With Generic Scan Tool

Throttle Position (TP) Sensor, Checking

Recommended special tools and equipment







- VAG1526A hand multimeter
- VAG1594A connector test kit
- VAG1598/31 test box

Both the Throttle Position (TP) sensor -G79- and the Sender -2- for accelerator pedal position -G185- are located at the accelerator pedal and communicate the driver's intentions to the ECM completely independently of each other. Both sensors are stored in one housing.

Test requirement:
- Fuses for engine electronics OK

Work procedure
- Remove driver-side storage compartment.







- Disconnect electrical harness connector -2-.


Checking voltage supply
- Switch ignition on.







- Connect multimeter for voltage measurement as follows.

Harness connector Terminal Specified value
1 + Ground (GND) about 5 V
1 + 5 about 5 V
2 + Ground (GND) about 5 V
2 + 3 about 5 V

- Switch ignition off.

Checking wire connections
- Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected. Test Box, Connecting For Wiring Test







- Check the following wire connections for open circuit according to wiring diagram:

Harness connector Terminal Test box Socket
1 72
2 73
3 36
4 35
5 33
6 34

- Specified value: Wire resistance max 1.5 Ohm

- Also check wires for short circuit to each other, to B+ and Ground (GND).
- Specified value: Infinite Ohms (no continuity)

- If necessary, repair wire connection.

If no malfunction is detected in the wiring and if the voltage supply was OK:
- Replace accelerator pedal module.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check DTC memory, see "Mode 3: Check DTC memory". Diagnostic Mode 3: Check DTC Memory
2 - If necessary, erase DTC memory, see "Mode 4: Reset/erase diagnostic data". Diagnostic Mode 4: Reset/Erase Diagnostic Data
3 - Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.