89 90 ECU diagram

[Huw Powell]

ICU = ignition control unit.

I'll see if I can find the missing ones.

The color codes are all straight from Bentley.

On 6/28/2010 9:46 AM, Ben Swann wrote:
>
> Great job of gathering the info Huw. I edited for clarity and put in
> order of pins.
>
> I did not verify the color or function, so be sure to double check when
> using this. If there are descrepancies, let Huw & myself know so we can
> make corrections.
>
> Huw, I take it ICU means Idle Control Unit?
>
> Ben
> _http://www.gtquattro.com_
>
> _*ECU Pinout Audi ‘89 90*_
>
> There isn't a simple pinout diagram but info can be gleaned from
> "information" spread over roughly 30 pages of the Bentley manual.
>
> Hold ECU connector cable with left hand.
> 1 to 18 are the top row & 19 - 35 are the bottom row:
>
> 1 w/gr ICU
> 2 br/w bridged to ground on 1988 only?
> 3 bk/r NTC temp sensor
> 4 r/y and 5 r/w go to the Differential pressure regulator DPR
> 7 gn OXS signal
> 8 br OXS shield (ground)
> 9 br/bl - t6b
> 10 y Instrument cluster on board computer
> 11
> 12
> 13 br/g ignition CU
> 14 bk/bl power s28 transmission related
> 15 y/r charcoal carbon canister solenoid
> 16 br cold start valve (CSV)
> 17 g/r Idle Stabilizer Valve(ISV)
> 18 br/r ground
> 19 bk/r power s19
> 20 br/y goes to black 6 point connector rt side engine compartment
> 21 w/r ICU
> 22 br/bk same harness ("t6b")
> 23 gy/g potentiometer (air flow)
> 24 g/r 8 pin connector on right side engine harness "t8"
> 25 gy altitude sensor & ICU
> 26 bl/y ICU potentiometer
> 28 bl/w idle switch in throttle switch
> 29
> 30 w/bl ignition control unit
> 31 bk/v WOT switch in throttle switch
> 32 bk/y [T8]
> 33 bk/gy AC
> 34 br ground transmission related
> 35 br/r ground AC-related
>

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/