Throttle Position Sensors

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The TP (throttle position) sensors allow the ECM to determine the position and angular rate of change of the throttle blade.

There are two TP sensors located in the electronic throttle. See below for details of the electronic throttle.

If a TP sensor fails, the ECM:

Adopts a limp home mode where engine speed is limited to a maximum of approximately 2000 rev/min
Discontinues evaporative emissions control
Discontinues closed loop control of engine idle speed.

With a failed TP sensor, the engine will suffer from poor running and throttle response.