2. Press "08" to select the "Read measured value block" function and confirm by pressing the "Q" button. The display should show the following information:
3. Select the desired group. Press "002" to select "Display Group 2" and confirm with the "Q" button. The display should show the following information:
Check the accelerator pedal position in field 2. The pedal should not be pressed and the display should show 0.0%. Check the readings in zone 3 at idle speed as well. The display should show 010.
[The information is available on the website www.vwmanual.ru]
4. Press the pedal all the way down and observe fields 2 and 3 of the display. The display should show the following information:
The percentage of accelerator pedal pressure should increase gradually. The display should show 100%. Check the readings in zone 3 at idle speed. The display should show 000.
5. If the specified value is not reached:
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- adjust the accelerator pedal position sensor.
6. If the display readings do not change or are unstable, check in the following order:
- press "→";
- press "06" to select the "Complete Output" function and confirm by pressing the "Q" button;
- turn off the ignition;
- disconnect wiring connector 1 from the accelerator pedal position sensor (Fig. 7.36);
- measure the resistance between contacts 1 and 3 of the wiring connector (Fig. 7.37). Specified value: accelerator pedal in idle position - 1.0-1.5 kOhm, accelerator pedal in fully depressed position - 1.5-2.5 kOhm;
- measure the resistance between pins 2 and 6 of the wiring connector. Specified value: accelerator pedal in idle position - 0.8-1.5 kOhm;
- check the idle switch on the accelerator pedal position sensor. To do this, measure the resistance between contacts 4 and 6 of the wiring connector. Specified value: accelerator pedal in idle position - max. 1.5 kOhm, accelerator pedal in fully depressed position - ∞ Ohm.
7. If the specified value is not achieved, replace the accelerator pedal position sensor.
8. If the specified value is reached:
- connect the VAG 1598/22 tester to the engine control unit wiring harness (Fig. 7.38);
- check the wire between the tester and the socket for open circuit: contact 1 and socket 24, contact 2 and socket 11, contact 3 and socket 23, contact 4 and socket 12, contact 5 and socket 8, contact 6 and socket 25 (Fig. 7.39) Specified value: 1.5 Ohm;
- additionally, check the wires for short circuits to each other, to the vehicle ground, and to the positive battery terminal. Specification resistance: ∞ Ohm.
9. If no fault is found in the wires, replace the engine control unit.
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