Angle Sensors For Throttle Drive, Checking

Angle Sensors For Throttle Drive, Checking

Special tools and equipment






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

or

- VAG1551 with VAG1551/3B

Angle sensor 1 for throttle drive (power accelerator actuation) -G187- and angle sensor 1 for throttle drive (power accelerator actuation) -G188- inform the Engine Control Module (ECM) about the position of the throttle valve. Both angle sensors are located in the throttle valve control module.

Test sequence
- Connect VAS5051 tester or VAG1551 scan tool and select the control module for engine electronics using "address word" 01. Connecting VAS 5051/VAG1551 Scan Tool
Ignition must remain switched on for this.

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

Indicated on display:


Read Measuring Value Block Q
Input display group number XXX


- Press buttons -0-, -6- and -2- to select "display group number 062" and press -Q- button to confirm input.

Indicated on display


Read Measuring Value Block 62 ->
1 2 3 4


- Check specified value for E-Gas potentiometer voltages.

Display Group 062:

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

- Observe display field 1 and 2.
- Slowly depress accelerator pedal completely.

Percent indication in display field 1 must rise uniformly. In the process, the tolerance range of 3 to 93% is not completely utilized.

Percent indication in display field 2 must decrease uniformly. The tolerance range 97 to 3 % is not used completely during this.

NOTE:
- The reason why the value indicated in display field 1 climbs, while the value indicated in display field 2 decreases, has to do with the fact that the potentiometers (angle sensors) in the throttle valve control unit run in opposite directions.
- This means that the voltage of angle sensor 1 runs from 0 to 5 volts. (The more the throttle valve is opened, the larger the voltage; percent indication climbs).
- The voltage of angle sensor 2 runs from 5 to 0 volts. (The more the throttle valve is opened, the lower the voltage; the percentage decreases).

If indications do not resemble description:
- Check voltage supply and wire connections of throttle valve control module. Pay particular attention to harness connectors that could be loose or corroded.
- Check accelerator pedal position sensor. Throttle Position (TP) Sensor and Sender - Accelerator Position

Check voltage supply throttle valve control module
- Pull connector (2) off throttle valve control module.
- Switch ignition on.






- Connect multimeter for voltage measurement as follows:

Harness connector Specified value
Terminal
2 + Ground (GND) about 5 V
2 + 6 about 5 V

If specified values are obtained:
- Also check signal wires and activation wires of throttle valve actuator.

If specified values are not obtained:
- Check wire connections from Engine Control Module (ECM) to throttle valve control module.

Checking wire connections






- Pull connector (2) off throttle valve control module.
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM. Wiring and Component Testing Using VAG1598/31 Test Box
- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Harness connector VAG1598/31 test box
Terminal Socket
1 92
2 83
3 117
4 84
5 118
6 91

- Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires:
- Replace throttle valve control module.