AWC ECU replacement
AWC ECU replacement
Can someone tell me where the AWC ECU is located? The computer to control the all wheel drive P/N 8631A040 needs to be replaced. One of the relays is evidently sticking. I get a service required warning every morning when I start it up after about 30 seconds it comes on. The dealership did the diagnostics for me. When the fault comes up, you cant get the codes if you shut the engine off, So I had to drive right to the dealership one morning while the fault was still displayed. This computer does not store any codes, once the key is turned off. My car is a 2008 Evo X. Thanks for the help.
Either that or nobody could be bothered to do a simple search for you. It would be really sad if, for example, there was a thread containing exactly this information on this site, locatable via either Google or the search function.
You know, like this one: https://www.evolutionm.net/forums/ev...replacing.html
You know, like this one: https://www.evolutionm.net/forums/ev...replacing.html
Either that or nobody could be bothered to do a simple search for you. It would be really sad if, for example, there was a thread containing exactly this information on this site, locatable via either Google or the search function.
You know, like this one: https://www.evolutionm.net/forums/ev...replacing.html
You know, like this one: https://www.evolutionm.net/forums/ev...replacing.html
Exactly what I needed, on both counts.
Last edited by n789db; May 10, 2013 at 12:51 PM. Reason: clarification "on both counts"
Cool.
And please note that Rob said it was on the driver's side, but the shop manual (see the thread to which I linked) shows it as being on the passenger side.
ps. before you do this, how sure are you that it's the ECU's fault? I can easily imagine a solenoid sticking in the pump, itself. The pumps are crap and break all the time. I've not heard of many problems with the ECU.
And please note that Rob said it was on the driver's side, but the shop manual (see the thread to which I linked) shows it as being on the passenger side.
ps. before you do this, how sure are you that it's the ECU's fault? I can easily imagine a solenoid sticking in the pump, itself. The pumps are crap and break all the time. I've not heard of many problems with the ECU.
Cool.
And please note that Rob said it was on the driver's side, but the shop manual (see the thread to which I linked) shows it as being on the passenger side.
ps. before you do this, how sure are you that it's the ECU's fault? I can easily imagine a solenoid sticking in the pump, itself. The pumps are crap and break all the time. I've not heard of many problems with the ECU.
And please note that Rob said it was on the driver's side, but the shop manual (see the thread to which I linked) shows it as being on the passenger side.
ps. before you do this, how sure are you that it's the ECU's fault? I can easily imagine a solenoid sticking in the pump, itself. The pumps are crap and break all the time. I've not heard of many problems with the ECU.
Well the dealer had a computer on it, and thats what they claimed, the pump works fine. They even drove it around with the computer hooked up.
It is quite possible and even likely that the drawing is for RHD, as the first folks to put the Evo X FSM on the web were Brits.
As to the idea that, since a dealer drove it around hooked up to something, this shows that it was the ECU ... you have more faith in Mitsu service techs than I do. And the manual pretty much tells them to just replace stuff until the problem or the customer goes away. If it's their dime, then let do what they wish. If it were my dime, I'd be looking at the solenoids on the pump.
As to the idea that, since a dealer drove it around hooked up to something, this shows that it was the ECU ... you have more faith in Mitsu service techs than I do. And the manual pretty much tells them to just replace stuff until the problem or the customer goes away. If it's their dime, then let do what they wish. If it were my dime, I'd be looking at the solenoids on the pump.
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It is quite possible and even likely that the drawing is for RHD, as the first folks to put the Evo X FSM on the web were Brits.
As to the idea that, since a dealer drove it around hooked up to something, this shows that it was the ECU ... you have more faith in Mitsu service techs than I do. And the manual pretty much tells them to just replace stuff until the problem or the customer goes away. If it's their dime, then let do what they wish. If it were my dime, I'd be looking at the solenoids on the pump.
As to the idea that, since a dealer drove it around hooked up to something, this shows that it was the ECU ... you have more faith in Mitsu service techs than I do. And the manual pretty much tells them to just replace stuff until the problem or the customer goes away. If it's their dime, then let do what they wish. If it were my dime, I'd be looking at the solenoids on the pump.
Well here is the latest, I got a used part from a 2011 EVO wreck, same part number. Only paid $75 for it compared to $800 at the dealer and about $600 from Mitsubishiparts.net .
The fault I was getting went away, now however ever few minutes the Tarmac, gravel, snow (Whichever it is on) indication flashes on and off a few times at a constant on off rate, when this is happening you cant switch between Tarm, grav, snow. As soon as it stops (again steady on) you can change again.
Anyone know what this may mean. The original warning I was getting said that service was required and displayed the 4 wheels drive train symbol with the front tires pointed to the right. It mostly happened at initial start-up for the day after maybe 1 minute.
Why that would go away a new problem arise when you replace the ECU is beyond me.
When I got the old fault, it would usually not come back if I restarted the car.
Was that back during the winter? One of the main killers of the pump is trying to reach standard pressure with cold, thick fluid. This is why Mitsu issued a TSB to reprogram the system to delay pump start-up on cold days ... to give the fluid some time to warm up. Once the fluid is warm, even a weak pump seems able to work. If you had problems when first starting the car in the winter, but didn't have a problem when the car was warmed up (or in summer), then that, again, exactly matches the dying-pump theory.
Was that back during the winter? One of the main killers of the pump is trying to reach standard pressure with cold, thick fluid. This is why Mitsu issued a TSB to reprogram the system to delay pump start-up on cold days ... to give the fluid some time to warm up. Once the fluid is warm, even a weak pump seems able to work. If you had problems when first starting the car in the winter, but didn't have a problem when the car was warmed up (or in summer), then that, again, exactly matches the dying-pump theory.
After out in the cold during the day, never was an issue, in the winter and it can get cold in Utah.
When I put the original back in, It reverts back to the old symptom and the 2nd one again does as described before, when swapped back again. I am not convinced there is anything wrong with the 2nd one, it could be that some reset needs to be made with the main computer, to accept its new connectivity.