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, 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 circuit 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 Throttle Position (TP) sensor, item 4.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes