Lexus Throttle Position Sensor

Choosing A Throttle Position Sensor

A throttle position sensor (TPS) sends information about the throttle plate's position to the engine control system. The correct replacement depends on the throttle assembly, mounting and electrical connections used by the vehicle. A-Premium offers separate sensors for selected applications, including designs with different terminal counts.

Compare the specified application and sensor mounting as well as the connector. Some vehicles use a sensor integrated into the throttle body, so determine whether the sensor is serviced separately on the installed assembly.

How A TPS Sensor Supports Engine Control

As the throttle plate moves, the sensor provides a changing position signal to the engine control unit. The control unit uses that information with other inputs to manage engine operation. In an electronic throttle system, the accelerator pedal has its own position signal; pedal movement and throttle plate position are related inputs, not the same measurement.

A faulty signal or connection can affect the information available to the control system. The exact response depends on the vehicle and the nature of the fault.

Throttle Sensor Symptoms And Diagnosis

Hesitation, unstable idle, reduced response or a check-engine light can point toward a throttle-control issue, but these symptoms also have other possible causes. Inspect the sensor connection and wiring and test the signal according to the vehicle's procedure before deciding which part needs replacement.

After repair, follow the specified installation and any learning procedure for that vehicle. A sensor replacement does not correct a damaged connector or a binding throttle plate by itself.

Frequently Asked Questions (FAQ)