THROTTLE POSITION SENSOR - TPS SENSOR

POST UPDATED IN September, 2020

What is the TPS sensor?

The TPS sensor is a device that is simply a potentiometer, which is located to the axis of the throttle butterfly. It consists of a linear variable resistance, which is fed by a voltage of 5 volts that varies the proportional resistance with respect to the effect caused by this signal.

It usually has 3 wires that are: One reference 5 volts, another ground and the third is a return signal.

This moves at certain angles, in accordance with the acceleration, with the maximum angle moving at approximately 100 degrees, and when it is at 0 degrees the throttle valve is closed.

How does the TPS throttle position sensor work?

The Throttle Position Sensor (TPS) is responsible for studying the position of the throttle valve of the air inlet that goes to the engine, sending a signal to the ECM (Engine Control module) that uses this information to control the times of fuel injection to the combustion chambers. When the engine is idling, the Throttle Position Sensor (TPS) sends a signal equivalent to 0 degrees towards the Engine Control Module (ECM), taking control of the ECM on the engine revolutions depending on the coolant temperature of the engine, the gases that enter the engine and the electric charge requested by the car at that moment.

The signal that the TPS sensor delivers to the ECM (Motor Control Module) is a voltage signal, which varies with the position of the accelerator. When the vehicle is accelerated or idling, the TPS sensor output is low, within 0.4 to 0.8 volts. Depending on the acceleration, the signal voltage of the TPS will rise until it reaches its maximum value of total acceleration, which is between 4.5 to 5.0 volts.

 

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