The ECU uses the information to determine how much fuel to inject. The TPS picks that information and relays it to the car’s engine control unit (ECU). Conversely, it will be almost fully closed when you completely release the accelerator.Īs you manipulate the accelerator, the throttle position controls the amount of air flowing into the engine intake manifold. The valve will be fully open when the pedal is on the floor. That, in turn, is determined by how far down you have pushed the accelerator pedal. Now, with that said, exactly how does a throttle position work? It basically regulates how open the throttle valve is. You will notice this when you pull live data using a scan tool. It will also run efficiently and maintain optimum fuel economy. If the throttle position sensor is working properly, the car will move, coast, cruise, or accelerate smoothly. The engine then uses that data, alongside other values like RPM, air temp., and mass air flow in determining how much fuel to inject. ![]() While there, the TPS will continually measure the amount of air. It picks up air from the intake, passes it through the mass airflow sensor and into the throttle body. The engine needs those two to stay running. What Does a Throttle Position Sensor Do?Īs part of the fuel management system, the throttle position sensor helps to ensure that the correct mixture of fuel and air is delivered to the car’s engine. you can always diagnose both the sensor and its circuit with a scan tool. As you can see, there are cables running to and from the sensor to complete the sensor’s circuit. The throttle body is the silver-colored component on which the throttle position sensor is attached. It’s usually mounted on the butterfly spindle (also known as butterfly shaft) of the throttle body.įrom there, the sensor can directly and accurately monitor the position of the throttle. What is a Throttle Position Sensor?Ī throttle position sensor is a type of sensor that monitors the air intake of a vehicle’s engine. ![]() If it fails, the car will lack power and might turn itself off. That’s very important because the throttle position sensor (TPS) is an integral part of the car’s fuel management system. A good scan tool can help you test the throttle position sensor of your car.
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