Throttle position sensor

[sideways danny]

ahh, you're using one of the newer sort. I fitted a 5 dial type

I'd say find a TPS from an auto s13, the 7v signal wire you've identified is I think the wrong one for this.

[silviagod]

The remaining two wires give a constant 0 Volts and 12 Volts.

[wacomuk]

Paul set it for HARD DRIVING! you know you want to

[silviagod]

I am waiting to see if Apexi email me back if not I may try to make a potential divider with some resistors and hope it doesn't effect the signal doing to the automatic transmission control unit.

[30psi]

The S12 auto TPS is simply 2 switches in one. It provides a full throttle signal and an idle signal, with no variance in between.

If you use an S13 one, it has an additional plug come from the rear of the the unit then provides the variable signal.

Only issue, is that you may need to supply 5v (guess) to it for the signal to be similar to how it would be on an S13.

The answers to your problem are in the S13 service manual. Rather than look at the wiring diagrams if you look at the tests for the TPS it should show the switching side and the potentiometer side of things.

[silviagod]

Thanks 30 PSI. The throttle contacts on my S12 Auto and on the other one I have do have an additional plug underneath with a voltage that varies from 0.5 Volts to 6.95 Volts depending upon the position of the throttle and I was hoping to tap into that signal for the SAFC II. I also haven't had a reply from Apexi yet.

[30psi]

So your auto TPS also has the variable bit on it, but uses 7V as a base? Didn't know that, I thought it just had the idle and full throttle switches.

I guess Apexi is only happy with a 5V base?