This allows the sensor to accurately track the position of the throttle plate. All the wires are connected to the car computer.Ī four-wire throttle valve sensor contains two potentiometers, so it uses two signal wires to read the output of each potentiometer. The electronic control unit Supplies 5 volts of power (reference voltage) to the throttle sensor via a “hot power” wire. The two signal wires are responsible for transmitting the throttle position data to the ECU, while the other two wires are used for grounding and power. A four-wire throttle valve sensor has four wires, two are the signal wires, and two are earth and hot.Ī four-pin throttle valve sensor has two potentiometers inside which have common earth and hot wires. These kinds of sensors are used in cable-operated throttle bodies.Ĥ Pin Throttle Position Sensor Wiring Diagram 4 Pin Throttle Sensor Harness SchematicsĪ throttle valve sensor is a type of sensor used in automotive applications to monitor the position of the throttle. The ECU monitors the signal wire and uses it to calculate the engine’s throttle position. The sensor’s signal output wire should, ideally, be close to 0V when the throttle is closed and close to 5V when the throttle is wide open. This wire can generate a 0 to 5-volt signal. This wire offers ground to the sensor.Ī third wire is a signal wire which sends the information (signal) from the sensor to the engine control unit through this wire. The ground wire is additionally taken from the ECU. This reference potential means that the auto ECU Provides 5-volt power to the throttle sensor through this wire. The hot wire is a feed source that is taken from the automotive electronic control unit.
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