Throttle Position (TP) Sensor, Checking

Throttle Position (TP) Sensor, Checking







Recommended special tools and equipment
- VAG1526A multimeter
- VAG1594A connector test kit
- VAG1598/31 test box

Both Throttle Position (TP) sensor -G79- and Accelerator Pedal Position Sensor 2 - 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.

If specified values are not obtained:

Checking wire connections
- Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected.







- 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 Ohms
- Check wires for short circuit to each other, to B+ and Ground (GND).

- Specified value: Infinity ohm (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
1. Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.