Throttle position sensor, checking: Function
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Volkswagen Jetta, 2002 Volkswagen GTI, 2001 Volkswagen Jetta, 2001 Volkswagen GTI, and 2000 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
The two sensors, Throttle Position (TP) Sensor G79 and Accelerator Pedal Position Sensor 2 G185 , are both on the accelerator and communicate the driver action to the engine control module independently of each other. The sensors are housed in one casing.