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MAC-12 ECU wiring
Phil,
Interesting list. I added further descriptions from the
MAC-11B/C in parantheses.
>
Audi quattro - MB engine (MAC-12) ECU wiring
The ECU is connected to the wiring harness via a latch-
and-swing connector. With the ECU removed from the
vehicle, the wiring harness connector should be viewed
with the plastic prongs on the right and the locating
lugs along the side of the connector at the top. The
upper left pin is Pin 1, with numbering proceeding along
the connector to Pin 18 at the top right. The bottom row
is also numbered from left to right, from Pin 19 to Pin
35.
1. Blue/White Cold Start Valve (N17)
2. Brown/Yellow Chassis (gnd attached to ign coil)
3. (carbon canister shutoff solenoid)
4. (from decel shutoff valve)
5. Brown/Yellow Chassis (n/u on mac-11)
6. (auto tranny input, open for manual)
7. Mauve Idle Stabiliser (J142), Oil
Pressure Warning Controller
(to dash tachometer)
8. Blue/Black Frequency valve (N7), T35/3m (o2 freq valve)
9. Brown/Red Chassis
10. Blue Coolant Temperature (G62 - side
of block)
11. Blue Engine RPM Sensor (G28) (-)
12. Mauve Ignition Timing Sensor (G4) (-)
13. Red Ignition Timing Sensor (G4) (+)
14. Blue/White Electronic Thermoswitch (F76) (overheat switch input)
15. Brown Knock Sensor (G61)
16. White Knock Sensor (G61)
Brown (shield for above)
17. ( to digital boost pressure gauge)
18. Brown/Yellow Chassis
19. Green/Yellow Wastegate Control Valve (N75)
20. Grey Idle Switch (F60), Idle
Stabiliser (J142)
21. Brown/Red Fuel Pump Relay (J17)
22. Green/White Electronic Ignition
Power Stage (N70)
23. Brown Inlet Air Temperature Sensor (G42)
Brown/Red Hall Sensor (G40)
24. Blue Hall Sensor (G40) (intake air temp sensor)
25. Red/Black Hall Sensor (G40)
26. White Full Load Switch (F81) (full throttle switch)
27. Green Hall Sensor (G40)
28. Brown Shielding for 11, 12, 13, 29
29. Grey Engine RPM Sensor (G28) (+)
30. (o2 sensor)
31. Black/White (engine knock sensor/diagnostic light)
32. (brake light switch, used for auto tranny)
33. (o2 sensor)
34. Brown/Yellow Chassis (California code wire, open for 49 states)
35. Black/Red Power via Fuse (S34, 10A) (15 power)
>
Very similar to the MAC-11B/C ECU pinouts. One observation, it
seems that your car has only 1 knock sensor, not the 2 you
thought you had. 15/16 are used for the single knock sensor
inputs.
Notable differences
lack of o2 sensor
still has o2 freq valve control, probably uses duty cycle lookup
table in the ECU.
INteresting that the CA code wire is grounded in you app.
Which turbo is installed on the MB K26 or K24? Also what
the boost pressure?
-
Dave Lawson
83 ur-q, mac-11b, 1.8bar, k26 clipper ship