Love your C101!!!

[Bmwchronic]

so, i have a stupid problem.... i switched my c101 connector cap, from my other e30. it all started because i was trying to fix my tach. i have switched my instrument cluster from my other car into my turboed car with the tach problem and it still didnt work. so im suspecting its signal wire. anyways, the connector had one more prong on it, so i thought i would give it a try. Every since i put that different connector in, my car wont run. it tries to idle but it doesnt. it turns over and it fires very slowly, then shuts off. i have put my other one in and gave it a try but it still doesnt work. no fuses are blown either...

[Dennis320is]

I will try this weekend. Wich one schould be grounded? 2 or 10?

[SmokeE30]

I really hope this thread is alive.
I have just built my own harnes for my S14 engine because i have changed out the motronic unit for a stand alone management. I have only one issue and it is the oil level in check panel. I can see pin 2 and 10 is going to send some signal to the panel but my panel shows that i have low oil. I have recently drained the oil and filled upp with exact amount of castrol edge 10/60 but it wont turn of. So i think the issue is the pins. How can i make this work?

try to ground the wire, that should turn the light off at least

[Dennis320is]

I really hope this thread is alive.
I have just built my own harnes for my S14 engine because i have changed out the motronic unit for a stand alone management. I have only one issue and it is the oil level in check panel. I can see pin 2 and 10 is going to send some signal to the panel but my panel shows that i have low oil. I have recently drained the oil and filled upp with exact amount of castrol edge 10/60 but it wont turn of. So i think the issue is the pins. How can i make this work?

[BenjaminButtton]

Sticky

2nd

Awesome job sir, sticky for sure!

So sticky.

I didn't have any issues wiring mine, but this will make a lot of current swapper's lives easier.

[jjt]

Just wanted to stop by and say Many Thanks for this excellent info!

[GunMetalGrey]

Awesome job sir, sticky for sure!
Only problem is now you are going to have people complaining that it does not tailor EXACTLY to their car lol
Good job on writing all of the functions! I learned a good amount from reading this!

[thedivision]

Thanks for taking the time to do this, it's very helpful.

[nando]

Pin 14 is the VSS signal

Pin 17 is ABS feedback into the DME on the ix (engine brake torque reduction).

The only pin that is never used is 3.

Thanks for posting this. It saved me some homework in my diagrams. Now, all we want from you is similar info on modding as S62 ecu! :D

The DME is pretty easy, and the wiring is pretty similar to the s54. :)

[nando]

Pin 14 is the VSS signal

Pin 17 is ABS feedback into the DME on the ix (engine brake torque reduction).

The only pin that is never used is 3.

[JiXer]

Yeah, Im mainly concerned about the unloader relay.

[2mAn]

J, Im in the same boat as you. Im swapping a 84 to OBD 1 converted M52. I think you have it right. Pin 20 goes to the cluster and Pin 14 to the C104. Im using a OBD 1 E34 wiring harness so its not the exact same colorwise, but very similar ( my pin 14 is Black/ White)

[JiXer]

On the unloader realy.... is it safe to assume that when swapping a 24v motor in, using an OBD1 e36 harness.... You can splice the Blk/Grn wire that goes to the starter directly to the Blk/Ylw starter wire?

Also, it seems that there are 2 tach signals going through the x20 connector, Pin 14 which is Blk/Blu and Pin 20 which is solid black. I believe pin 14 is supposed to connect to c104 and from what I can tell, pin 20 must connect directly to the cluter?

Can anyone confirm this?

[M3 euro ltw]

Part #3 above

********** Edited *********
I've edited my prior one to thank people for help on my first question.

... and altered this one to pose a different question about the C101 and C104 issues that are more on topic to the thread.

**********

Does anyone have a part number for the engine harness side of the C104 connector and its correct pins?

**********

[BeirBrennerE30]

Not a big fan of that... I'd use a DME coolant temp sensor (obd1 sensor would be fine) in the port in the head, then find somewhere else to put the gauge sensor... Although it has to be metal, so it has a ground...

[ATTACH]29368[/ATTACH]

Looking at that picture, I think I might put the gauge sensor #18 and the DME sensor to be in the #4 spot

That's a tough one.

DME sensor has to go at 18. DME needs an accurate signal for engine temp compensation before the thermostat opens