Cruise control retrofit

fbi said:
Hi all,
My A2 has factory fitted cruise control.
But since my ECU remap by Pro Boost (FSI, to cancel the lean burn modes), my cruise control doesn't work any longer :(
I read that it's was just a matter or re-coding, what I tried, but it doesn't work any more.
I coded "11463" using "Login" in the controller (ECU).
I see that a "G" is indeed present in the information field of the controller, as it's meant to (although I didn't look if if was already there before coding)
However, in the measuring blocks, I cannot see anything GRA (=cruise) related.
MB 006 is supposed to display GRA status (0 or 1) but I got something different, the blocks a related to engine speed, lambda values, ...
So it goes for MB 022 : nothing GRA related too :( as it's supposed to.
I have seen in some blocks that the speed is OK (i.e. it doesn't rest at 0 km/h)
I suppose my brake pedal switch is OK, since the 2 stoplight bulbs (+ the central LED's) do light on when I'm braking.
Have you got some ideas, guys ? What could be wrong ?
Remove the GRA coding and reapply it ? (I doubt )
BTW, I have no engine fault code.
Thanks in advance :)
Fabrice
Click to expand...
I'd ask ProBoost, see if they can help.
Mac.
 
Indeed Steve ! Very good memory ;)
I removed my ECU, send it to Pro Boost and got it back remapped.
That makes me think the the coding for GRA was maybe even not lost and that the problem sits elsewhere ?
Strange the Measuring block 006 and 022 don't show what they should with a GRA-enabled ECU though...
 
Perhaps the issue is with a bent or damaged pin in one of the ECU plugs rather than a pro boost ECU fault. It is after all accepting the coding to enable cruise. The cruise wiring ends up in the ECU.

Also as your car was factory fitted with cruise have you checked fuse 31 with a meter?
 
No I haven't much investigated so far...
When is a voltage supposed to be checked at fuse 31 ?
 
I would say fuse 31 is ignition live to enable the cruise to turn on ( although it can not be activated below about 25mph ). Fuse 31 is the power for the cruise control ( at least the switching function of it ). Was it your own ECU that came back from Pro Boost?
If cruise was fully working before your Pro Boost ECU then extremely unlikely they would have caused the issue hence check the power from the fuse and also where you plugged the looms into the ECU.
Any other work been performed?
 
I know Tom has done this by this post..

Calling all Pro Boost FSI owners

It's now almost 2.5 years since the first UK members fitted their Pro Boost ECU's. How are you all getting on? I haven't had any complaints, so as they say no news is good news, but it would be great to hear feedback on the reliability of your FSI's over that period? EML issues, misfires...
www.a2oc.net

Andy
 
audifan said:
I would say fuse 31 is ignition live to enable the cruise to turn on ( although it can not be activated below about 25mph ). Fuse 31 is the power for the cruise control ( at least the switching function of it ). Was it your own ECU that came back from Pro Boost?
If cruise was fully working before your Pro Boost ECU then extremely unlikely they would have caused the issue hence check the power from the fuse and also where you plugged the looms into the ECU.
Any other work been performed?
Click to expand...

Thanks ;) I'll check that fuse.
Yes it was my own ECU that I sent to Pro Boost to have it remapped.
And it was the same that came back since the immobilizer worked as before.
No other work performed other than that.
Well, apart from a leak in the aircon fixed, and the driver window mechanism changed, but I see no relation with cruise.
And a new battery has been fitted too.
 
Some news on that front : fuse checked OK, and a last trial by chance showed the cruise is working :)
It was probably asleep for a too long time and needed some perseverance waking it up :)
 
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