Audi Cars 1999-05

Oxygen Sensor 2

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Testing



  1. If the specified values are obtained, end the diagnosis and switch the ignition off.
  2.  
  3. If the specified values are not obtained, end the diagnosis and let the engine continue to run at idle.
  4.  
  5. Check the primary voltage.

    Click image to see an enlarged view

    Fig. Remove right vehicle floor cover (see arrows)

  6.  
  7. Remove the right vehicle floor cover.

    Click image to see an enlarged view

    Fig. Disconnect brown 4-pin harness connector (arrow) to Oxygen Sensor

  8.  
  9. Disconnect the brown 4-pin harness connector to the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).

    Click image to see an enlarged view

    Fig. Measure voltage at terminals 3and4 of connector to the ECM

  10.  
  11. Measure the voltage at terminals 3and 4 of the connector to the Motronic Engine Control Module (ECM) using a multimeter and the adapter cables from the connector test kit.
  12.  
  13. Specified value: 0.400 to 0.500 Volts
  14.  
  15. Switch the ignition off.
  16.  
  17. If the voltage is okay, replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).
  18.  
  19. If the voltage not okay, check the oxygen sensor wiring.
  20.  
  21. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).

    Click image to see an enlarged view

    Fig. Check wires between test box and 4-pin connector for open circuit

  22.  
  23. Check the wires between the test box and the 4-pin connector for open circuit.

    Terminal 3 and socket 76
     
    Terminal 4 and socket 77
     

  24.  
  25. Wire resistance: max. 1.5 ohms
  26.  
  27. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  28.  
  29. Specified value: infinite ohms
  30.  
  31. If the wires are okay, replace Motronic Engine Control Module (ECM).
  32.  


NOTE
The vehicle must be raised before the connector for the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) is accessible.


NOTE
When servicing terminals 3 and 4 in the harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC), use only gold-plated terminals.

  1. Connect the vehicle to the diagnosis and service system.
  2.  
  3. Start the engine and let it run at idle.
  4.  
  5. Under the address word "33 - On Board Diagnostic (OBD)", select "Diagnostic mode 6: Check test results of components that are not continuously monitored" .
  6.  
  7. Select "Test-ID 02: Oxygen sensor monitoring behind catalytic converter" .
  8.  
  9. Select following Test-ID.
  10.  
  11. Check the specified values at idle.
  12.  

1Rich to lean sensor barrier voltage-0.6241 V
2Lean to rich sensor barrier voltage-0.6241 V
7Minimum voltage at sensor for test cycle-0.450 V
8Maximum voltage at sensor for test cycle0.450 V-
129Sensor voltage lean00.6241 V
130Sensor voltage rich0.6241 V1.2998 V
131Deceleration test0 V0.1599 V
  1. If the specified values are obtained, end the diagnosis and switch the ignition off.
  2.  
  3. If the specified values are not obtained, end the diagnosis and let the engine continue to run at idle.
  4.  
  5. Check the primary voltage.

    Click image to see an enlarged view

    Fig. Remove right vehicle floor cover (see arrows)

  6.  
  7. Remove the right vehicle floor cover.

    Click image to see an enlarged view

    Fig. Disconnect brown 4-pin harness connector (arrow) to Oxygen Sensor

  8.  
  9. Disconnect the brown 4-pin harness connector to the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).

    Click image to see an enlarged view

    Fig. Measure voltage at terminals 3and4 of connector to the ECM

  10.  
  11. Measure the voltage at terminals 3and 4 of the connector to the Motronic Engine Control Module (ECM) using a multimeter and the adapter cables from the connector test kit.
  12.  
  13. Specified value: 0.400 to 0.500 Volts
  14.  
  15. Switch the ignition off.
  16.  
  17. If the voltage is okay, replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).
  18.  
  19. If the voltage not okay, check the oxygen sensor wiring.
  20.  
  21. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).

    Click image to see an enlarged view

    Fig. Check wires between test box and 4-pin connector for open circuit

  22.  
  23. Check the wires between the test box and the 4-pin connector for open circuit.

    Terminal 3 and socket 76
     
    Terminal 4 and socket 77
     

  24.  
  25. Wire resistance: max. 1.5 ohms
  26.  
  27. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  28.  
  29. Specified value: infinite ohms
  30.  
  31. If the wires are okay, replace Motronic Engine Control Module (ECM).
  32.  


NOTE
The vehicle must be raised before the connector for the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) is accessible.


NOTE
When servicing terminals 3 and 4 in the harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC), use only gold-plated terminals.

