With Manufacturer's Scan Tool

Throttle Position (TP) Sensor 1 -G79- And Sender -2- For Accelerator Pedal Position -G185-, Checking







Special tools and workshop equipment required
- V.A.G 1526 A Multimeter
- V.A.G 1594 A Connector test kit
- V.A.G 1598/31 Test box
- VAS 5051 Vehicle diagnostic, testing and information system
- VAS 5051/1 Adapter

Both the Throttle Position (TP) sensor 1 -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.

Work sequence
- Connect vehicle diagnostic, testing and information system VAS 5051 and select vehicle system "01 - Engine electronics" in selection.

When doing this the ignition must be switched on.







Display on VAS 5051:
- Under -1- select diagnostic function "08 - Read measured value block".







Display on VAS 5051:
1. Enter display group
- Enter "062" for "display group number 062" in field -2- and confirm entry by pressing -Q- button.







Display on VAS 5051:
- Check indication in display groups -3-and -4-.







NOTE: The Engine Control Module (ECM) converts and displays the voltage readings from the angle sensors as percentages of 5 V. (A 5 Volt supply corresponds to 100%).

- Observe readouts in display fields 3 and 4.
- Slowly depress accelerator pedal.

Percentage displayed in field 3 should rise evenly. Tolerance range from 12..0.97% is not fully utilized.

Percentage displayed in field 4 should also rise evenly. Tolerance range from 4...49% is not fully utilized.

NOTE: The value displayed in field 3 must always be about twice as large as that in field 4.

- Exit function "08 - Read measured value block" by pressing  button.

If the displays are not as described:
- Check Sender -2- for accelerator pedal position -G185- voltage supply and wiring.

Voltage supply for Throttle Position (TP) sensor -G79- and Sender -2- for accelerator pedal position -G185-, checking
- Remove driver's storage compartment:
- Disconnect connector for throttle position sensors.
- Switch ignition on.







- Connect multimeter as follows to measure voltage:

Connector Specified value
terminal
1 + ground (GND) approx. 5 V
1 + 5 approx. 5 V
2 + ground (GND) approx. 5 V
2 + 3 approx. 5 V

If specifications are obtained:
- Additionally check signal wires.

If the specified values are not obtained:

Check wiring
- Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module; do not connect Engine Control Module. Test Box, Connecting For Wiring and Component Test







- Check for open circuit and short to positive (B+) or ground (GND) in following wiring connection:

Connector Test box V.A.G 1598/31
terminal Socket
1 72
2 73
3 36
4 35
5 33
6 34

- Repair any open/short circuit as necessary.

If no malfunction is found in wires:
- Replace throttle position sensor(s).