With Generic Scan Tool

Throttle Position (TP) sensor, checking

Recommended special tools and equipment

- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 Connector test set
- 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 Intake Air Temperature (IAT) 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, connect test box for wiring test. Test Box, Connecting For Wiring Test






- 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: Infinite 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), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes