ECU connections

[Sangoma]

I am looking for connections and any other data for the Siemens/Bendix ECU on a early 1992 Espace 2.0l petrol.

For instance the Haynes manual (not much goo, but it is all I have) doesn't show the O2 sensor in the wiring diagram (there are a few pins without connections shown, but maybe it doesn't use the O2 sensor?).

Any other info would be welcome..


So much frustration, so may questions, and so little info available!!

[Anders Dinsen]

I am looking for connections and any other data for the Siemens/Bendix ECU on a early 1992 Espace 2.0l petrol.

For instance the Haynes manual (not much goo, but it is all I have) doesn't show the O2 sensor in the wiring diagram (there are a few pins without connections shown, but maybe it doesn't use the O2 sensor?).

Any other info would be welcome..


So much frustration, so may questions, and so little info available!!

Hi there, I can help you with the O2 sensor, which is connected to pin 35 and ground. You will notice that on vehicles without the O2 sensor, there is a potentiometer between that and 17 (which is a 5V regulated power supply for the manifold vacuum sensor) - this is used to manually adjust mixture.

The other pins are

1+2: Ground
4: 12V permanent
6: Power supply to ECU from relay
7: Power to main relay
8: Switch to charge circuit
9: Ground connection to ignition module
10: ECU ground
11: + rev sensor
13: Knock sensor
14: Air temperature sensor
15: Water temperature sensor
16: 5V regulated to manifold vacuum sensor
17: Ground
18: Info connection to diag-connector
19: Return from main relay
20+21: Control power to injectors
23: Control to idle valve
24: Control to idle valve
25: Idle switch
27: Ignition
28: - rev sensor
29: Starter signal
31: + knock sensor
32: Ground for temperature sensors
33: Info signal from manifold vacuum sensor
35: O2 sensor

Hope this helps

[Sangoma]

Thanks dinsen, that helps a lot.

I does now seem to tie up with the manual.

The only one I could see similar but with the oxygen sensor was the "R" type system which has a throttle pot, but mine doesn't.

I have half an idea mine had the oxygen sensor added, that is if the mixture pot was inside the first cover of the ECU, because if I remember correctly, there was something like that and a relay not connected to anything, then there was two more relays in the inner box with the ECU.

You've made a lot of things fall into place, thanks.