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What is the structure of the throttle position sensor?

2 Answers

LeahMarie

07/25/25 4:38am

The throttle position sensor structure consists of a potentiometer and an idle contact. The function of the throttle position sensor is to convert the position or opening of the throttle into a voltage signal, which is transmitted to the electronic control unit (ECU) as the basis for the ECU to determine the engine operating conditions, thereby achieving fuel injection control under different throttle openings. The throttle position sensor is a very important sensor in the engine centralized control system, serving as the primary signal source for idle control, start acceleration control, rapid acceleration control, rapid deceleration control, fuel cut-off control, ignition advance angle control, gasoline vapor recovery control, and automatic transmission shift control.

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MariaLee

08/10/25 5:28pm

I disassembled this part last time, the throttle position sensor is mounted directly on the throttle shaft. Simply put, it looks like a matchbox-sized black plastic block with resin-encapsulated housing for moisture and shock protection. Inside are two key components: one is a potentiometer with a sliding contact - when you press the accelerator, the shaft rotates and the slider moves along the resistance track to change resistance value. The other is an idle contact switch that only clicks closed when the throttle is fully released. These two signals are transmitted to the ECU via three wires - reference voltage, signal output, and ground. Newer models now use Hall-effect sensors which are more durable with no physical contacts. Last repair job I encountered a classic case of unstable idle - disassembly revealed worn grooves on the resistance track, replacing it fixed the issue.

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