89 90 ECU diagram

[Huw Powell]

Amusingly, I have this section bookmarked in my Bentley.

Sadly, there isn't a simple pinout diagram but let's see what I can come 
up with.

Hold ECU connector by cable with left hand. 1 to 18 are the top row, 19 
- 35 are the bottom row.

23 and 26 go to the potentiometer

28 and 31 - throttle switch (idle and WOT)

4 and 5 go to the pressure regulator thing

15 goes to carbon canister solenoid

17 - ISV

16 - cold start valve

33 and 35 appear to be AC-related

14 and 34 appear to be transmission related

25, altitude sensor

This "information" is spread over roughly 30 pages of the manual, and is 
obviously incomplete.  Don't you have Mitchell's?

Hmmm, found moar...

33 - AC bk/gy
30 - ignition control unit w/bl
19 power s19 bk/r
2 br/w bridged to ground on 1988 only?
20 br/y goes to black 6 point connector rt side engine compartment
22 br/bk same harness ("t6b")
16 br to CSV
9 br/bl - t6b
10 y - on board computer
34 br ground
24 g/r 8 pin connector on right side engine harness "t8"
32 bk/y t8
3 bk/r NTC temp sensor
4, 5 DPR r/y and r/w
8 br OXS shield (ground)
7 OXS signal
28 bl/w idle switch
31 bk/v WOT switch
13 br/g ign CU
14 bk/bl power s28
15 y/r charcoal solenoid
17 g/r ISV
21 w/r ICU
1 w/gr ICU
18 br/r ground
35 br/r ground
23 gy/g potentiometer (air flow)
26 bl/y pot. and ICU
25 gy altitude sensor and ICU

Darn I just closed the Bentley before writing the page number here. 
Hope this helps somewhat.


On 6/26/2010 6:39 PM, Mark Rutherford wrote:
> Does anyone happen to have a set of wiring diagrams, or a list of the pin
> outs for the ECU they could send me.
>
>
>
> Thanks
>
> Mark Rutherford
>
>
>
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-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/