circuit to use GM temperature sensors for voltage based data acquisition input?

[rr]

Jason,

The coolant & iat/mat sensors are thermistors. Just use a pullup to
10 volts with the other end grounded. GM uses both a 1K & 384
ohm pullup. The ecm will change it for greater or less resolution.

The tps is a variable resistor, just feed it the 10v and ground the other end.
The wiper goes to the data-acq.

The map is a 5v device, period. Give it 5v and it will be happy. 0 - 5v out.

You can check the ecm schematics on Ludis's site for additional info.

BobR.

Jason R. Haines wrote:

> I want to build a circuit to use the stock GM sensors in a standalone type
> of application (not as part of the GM wiring harness/ECM). I have 5 volt, 10
> volt, 12 volt and 13.8 volt power supplies already available in the data
> acquisition system. I want as close to the full 10 volt range as possible
> for the input into the data acquisition to improve reasolution and accuracy.
> Yes, I could use 0 to1 volt but I'd rather not if I don't have to (the
> display and transfer function is programmable so it doesn't even have to be
> linear although it makes it much easier if it is).
>
> Jason
>

<snip>


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