Throttle Position Sensor, Checking

Both Throttle Position (TP) Sensor G79 and Accelerator Pedal Position Sensor 2 G185 are located at the accelerator pedal and communicate the drivers intentions to the ECMs completely independently of each other. Both sensors are integrated into one housing.

NOTE:

Observe safety precautions → Safety Precautions .
Observe rules for cleanliness → Clean Working Conditions .
When servicing terminals in the harness connector for the Intake Air Temperature (IAT) sensor, use only gold-plated terminals.

Special tools, testers and auxiliary items required

Hand multimeter V.A.G 1526 or Multimeter V.A.G 1715
Test adapter kit V.A.G 1594
Wiring diagram
Battery voltage (both batteries) must be at least 11.5 Volts.

All electrical consumers such as, lights and rear window defroster must be switched off.
Parking brake must be engaged.
For vehicles with automatic transmission, selector lever must be in "P".
If the vehicle is equipped with an A/C system, this must be switched off.

The Ground (GND) connections between engine and body must be OK.
Fuses in right instrument panel fuse holder must be OK: → Electrical Wiring Diagrams, Troubleshooting and Component Locations

Right instrument panel fuse holder

Fig 1: Identifying Fuse Panel (Instrument Panel, Right)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Test Sequence

Remove cover in footwell (driver side).
Disconnect 6-pin connector from Throttle Position (TP) Sensor.
Switch ignition on.