TPS wiring

[JSF55]

Just about to start conecting my MS1 to everything, does anyone know the correct wiring for the TPS ? thanks john

[kev_the_mole]

Megamanual says

There are two wires on the external wiring schematic that go from MegaSquirt® into the TPS sensor. These two MegaSquirt® wires are +5 Vref signal and a sense line. There is a third wire going to ground. Assuming that you have a proper potentiometer TPS, then +5 Vref goes to one side of the pot, the other side goes to ground and the sensor line is hooked to the wiper.

To hook up your throttle position sensor (TPS), disconnect the TPS, and use a digital multi-meter. Switch it to measure resistance. The resistance between two of the connections will stay the same when the throttle is moved. Find those two - one will be the +5 Vref and the other a ground. The third is the sense wire to the MegaSquirt® controller. To figure out which wire is the +5 Vref and which is the ground, connect your meter to one of those two connections and the other to the TPS sense connection.

If you read a high resistance which gets lower as you open the throttle, then disconnected wire is the one which goes to ground, the other one which had the continuous resistance goes to the +5 Vref from the MegaSquirt® EFI Controller, and the remaining wire is the TPS sense wire.

Once you have worked that out which is the sense wire it goes to pin 22 as per this drawing. This drawing is for my two injector Healey 6-cylinder conversion (currently on hold ) so ignore the rest.



Cheers,

Ian

[JSF55]

Cheers mate gives me something to go on, john