Tps Wiring

[tractor]

just trying to wire up tps sensor but megajolt instructions only list there tps colours anybody know which one are which or testing method my wires are yellow blue black

[steve in stockport]

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.

 

 

[tractor]

cheers steve followed your advice but stuck now till I can connect to pc

[tractor]

cheers steve followed your instructions now working and calibrated