I have a 2010 evo gsr I have the asc/abs/4wd service light on. Now the light comes and goes on different days. on for a day gone for a week. Come and go on the same day. Mostly when i let the car sit for a few hours, and then come back and start it...ill be making a turn and bam all the lights just go away. what do these codes mean, and why would the lights come and go? Ayc system has been bled by the way.

U0100
C1290
C1015
C101C
U3FFF
U3FFF

pleaseeeee help

 

On the bright side, those aren't the typical dead or dying pump codes. I'd say that you have lost a wheel-speed sensor, which shut down the ACD, AYC, ABS, and Type-2 ASC. On the not-so-bright side, I think you have to go to a dealership.

I'm curious as to how you bled the AYC (as well as why you did this), but that's a side issue.

edit: based on C1015 and C101C, it's your front right wheel-speed sensor; Step One is to blast that corner with a power-washer

 

I have been looking for this so called wheel sensor. what is it? where EXACTLY is it. and most importantly what does it look like? lol. I didnt bleed the ayc myself a buddy of mine did it. He had some program, and had me set the steering angle to zero, turn on the program and turn right until the ayc began to bleed/open the line he was working.stop the program, reset to zero, and then repeat the left. do this for all 4 lines. I did it because the first time the light came on i went to see fluid and it was at the low line. added more fluid while the car was on. I didnt know the fluid fluctuates while the car is on, and goes back to full when the car is off. So i thought maybe i got air in the lines.

oh and why do i need to go to the dealership?

 

Take off the right front wheel. Look at the rear side if the knuckle. The black cable heading down the rear side of the knuckle is the cable for the wheel-speed sensor. Make sure it isn't broken or cracked. Blast any dirt, etc, out from between the sensor and the hub. Trace the cable back to the chassis, looking for obvious breaks. If you find no obvious problem, you can just replace it anyway or go to a dealership. They have a tool (MUT-III) that would give better diagnostic information.

 

is this the sensor?

http://www.ebay.com/itm/like/291073214842?lpid=82
im assuming the one i would need is for the right side according to the codes correct?
gsr/mr same part?

 

Yes, yes, and yes.

 

thanks