4WD Service Required???
Newbie
Joined: Jun 2009
Posts: 11
Likes: 0
From: canada
I always wonder if this causes the failure in my ACD pump.
" Various problems plague the ACD / AYC pump (Hydraulic Unit) but most have to do with something called "Galvanic Corrosion". This occurs when two dissimilar metals with a fluid layer in between them form corrosion. There is no real solution to this problem in terms of preventative maintenance except changing the fluid in the Transfer Case and Rear Differential (gear oil and ATF) more often. DO NOT service/change/drain the fluid in the AYC / ACD pump in terms of preventative maintenance. Keep it at the correct level and make sure it's not brown and smelly (indicates BIG failure) and your good. "
" Various problems plague the ACD / AYC pump (Hydraulic Unit) but most have to do with something called "Galvanic Corrosion". This occurs when two dissimilar metals with a fluid layer in between them form corrosion. There is no real solution to this problem in terms of preventative maintenance except changing the fluid in the Transfer Case and Rear Differential (gear oil and ATF) more often. DO NOT service/change/drain the fluid in the AYC / ACD pump in terms of preventative maintenance. Keep it at the correct level and make sure it's not brown and smelly (indicates BIG failure) and your good. "
Newbie
Joined: Apr 2011
Posts: 82
Likes: 0
From: Akron, OH
Mine is definitely the ACD pump. I think I am going to send it to ACD-tuning to be rebuilt. (Anyone sent them thier pump befor?) But that is going to be a big hassle. So I am thinking of waiting until after winter. However, that would leave my system crippled when it is most needed.
Anyone know how crippled it will leave me in terms of snow driving?
Also, I am able to switch the ACD functions (tarmac, grave, snow) for the first couple minutes. Is that going to really do anything if the pump is bad?
Anyone know how crippled it will leave me in terms of snow driving?
Also, I am able to switch the ACD functions (tarmac, grave, snow) for the first couple minutes. Is that going to really do anything if the pump is bad?
Newbie
Joined: Feb 2010
Posts: 26
Likes: 0
From: GTA, Ontario, Canada
I am selling rebuild kits for the Ralliart and EVO X pumps. The kits are running $200. We can also rebuild pumps for guys in Canada. We’re in the GTA, so you can even pick up your kit or drop off your pump for service, if you’re close enough. If anyone is interested, I can provide more details. Here is a link for the Evo kit, but as I mentioned, we have Ralliart kits too. Cheers!
http://www.ebay.ca/itm/Mitsubishi-EV...77804b&vxp=mtr
http://www.ebay.ca/itm/Mitsubishi-EV...77804b&vxp=mtr
Newbie
Joined: May 2013
Posts: 1
Likes: 0
From: lowell
Anyone else experience the SERVICE REQUIRED message when the ambient temp outside was really hot?
Today it was about 40C (or 104F) and my car was parked outside at work all day. When I fired up the car at 5pm (still hot outside!), the SERVICE REQUIRED message immediately went on. After driving it for 40mins on the highway (gentle speeds) I parked the car about 20mins (let it idle for a few minutes to cool the turbo) in the shade. When I fired up the car again, the light went on after a few blocks. I parked it at home for the next 5 hours and the ambient temp dropped to 23C (73F). Fired up the car and drove it for 15mins with no SERVICE REQUIRED message coming on! This is only the second time the message has come on. First time was last week when the ambient temperature was just as hot, if not a few degrees hotter.
My RA is a '09 with relatively low mileage, about 67000km, driven gently. No change in vehicle behaviour when the service message is on.
Anyone know if the AWD ECU reflash includes hot temp issues also or is experiencing similar issus when its really hot?
Thanks.
Today it was about 40C (or 104F) and my car was parked outside at work all day. When I fired up the car at 5pm (still hot outside!), the SERVICE REQUIRED message immediately went on. After driving it for 40mins on the highway (gentle speeds) I parked the car about 20mins (let it idle for a few minutes to cool the turbo) in the shade. When I fired up the car again, the light went on after a few blocks. I parked it at home for the next 5 hours and the ambient temp dropped to 23C (73F). Fired up the car and drove it for 15mins with no SERVICE REQUIRED message coming on! This is only the second time the message has come on. First time was last week when the ambient temperature was just as hot, if not a few degrees hotter.
