I did that before i took it for a spin earlier. I'll give it a couple of days to adapt.
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Looks like its going to be hot for the next couple of days! Not ideal for low intake temps/boost levels!
Still on the plus side it should make it easier to tell if the after run system now functions.Comment
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I bridged the connectors on the water manifold and it all runs fine. It's never come on on its own all the time i have owned it, of course the temp switch could be faulty. I bet of all the cars on this forum there are more with a non running after-run system.Comment
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But i u swap these connectors - won´t the ecu throw a code ? And the IAT - isn´t that one marked with a brown connector ?
I will check this on my car tomorrow
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hy
I have exactly same problem with one audi s6 (AAN) and we could't find where is problem for a one year. we try everithing.
did somebody know the difference between brown and black IAT sensor? why did they change it?
have this 2 sensors same caracteristic?
did you solve the problem?Comment
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Yes it soved the problem.
Some IAT sensors are black so that throws the colour coding idea straight the window.Comment
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I guess the key point is as I suggested in Post 7 of this thread, i.e. pay attention to the wire colours:
"1. The G42 intake air temp sensor (IAT) is a two pin. On an AAN, the wire colours are Brown/Blue from the T55/44 (ECU pin 44) and a Green/Blk wire that goes to ground (somewhere).
2. The N71 Idle speed control valve (ISV) is a two pin. It has a white/yellow wire from T55/4 (to control the ISV location) and a red power wire that comes through the S75 fuse.
3. The after-run pump. It has three wires but a 2 pin connector. A white/blk and a blk/white wire (presumably two 12V relayed power sources) are siamesed into one pin and a third wire, brown/black (presumably a ground) in the second pin.
On an AAN and I would guess on an ABY, it might be possible to swap the 2 pin connector on the ISV and the IAT. They are the same size and the wire lengths make it possible to make this minor, but important, mistake. It also looks potentially possible to swap the after-run pump into the wrong position in an AAN but I doubt that it is physically possible in an ABY situation."Last edited by UrS4boy; 13 May 2013, 21:11.RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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Yes on an ABY the IAT plug wont reach to the after-run pump, but on the AAN the wiring to both sensors are a very similar length.Comment
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I have updated my G42 Intake Air Temp sensor info post to add a note about checking the wire colours to prevent mis-connecting the IAT, ISV and/or after-run pump connectors.
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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I am not sure why there would be an issue. Even if they changed the colour of the IAT itself from brown to black, the harness connector for the IAT is brown (first photo below) and the after-run pump is black (second photo, under first)
Brown 2 pin harness connector connected to, as it happens, a brown IAT:
After-run pump connector - black in the lower middle, unlabeled, in this photo:
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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tnx guys for big explanation , but I check everithing for 5 times and 100% sure that conector of IAT is at right place.
at stock engine loom was black IAT (welded) and I change it with brown, which can be removed.
can that cause problem ? are there any difference betwen them ?Comment
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RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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Can anybody please write step by step what we need 2 do here! The problem is we can't quite understand everything u write so we are stil lost here! Im having this problem 2 years now and Im desperate, I was even thinking of selling my car cause I cant take it anymore... and its basicly a ******** error.. so is there anny difference between using black and brown sensors? I appriciate your help, many thanks... please be easy on words, keep it simple our englis aint that good
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