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. Press "002" to select the "Display Group 2" function and press "Q". The display should show the following information:
Continue the test only when the coolant temperature is above 80°C (display zone 2) and after the engine has been running for approximately 2 minutes at idle speed.
(The original information is posted on the website: «vwmanual.ru»)
4. Record the lambda probe voltage in zone 3. The voltage should change at least 10 times per minute in the range of 0-1.0 V. If the voltage changes more slowly, determine the malfunction.
5. Disconnect wiring connector 1 from oxygen sensor 2 (Fig. 3.39). The voltage should increase and then drop back to the previous level.
6. Reconnect the wiring connector. The voltage should drop and then rise back to its previous level.
7. Click "→".
8. Press "06" to select the "Complete Output" function and confirm by pressing the "Q" button.
9. Turn off the ignition.
10. Connect the VAG 1598/18 tester to the engine control unit wiring harness (fig. 3.34).
11. Connect the four-pin wiring connector to oxygen sensor 1 (Fig. 3.40).
12. Check the wires between the tester and the connector for open circuit: pin 3 + socket 15, pin 4 + socket 38. Specified value: max. 1.5 ohms.
13. Check the wires of contacts 3 and 4 for short circuits with the wires of contacts 1 and 2 according to the electrical connection diagram.
Specification resistance: ∞ Ohm.
14. If no fault is found in the wires, then replace the oxygen sensor.
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