I have an issue with throttle body number 2 on the S6 V10. As you look at the engine from the front of the car which one of the ECU’s powers this? Is it the ECU on the left or right, they are next to each other.
This is on a right hand drive UK spec car. As I look at the engine from the front the ECU’s are both positioned to the right side under the windscreen. I suspect that the 5v signal from one of the ECU’s has an issue, I just need to know which one it is that powers throttle body number 2 which is what it states it is I have issues with on VCDS. I believe that is the throttle body on the right side of the engine as you look at it from the front.
More background: Wiring to the throttle bodies has been tested and stated to be good by an auto electrician.
I have new Bosch throttle body to be installed and tested, if that does not fix the problem then this is my next route to try, even though the auto electrician says the ecu’s are fine I suspect that it could be an issue with one of the ECU’s which wont be easy to spot from a quick test and it looking about right. I just need to know which one supplies the power to throttle body 2.
More background: Car would start and drive then every few weeks an error occur. Upon turning off and re starting after a few minutes it may run file for a while and error clear itself. This got worse. So bad that I got to the point where throttle body number 2 would no longer perform the recalibration process at all which had seemed to fix it once or twice in the past. The view so far is that one of the TB’s is bad. This seems an issue many have had either with wiring, replacing TB’s and finding no solution and never getting to the bottom of it, some find wiring and a connector fixes their issue, some possibly a TB, others then usually quit and sell the car. I believe it may be an intermittent or just slight fault with one of the ECU’s powering the TB. I am trying to get to the bottom of this one way or another and will share on here as it will definitely help out others.
Hopefully my query is a simple question for some of you on here to answer for me.
I will let you know how I get on when I get to the bottom of this.