MFTS F76 wiring colours ??

[Bambi]

Hi All

Despite reading all the hits in my searches for the colour codes, all the docs, from S2 central to SJM have different colours than mine. My plug disintegrated, and I got a new one from Audi, but I don't know where to put the connectors. Mine's colours are:

Black / Yellow
Brown / Blue
Black / Blue
Black / White

Can any one help?

[UrS4boy]

Hi All Despite reading all the hits in my searches for the colour codes, all the docs, from S2 central to SJM have different colours than mine. My plug disintegrated, and I got a new one from Audi, but I don't know where to put the connectors. Mine's colours are:Black / Yellow, Brown / Blue, Black / Blue, Black / White
Can any one help?

I have posted this before. I think the colours come from the C4 Bentley. Does it not work? (I guess not)

[turbofan]

http://www.sjmautotechnik.com/trouble_shooting/cooling.html

[UrS4boy]

I have posted this before. I think the colours come from the C4 Bentley. Does it not work? (I guess not)

I checked the Bentley manual for the UrS4 (93), the UrS6 (95 model year) and the UrS6 (96 model year) and all three diagrams are the same as the above:

1/T = Brown/yellow
2/R = Blue/green
3/+ = Black/blue on the UrS4, not used on the UrS6
4/C = Blue/yellow

Not meaning to be disrespectful, but is there a chance the your wires are not for the MFTS which lives under the intake manifold?

More MFTS info here:

http://forums.quattroworld.com/s4s6/msgs/22584.phtml

[Bambi]

They are for the MFTS. I went to my URS4 to copy the wire codes and to my big surprise the colours didn't match. Now I'm stumped. Maybe I could measure them out with a multimeter if someone could help with what I should see on which wire?

[turbofan]

+ - Voltage supply, term. 15a (battery voltage)
C - Actuation of coolant temperature warning lamp (overheating) (termoswitch)
R - Air conditioner safety shutdown (termoswitch)
T - Actuation of coolant temperature gauge (9,8 ... 10.4 V from dash)

[stocious]

i also just went to fit new plug and tails to my mfts ans found the colours to be differnet than described also. uk reg 3b s2 1991 ???

[UrS4boy]

i also just went to fit new plug and tails to my mfts ans found the colours to be differnet than described also. uk reg 3b s2 1991 ???

Strongly suggest that you start a new separate thread because this one obviously didn't get enough response in the hour or so that you let it sit.

[stocious]

is that copied and pasted too. clean hands worn keyboard !!

[UrS4boy]

One Version of a 3B MFTS wiring diagram

Hi All Despite reading all the hits in my searches for the colour codes, all the docs, from S2 central to SJM have different colours than mine. My plug disintegrated, and I got a new one from Audi, but I don't know where to put the connectors. Mine's colours are: Black / Yellow, Brown / Blue, Black / Blue, Black / White. Can any one help?

This isn't going to be perfect but it will be closer.

From pg. 9/17 of this 3B Motronic schematic on S2central.net showing the F76 Electronic Thermoswitch (aka MFTS) and its four pins:

3/+ = Track 93 black/blue ==> goes to Track 70 on pg. 7/17 which is the switched power from fuse S12

2/R = Track 95 starts as blue/black but then becomes blue/white ==> goes to Track 22 on pg. 3/17 which is Pin 36 (T55/36) of the ECU = then likely to the A/C control ECU

4/C = Track 98 blue/yellow ==> goes to T26/10 of the J189 Autocheck module (also on pg. 9/17)

1/T = Track 99 brown/blue ==> goes to Track 78 = T26/2 of the instrument cluster = G3 coolant tmep gauge on pg. 8/17

http://www.s2central.net/S2_Schematics/A/A17.PDF

[UrS4boy]

One Version of an ABY MFTS wiring diagram

Paul N. also has an ABY wiring pdf so I had a look at it after decifering the 3B MFTS. Here is the ABY info:

From pg. 8/10 of this ABY Motronic schematic on S2central.net showing the F76 Electronic Thermoswitch (aka MFTS) and its four pins:

3/+ = Track 83 black/blue ==> goes to Track 76 (stays on on pg. 8/10) which is the switched power from fuse S12

2/R = Track 85 blue/white ==> goes to Track 69 on pg. 7/10 which is Pin 46 (T55/46) of the ECU = then likely to the A/C control ECU

4/C = Track 85 blue/yellow ==> goes to T26/10 of the J268 mini-check module (also on pg. 8/10)

1/T = Track 84 blue/brown ==> goes to Track 79 (still on pg. 8/10) = T26/2 of the instrument cluster = G3 coolant temp gauge (still on pg. 8/10)

http://www.s2central.net/S2_Schematics/B/B73.PDF

[UrS4boy]

Consolidated MFTS wiring colours

Hope this works

[stocious]

where do you find this stuff ? its golden..

[UrS4boy]

where do you find this stuff ? its golden..

Find? Find?

I *create*!

(The main source of the 3B and ABY info was the Motronic info at S2central.net. The AAN info comes from reading my hardcopy Bentley C4 manuals)

Copied and pasted last nights work into an Excel spreadsheet and Bob's yer uncle (in your case, Roberto Benini is your uncle).

[stocious]

so it will be you getting pm'd when i decide to go coil on plug haha!! lucky you!!