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TPS specification

Posted: Wed Jul 28, 2010 11:19 am
by Noggy
Hi everyone.
I've been in and out of here for a few years, having previously built and used a Megasquirt, but have not registered before.
I have just ordered a MJLJ for my oval race car project, a 2 litre Zetec engined Toyota Starlet with Weber DCOEs fitted.
I have tried searching, but have been unable to find the info I need.........

I have access to fairly robust 4 wire TPSs, as used on fork lift trucks. Diagram below;

Image

Because of safety legislation these pots have dual tracks, but thats not an issue, I'll just use 1 track!

My question concerns what MJLJ requires electrically for a tps.

With the pot not connected if I measure between ground (pin 1) and Vref (pin 4) the resistance is 2k ohm.
If I measure between ground and O/P (pin 3) the restance range is between 1k75 and 3k75 ohm.

Before I start making a bracket to fit these type of pot to my Webers would someone be able to confim they will be ok?

Many thanks.

Posted: Wed Jul 28, 2010 9:48 pm
by BRUCEROE
The usual way to use a TPS, is apply +5V and ground to your pins 1 & 4. Then sense voltage out to the MJ from 2 or 3. Th MJ can supply the +5V. Exact resistance not important. Bruce Roe

Posted: Wed Jul 28, 2010 10:11 pm
by Noggy
BRUCEROE wrote:.....Exact resistance not important......
Good news, thank you.