With Manufacturer's Scan Tool

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

Special Tools and equipment







- VAG1526A
- VAG1594A
- VAG1598/31
- VAS5051 with VAG5051/1

Both Throttle Position (TP) sensor -G79- and 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
- Connect vehicle diagnostic, testing and information system VAS 5051 and select vehicle system "01 -Engine electronics" in selection. Ignition must be switched on. Connecting VAS 5051/VAG 1551 Scan Tool (ST)

Display on VAS 5051:







- Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051:







1 - Enter display group, max. entered value = 255
- Enter "062" for "display group number 062" in field -2- and confirm entry by pressing -Q- button.

Display on VAS 5051:







- Check specifications for electronic throttle potentiometer voltages in display fields -3- and -4-.

Display Group 062:

NOTE: Engine Control Module (ECM) calculates voltage values of angle sensors in percent relative to 5 volts and displays these percentage values. (5 volts supply voltage represents 100%).

- Observe display field 3 and 4.
- Slowly depress accelerator pedal completely.

Percent indication in display field 3 must rise uniformly. The tolerance range 12 to 97% is not used completely during this.

Percent indication in display field 4 must also rise uniformly. In the process, the tolerance range of 4 to 49% is not completely utilized.

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

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

If indications do not resemble description:
- Check voltage supply and wire connections of sensor for accelerator pedal position.

Checking voltage supply of Throttle Position (TP) sensor
- Remove driver-side storage compartment.
- Disconnect harness connector for accelerator pedal position sensor.
- Switch ignition on.







- Connect multimeter for voltage measurement as follows:

Harness connector Specified value
Terminal
1 + Ground (GND) about 5 V
1 + 5 about 5 V
2 + Ground (GND) about 5 V
2 + 3 about 5 V

If specified values are obtained:
- Also check signal wires.

If specified values are not obtained:
- Check wire connections from Engine Control Module (ECM) to sensors for accelerator pedal position.

Checking wire connections
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Electrical Testing Using VAG1598/31 Test Box







- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Harness connector VAG1598/31 test box
Terminal Socket
1 72
2 73
3 36
4 35
5 33
6 34

- Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires:
- Replace accelerator pedal position sensor.