Originally Posted by
Andreas
Would probably need something that could show it in a graph or something? So that any deviations from the linear increase/decrease would be visible. Just guessing though.
Would a oscilloscope or whatever they are called work?
Thats the best way measured at the ecu input pin
Originally Posted by
ossie cossie
Toyota fans on a FORD site good luck.
on a side note Flux capacitor, how would you test the TPS on a big turbo escort cosworth. Just incase i ever get dramas with mine.
Excluding a small turbo escort cossie.....
The cossie TPS is not a straight forward poteniometer.
When at idle, the wiper does
not make contact with the resistor.
As you apply movement, the wiper starts to touch one end of the resistor and then moves to the other like a normal potentiometer.
The outer pins are the resistor and can vary from about 1000 to 5000 ohms depending on type and age.
The escort will be around 4700 ohms.
The centre pin is the wiper and movement should cause a resistance increase on one outer pin and decrease on the other depending on direction and which outer pin you choose to test against.
Pin 17 on the weber ECU is the throttle input.
Use pin 11 as the earth for a voltmeter and oin 17 for positive.
4x4 vehicles (L8/P8) will have a voltage of about 0.1-0.5 volts at idle and 4.5 to 5.1 volts at full throttle.
2wd (L1/L6) will have a voltage of about 4.5 to 5.1 volts at idle and 0.1 to-0.5 volts a full throttle.
(Voltages given are rough taking into account measurement tolerances..etc)
Check the readings change smoothly when moving the throttle very slowly .
Any sudden jumps...change the sensor !
Assuming the Throttle butterfly and cable are ok, the best way to align the TPS to the throttle body is to loosen the 2 screws so the sensor is free to move by itself a bit and disconnect the loom.
Open teh throttle fully and allow it to snap shut by taking your foot of the pedal fast.
Then check the sensor rotates and springs back cleanly. Tignten screws, reconnect loom.
Hope that helps if only a breif explanation..lol