi just a quick one for you to look at you say your abs activates some times.check the abs reluctor rings on the drive shafts thay can crack causing an uneven gap doesnt throw a fault code up feels like abs working even under normal braking
Had this happen to me, one of the ABS teeth had been knocked off a shaft but it didn't show a fault. Approaching a junction around walking speed kicked in the ABS but not always. Didn't notice any high speed handling issues though.

Personally, I think the problem isn't connected with the ABS or AYC electronics but could be chassis setup or something not right in the AYC clutch packs themselves. If something to do with the ABS / AYC is affecting the handling in a straight line, you would hear either the ABS pump operate or the rear diff strain through operation. I'd imagine that the AYC operating in a straight line would do more than make the car a little bit scary to drive at speed?

Does it feel as though the front or rear of the car is loose? Possibly a tyre, but it wouldn't show up on a balancer. I've seen a tyre with a weak casing expand at speed, effectively increasing the diameter and causing some hairy moments...

Although you've had your alignment checked, take a tape measure and check the wheelbase of each side, measuring from rim to rim with the steering wheel straight. let me know if both sides are identical. Can you find out the alignment setting used at your last setup?
 

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I am -by no means- a technical wizz, but a while ago, when changing to winter tyres, I had my geometry done, and the guy who did it plugged some datalogging/reading thingy in some socket under the dash, and checked if the work on the geometrysettings had not altered the sensor controlling the "straight ahead" position in the AYC.
From what I understood, the EVO has a sensor in the AYC that senses if your steering wheel is centered, or not. If your steering wheel is centered, and the alignment of the wheels correspond to that, the sensor should be at the "0" mark, indicating no steering input.
The technician told me, that geometry work could offset the sensor, so that it would not indicate "no steering input" in the 'straight ahead' position. That could falsly tell the AYC that you are cornering, while going straight and that could give potentially very serious problems... (as one can imagine :coolsm: )
Which is why he told me that geometry work done in an independant workshop, not having the right module to check the sensor after the work was done, could lead to accidents...

My 2p
(maybe this was something widly known, but I was kinda baffled. I am usually under the impression that a dedicated tyre and wheel alignment centre has the better equipment to do the geometrywork (laserguided aso)...something most regular mitsu dealers cannot afford? Therefore, with my scoob i used to go to a dedicated centre for my alignment settings every time....However, if that sensor thingy is true, I would be very carefull about going to a tyre and wheel centre, -whom might not know about that sensor?- with the EVO...:goingmad: :ill:)
 

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What speeds are we talking about here? My Evo goes noticeably "light" at triple digit speeds, but that's due to the aerodynamics.
 

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Discussion Starter · #12 ·
Good afternoon guys.

It's three digit speeds that it happens at. It feels like your driving with a strong crosswind, then the cars front gets un-stable, and at times she can throw herself to either side of the road, almost always at the exact same speed. The ralliart garage has checked the steeering wheel sensor, whilst he was checking the wheel alignment, and says that it is fine. The ABS however is working unecessarily, at almost every junction, when going slowly. I'm not sure what the last alignment setting was when it was last checked. I'll measure the wheelbase tomorrow and see what that comes out to be.

Cheers guys,

Ryan.
 

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Hi,I had a tooth broken off an abs ring and I had the same problem with the abs kicking in as you discribed,but it didn't seem to kick in when braking from high and very low speeds. Not being an expert I can't say if the instability problem is conected with the sensor as you think????:confused:. Check if all the teeth are still attached to the abs rings.
 

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Discussion Starter · #14 ·
Hello people out there, Just to let you know that the stability problems that i was experiencing at 3 figure speeds is now sorted. I had to replace a back drive shaft which had a broken ABS ring. The ABS sensors must have some sort of input to the AYC, because as soon as i tried the car out with the new drive shaft in, then the stability problems which had been plaguing me for some time had thankfully vanished.

Cheers.
 

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Hello people out there, Just to let you know that the stability problems that i was experiencing at 3 figure speeds is now sorted. I had to replace a back drive shaft which had a broken ABS ring. The ABS sensors must have some sort of input to the AYC, because as soon as i tried the car out with the new drive shaft in, then the stability problems which had been plaguing me for some time had thankfully vanished.

Cheers.
Good to see it's sorted, AYC does feed off the ABS sensors. I had a right to-do getting Reading Mitsi look into an AYC problem I had cos it only happened when pushing really really hard. Their response was that I shouldn't be driving that fast anyway :lol: Thanks for telling me how to use an evo Reading Mitsubishi, but no thanks for costing me £750 to fix the problem myself :(
 

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Discussion Starter · #16 ·
Good to see it's sorted, AYC does feed off the ABS sensors. I had a right to-do getting Reading Mitsi look into an AYC problem I had cos it only happened when pushing really really hard. Their response was that I shouldn't be driving that fast anyway :lol: Thanks for telling me how to use an evo Reading Mitsubishi, but no thanks for costing me £750 to fix the problem myself :(
The Mitsubishi dealership i was dealing with told me the same thing. I had the car there at least 4 times, and they couldn't find the cause of the stability problem, and they couldn't find anything wrong with the ABS. To end up with i cheched the ABS rings my-self and found that one of the back one's had cracked. So when i put her back to the garage they replaced the drive shaft, and when i got her back it was immediately apparent that the stability problem had vanshied:D:D:D.
 

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Discussion Starter · #18 ·
What annoyed me the most was, the garage had been in contact with Mitsubishi UK's technical team, and they never suggested to them to check the ABS pick up rings when trying to find the route of the stability problem, even though they had checked everything else. I was getting the impression that the Mitsubishi garage was beggining to think that i was making it up that the car had a stability problem!
 
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