Motronic Probing

[R6T5]

When testing pins in the Motronic connector, how do you decipher the numbering system used by BMW? After unplugging the harness from the unit, I'm simply staring at a top & bottom row of female receptacles that mate to the Motronic's "pins" but have no clue which number I'm testing. 

 

Out of desperation, I disassembled the plug and tested wire colors according to a schematic I have, but isn't there  a less invasive way? Online searched turned up nothing. 

[dirtrider]

41 minutes ago, R6T5 said:

When testing pins in the Motronic connector, how do you decipher the numbering system used by BMW? After unplugging the harness from the unit, I'm simply staring at a top & bottom row of female receptacles that mate to the Motronic's "pins" but have no clue which number I'm testing. 

 

Out of desperation, I disassembled the plug and tested wire colors according to a schematic I have, but isn't there  a less invasive way? Online searched turned up nothing. 

 

Afternoon R6T5

 

Some  Motronic connectors have very/very small numbers & some don't.

 

In any case there are 32 Motronic pins on the Motronic Ma 2.2 if I remember correctly, (I'm not near my shop to look at the moment)  so that is 2 rows of 16 pins/ The pins are numbered in sequence so you know where pin 15 (red wire) is & you know where pin 33 (green/black wire) is so just count forward or  backwards from those.  

 

At one time (back when I did a lot of 1100 work) I had a cheat sheet on my shop wall showing connector with pin numbers & wire colors. It fell off the wall & I'm not sure if I still have it or not. If I find it I will PM you a copy.

[R6T5]

Thanks for your response. I assumed there must be some numeric sequence for counting pins. As it turns out, the Motronic was bad on my bike. I had power going in, but no voltage output to the HES or fuel pump connector. 

 

After probing the parts bike, I found that it worked fine. I swapped that unit into the bike I was troubleshooting and suddenly had voltage going out to all the connectors it needs to run. I need to put fresh fuel in before I fire it up, but thanks to you fellows on the forum, I'm confident I've got it sorted out!