Tacho output while using stepper motor

[Noël]

Hello there,

I've been using the search function but couldn't really find a good answer. I'm currently building my MS2 with v3.0 PCB. And I am wondering how I could get a working tacho output. My stock ECU sends out the signal to my tachometer now and I won't be able to use IAC outputs since my engine uses a 4 pin stepper motor.

I found this scheme:



But what is meant by "selected pin on the PCB"?

Help would be appreciated

[billr]

What is the CKP wheel? (How many teeth, any missing-teeth).

[Noël]

My engine has a 60 - 2 CKP ;)

[jsmcortina]

But what is meant by "selected pin on the PCB"?

It is a generic diagram. You have to decide what processor output is going to be used to control that circuit.

James

[Noël]

Okay, and I'll have to configure that output as "RPM" in MegaTune? Or do I just sound kind of stupid right now? :p

[elmanre]

Okay, and I'll have to configure that output as "RPM" in MegaTune? Or do I just sound kind of stupid right now? :p

Depends on your setup, you can use the negative leg of led D15 to make your rpm tachoutput, it is pretty easy if you have knowledge in basic electronics, and you can take the signal out in SPR1-4
Then, select in tunerstudio your tachoutput port:

Basic/Load Settings > Tacho output

Select enable, then Output On: D15

[Noël]

So if I build the scheme I posted earlier in the proto area using the negative of D15 i'll be all good


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