ford tps
Posted: Mon Sep 22, 2008 5:56 am
has anyone got the wiring info for a ford tps of a ford mondeo it has white, yellow and brown?
I don't, but here's a way to test it on your own. The easiest way to check a TPS is to unplug it and put an ohmmeter on its pins. Observe the resistance as the throttle opens and closes. Each pair of pins will behave differently:
The resistance between the VREF and ground pins will remain constant.
The resistance between the ground and signal pins will be low with the throttle closed and high with the throttle wide open.
The resistance between the VREF and signal pins will be high with the throttle closed and low with the throttle wide open.
If your sensor behaves like this, it will be pretty straightforward to connect it to Megasquirt.
If the resistance jumps from infinite (or near infinite) to near zero, you have a switch type throttle position sensor, or possibly a seriously defective potentiometer type TPS. These do not provide very much information that Megasquirt needs, as it can tell if you are at idle or full throttle by the MAP sensor information. You can still use MAP based acceleration enrichment and ground the TPS signal pin through a resistor.