My RA is a '09 with relatively low mileage, about 67000km, driven gently. No change in vehicle behaviour when the service message is on.
Anyone know if the AWD ECU reflash includes hot temp issues also or is experiencing similar issus when its really hot?
Thanks.
This 4WD SERVICE REQUIRED LIGHT never came back on for me..
I went to the dealer awhile back and they told me they found nothing wrong with it... and i had to pay $150 for doing jack ****!!
But yea since then.. it never came back on... so i dont know whats wrong or if the ACD pump is out/ already out....
My car drives perfectly fine... i dont feel anything different...
As far as Mitsubishi warranty... its totally BS!!!!
I went to the dealer awhile back and they told me they found nothing wrong with it... and i had to pay $150 for doing jack ****!!
But yea since then.. it never came back on... so i dont know whats wrong or if the ACD pump is out/ already out....
My car drives perfectly fine... i dont feel anything different...
As far as Mitsubishi warranty... its totally BS!!!!
Newbie
Joined: Feb 2015
Posts: 2
Likes: 0
From: Compton, CA
If the light goes off when you re-start the car, it's a fluid viscosity warning. If the light stays on after re-starting the car its a pump issue. (Per Owner's Manual, just not verbatim).
I personally have had this light go off 3 times. Each time my heart jumped into my throat (totally understand), pulled over, re-started the car, everything was fine). The one other thing I've heard that can set this off is if you have worn out tires on the front/back and place new tires on the other half of the car. The larger diameter of brand new tires can make the AWD system ask "WTF?"
I personally have had this light go off 3 times. Each time my heart jumped into my throat (totally understand), pulled over, re-started the car, everything was fine). The one other thing I've heard that can set this off is if you have worn out tires on the front/back and place new tires on the other half of the car. The larger diameter of brand new tires can make the AWD system ask "WTF?"
Evolved Member
Joined: Sep 2009
Posts: 1,274
Likes: 3
From: Baltimore, MD
Newbie
Joined: Jun 2014
Posts: 19
Likes: 0
From: Wisconsin
Hopefully not the AYC pump but it sounds like it. Mitsubishi did just FINALLY send out a manufacturer recall / warranty extension on them and I got mine replaced for free. Using it as my DD so I want to relocate it to the trunk before winter comes again.
Newbie
Joined: Jun 2017
Posts: 1
Likes: 0
From: CT
All wheel drive service required light
All wheel drive service required light keeps going on and off. Only goes on when I'm driving 50-60 mph on the highway. Brought it to the dealership they replace the pump and ECU but that didn't fix the problem the light still comes on. What can the problem be!!!
Newbie
Joined: Jan 2013
Posts: 4
Likes: 0
From: Villa Hills, Ky
Battery
I have a 2010 GSR and for about a year, my local mechanic kept saying that I needed a new battery 'cos he was getting a low volt read, but the dealership said the batter was fine. About a month ago, the "4wd system service required" light started coming on when I started car; it would go away in about a minute. The solution was the battery; got a new one and haven't seen the light come on since the replacement (over two weeks ago). I also know that if the light stays on, then you need to ensure that all 4 tires are of the same age. I experienced that as well, a couple of years ago, when I got two new front tires the light came on and stayed on. The dealership contacted Mitsubishi and I replaced the back tires as well and that resolved the problem.
Last edited by DrivingIsFun; Oct 16, 2017 at 06:55 AM. Reason: Typo
A nuance here... Not tires of the same age, but diameter.
I accept that new rear tires fixed the light in your case, however, worn rear tires "should not" have triggered the light.
The system will sense if the spare tire is mounted (smaller diameter tire/rotates faster) - it will suddenly have different rotational speed than the other wheels & trigger a light.
If the rears are more worn than fronts (same wheel/tire combo) it should not trigger a light. The difference in rotational speed signals between a new tire and a worn one is miniscule (and ignored/filtered out).
I accept that new rear tires fixed the light in your case, however, worn rear tires "should not" have triggered the light.
The system will sense if the spare tire is mounted (smaller diameter tire/rotates faster) - it will suddenly have different rotational speed than the other wheels & trigger a light.
If the rears are more worn than fronts (same wheel/tire combo) it should not trigger a light. The difference in rotational speed signals between a new tire and a worn one is miniscule (and ignored/filtered out).
