Koso Tacho on SC ECU
Turbo Mini Forums

Anyone running a Koso dash off an Ecu feed? Can't get mine to work at all. The typhoon ecu has a setting for the pulse width but ive tried loads of values to no avail. SC say they have had problems with them before but some people mange to make them work (didn't know how tho!). Any pointers?

Are you talking about RPM signal or for other signals like temperature?

Have you verified that the Typhoon is outputting the signal as you expect, on the wire you expect and that the changes in software change the signal?

Edited by PhilR on 23rd Jun, 2015.

The RPM signal yeh, Is there a way of verifying it without a scope?

I guess i should check theres a voltage there?

From memory the SC ecu only outputs a pulsed gound signal. If you need a pulsed voltage signal you need to use a pull up resistor.

Ahh now theres mention of that somewhere in their manual. How does it work? It mentions a 100k resistor so im guessing you put 12v through the resistor into the ecu output and just piggyback the tacho input onto this?

If im thinking rightly you would get 12v with a low pulse every time the ecu grounds? (theres a setting in the Koso unit to look for a high pulse or a low pulse which is handy!)

my bad its a 1k resistor

Yep I used a pull up Resistor.

Class C 3rd Place Avon 2011 14.18 @101mph

Do you have a volt meter, to see if there's already 12V on the wire? It sounds odd that you'd need an external pull-up, but then, that's what their own documentation says. Try it and see what happens.

http://twinkam.co.uk/WebRoot/Store25/Shops...Up_Resistor.pdf

http://twinkam.co.uk/WebRoot/Store25/Shops...nstructions.pdf

I don't know the Typhoon software, but if there's a chance you need to turn the tacho output on, anything mentioning PWM is unrelated; That sounds like it's for some other outputs.