Throttle Position (TP) Sensor, Checking

Throttle Position (TP) sensor, checking

Recommended special tools and equipment
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Test requirement






- The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.

Function

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 sequence

Note: When servicing terminals in the harness connector for the Throttle Position (TP) Sensor, use only gold-plated terminals.

- Remove footwell cover (driver's side).

- Disconnect 6-pin connector from Throttle Position (TP) Sensor.

- Switch ignition on.

Checking voltage supply and wiring to control module






- Connect multimeter to the following connector terminals for voltage measurement.

Terminal 1 & Ground (GND)
Terminal 1 & 5
Terminal 2 & Ground (GND)
Terminal 2 & 3

Specified value: at least 4.5 V

- Switch ignition off.

If specified values are not obtained:

- Connect test box to control module wiring harness.






- Check wires between test box and 6-pin connector for open circuit according to wiring diagram.

Terminal 1 & socket 72
Terminal 2 & socket 73
Terminal 3 & socket 36
Terminal 4 & socket 35
Terminal 5 & socket 33
Terminal 6 & socket 34

Wire resistance: max: 1.5 Ohms

- Also check wires for short circuits to each other, to vehicle Ground (GND) and to B+.

Specified value: Infinity Ohms

If no malfunction is detected in the wiring and if the voltage supply was OK.

- Replace accelerator pedal position sensor.

- Erase DTC memory of Engine Control Module (ECM).

- Generate readiness code.