Quote:
Originally Posted by Dav L
The "potentiometer" is really called a Throttle Position Sensor.
The "motor" might be an Automatic Idle Speed Motor (AIS). That adjusts the air bypass to control idle speed. Not sure if an F53 uses this or not.
Any other motor is for Cruise control. Not sure if F53 uses an electric motor or vacuum.
I don't think there are more than one TPS.
I doubt the whole throttle body was needed. But hopefully it's fixed.
A good diagnostician with a decent scan tool should have been able to nail the issue using State Displays ie: to see the TPMS voltage output across idle to full throttle.
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The motor is not an idle speed motor. The motor opens and closes the throttle plates via a signal from the accelerator pedal position sensor. This is referred to as 'drive by wire'.
There is only one TPS. The potentiometer is a coil inside the TPS which has a brush which sweeps across the coil to change the resistance value through the sensor to change the voltage output in relation to the amount of throttle opening. The potentiometer would look something like a rheostat in a headlamp switch which controls the output to the instrument panel lamps. The TPS output is sent to the ECU which adjusts the amount of fuel required for the throttle valve opening.
I have replaced a few TP sensors on Ford V-10's but only one throttle body. That throttle body was on a high mileage low maintenance F-350 pick up which hauled a cattle trailer. The throttle plate shaft was worn, the brass bushings were partially missing and the shaft had actually worn into the body housing. Very erratic voltage readings from the TPS.
Lynn