1. Connect the VAG 1551 fault code reader (V.A.G 1552) and dial «01» «Engine electronics». The engine must be running at idle. The display should show the following information:
2. Click «08» to select a function «Reading a block of measured values» and confirm by pressing the button «Q». The display should show the following information.
3. Select the desired group. Click «062» for selection «Group 62 display» and confirm by pressing the button «Q». The display should show the following information:
4. Check the specifications for sensor 1 G79 in zone 3: 3-100%. Check the specifications for sensor 2 G185 in zone 4: 3-100%.
The engine control unit calculates the voltage value of the steering angle sensor as a percentage relative to 5 Volts and displays this percentage (5 volts equals 100%).
5. Depress the accelerator pedal slowly until it is fully depressed and observe the change in the values in fields 3 and 4 of the display. The percentages in both fields should increase equally.
6. If the specified value is not reached, adjust the position of the accelerator pedal 2 with the adjusting bolt 1 (pic. 4.18).
7. If the set value is not reached:
- click «→».
- click «06» to select a function «Output Completion» and confirm by pressing the button «Q»;
- turn off the ignition.
8. If the required value is not indicated on the display, check the supply voltage and sensor wires.
Checking the supply voltage and wires to the control unit
9. Remove a ware box from outside the driver.
10. Disconnect the six-pin harness connector from the accelerator pedal position sensor.
11. Turn off the ignition.
12. Connect a multimeter to measure the voltage between the connector pins (pic. 4.19): pin 2 + «weight», pin 2 + 3, pin 5 + «weight», pin 5 + 4. Specification value: 5 V minimum.
12. Turn off the ignition.
13. If the specified value is not reached: connect the tester VAG 1598/18 to the wiring harness of the engine control unit. The control unit must be disconnected (pic. 4.20).
14. Check the wire between the tester and the connector for an open circuit.
pin 1 + socket 35, pin 2 + socket 73, pin 3 + socket 36, pin 4 + socket 33, pin 5 + socket 72, pin 6 + socket 34. Setpoint: max. 1.5 ohm.
15. In addition, check the wires for a short to the positive pole or to «mass».
16. In addition check up short circuit one on another wires.
17. If no faults are found, replace the accelerator pedal position sensor.
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