M42 bosch motronic 88 pin diagram

[NoTurbo]

Hi guys

Does anyone have a verified and accurate diagram of the motronic pin outs in an m42 175 ecu?

[Brianmoooore]

http://www.autolib.diakom.ru/CAR/BMW/19 ... /fig02.pdf
Correct AFAIK.

[NoTurbo]

Thanks Brian you are appreciated

[NoTurbo]

It is unclear from your provided wiring diagram if the Coil pack, spark trigger wires are connected to each other.

I think its the middle one in the coil connector.

Do you know if these are connected anywhere in the loom?

[Brianmoooore]

Don't understand your question. Coil triggers are quite clearly separately connected to ECU pins 24, 25, 51 and 52.

[NoTurbo]

yes, but are they connected together after the ECU at any point in the loom?

I am wondering if they fire independently or is the sequential firing the result of a combined signal?

If I were to connect a multimeter across any two the trigger wires at the coil plug end would I be able to measure continuity between coil plugs?

[Brianmoooore]

Can all be fired independently.
With the ECU and coil packs unplugged, there should be no continuity between any of the trigger wires.

[NoTurbo]

Thanks for the help, i have continuity across pins 2 and 3 but not pin 1.

Does that mean that pin 1 is the trigger?

[NoTurbo]

Bump

[Brianmoooore]

?? Wiring diagram clearly shows that pin 1 of the coils is the trigger. 2 is earth for the secondary, and 3 is 12 volts+ for the primary.

[NoTurbo]

Thanks Brian, sorry for the confusion on this one.