The throttle position sensor is a potentiometer, to one end of which the "plus" of the supply voltage (5 V) is supplied, its other end is connected to the "ground". From the third output of the potentiometer (from the slider) the output signal goes to the controller. When the throttle valve is turned (from the impact on the control pedal), the voltage at the output of the throttle position sensor changes. When the throttle valve is closed, it is below 0.7 V. When the throttle valve opens, the voltage at the TPS output (throttle position sensor) increases and with the throttle fully open it should be more than 4 V. Monitoring the output voltage of the TPS (throttle position sensor), the controller adjusts the fuel supply depending on the throttle opening angle (i.e. at the driver's discretion). The throttle position sensor does not require adjustment, since the controller senses idle speed (i.e. complete closing of the throttle valve) as a zero mark.
In case of TPS malfunction (throttle position sensor) the controller stores the sensor fault code in memory, turns on the engine management system indicator lamp and calculates the expected value of the throttle valve opening angle based on the crankshaft speed and air mass flow.
To replace the TPS on a vehicle (throttle position sensor) the following must be done.
1. Disconnect the wire from the negative terminal of the battery.
2. Disconnect the wiring harness connector from the TPS terminals (throttle position sensor), by pressing the plastic latch.
3. Remove the two mounting screws and remove the throttle position sensor from the throttle assembly (for clarity, the throttle assembly has been removed).
4. Install a TPS on the vehicle (throttle position sensor) in reverse order. Pay attention to the condition of the sealing foam ring: if the ring is damaged, replace it with a new one.
[For more details, see the page LADAMAN]