  1. Connect the vehicle to the diagnosis and service system.
  2.  
  3. Start the engine and let it run at idle.
  4.  
  5. Under the address word "33 - On Board Diagnostic (OBD)", select "Diagnostic mode 6: Check test results of components that are not continuously monitored" .
  6.  
  7. Select "Test-ID 02: Oxygen sensor monitoring behind catalytic converter" .
  8.  
  9. Select following Test-ID.
  10.  
  11. Check the specified values at idle.
  12.  

1Rich to lean sensor barrier voltage-0.6241 V
2Lean to rich sensor barrier voltage-0.6241 V
7Minimum voltage at sensor for test cycle-0.450 V
8Maximum voltage at sensor for test cycle0.450 V-
129Sensor voltage lean00.6241 V
130Sensor voltage rich0.6241 V1.2998 V
131Deceleration test0 V0.1599 V
  1. If the specified values are obtained, end the diagnosis and switch the ignition off.
  2.  
  3. If the specified values are not obtained, end the diagnosis and let the engine continue to run at idle.
  4.  
  5. Check the primary voltage.

    Click image to see an enlarged view

    Fig. Remove right vehicle floor cover (see arrows)

  6.  
  7. Remove the right vehicle floor cover.

    Click image to see an enlarged view

    Fig. Disconnect brown 4-pin harness connector (arrow) to Oxygen Sensor

  8.  
  9. Disconnect the brown 4-pin harness connector to the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).

    Click image to see an enlarged view

    Fig. Measure voltage at terminals 3and4 of connector to the ECM

  10.  
  11. Measure the voltage at terminals 3and 4 of the connector to the Motronic Engine Control Module (ECM) using a multimeter and the adapter cables from the connector test kit.
  12.  
  13. Specified value: 0.400 to 0.500 Volts
  14.  
  15. Switch the ignition off.
  16.  
  17. If the voltage is okay, replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).
  18.  
  19. If the voltage not okay, check the oxygen sensor wiring.
  20.  
  21. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).

    Click image to see an enlarged view

    Fig. Check wires between test box and 4-pin connector for open circuit

  22.  
  23. Check the wires between the test box and the 4-pin connector for open circuit.

    Terminal 3 and socket 76
     
    Terminal 4 and socket 77
     

  24.  
  25. Wire resistance: max. 1.5 ohms
  26.  
  27. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  28.  
  29. Specified value: infinite ohms
  30.  
  31. If the wires are okay, replace Motronic Engine Control Module (ECM).
  32.  


NOTE
The vehicle must be raised before the connector for the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) is accessible.


NOTE
When servicing terminals 3 and 4 in the harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC), use only gold-plated terminals.

  1. Connect the vehicle to the diagnosis and service system.
  2.  
  3. Start the engine and let it run at idle.
  4.  
  5. Under the address word "33 - On Board Diagnostic (OBD)", select "Diagnostic mode 6: Check test results of components that are not continuously monitored" .
  6.  
  7. Select "Test-ID 02: Oxygen sensor monitoring behind catalytic converter" .
  8.  
  9. Select following Test-ID.
  10.  
  11. Check the specified values at idle.
  12.  

1Rich to lean sensor barrier voltage-0.6241 V
2Lean to rich sensor barrier voltage-0.6241 V
7Minimum voltage at sensor for test cycle-0.450 V
8Maximum voltage at sensor for test cycle0.450 V-
129Sensor voltage lean00.6241 V
130Sensor voltage rich0.6241 V1.2998 V
131Deceleration test0 V0.1599 V
  1. If the specified values are obtained, end the diagnosis and switch the ignition off.
  2.  
  3. If the specified values are not obtained, end the diagnosis and let the engine continue to run at idle.
  4.  
  5. Check the primary voltage.

    Click image to see an enlarged view

    Fig. Remove right vehicle floor cover (see arrows)

  6.  
  7. Remove the right vehicle floor cover.

    Click image to see an enlarged view

    Fig. Disconnect brown 4-pin harness connector (arrow) to Oxygen Sensor

  8.  
  9. Disconnect the brown 4-pin harness connector to the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).

    Click image to see an enlarged view

    Fig. Measure voltage at terminals 3and4 of connector to the ECM

  10.  
  11. Measure the voltage at terminals 3and 4 of the connector to the Motronic Engine Control Module (ECM) using a multimeter and the adapter cables from the connector test kit.
  12.  
  13. Specified value: 0.400 to 0.500 Volts
  14.  
  15. Switch the ignition off.
  16.  
  17. If the voltage is okay, replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC).
  18.  
  19. If the voltage not okay, check the oxygen sensor wiring.
  20.  
  21. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).

    Click image to see an enlarged view

    Fig. Check wires between test box and 4-pin connector for open circuit

  22.  
  23. Check the wires between the test box and the 4-pin connector for open circuit.

    Terminal 3 and socket 76
     
    Terminal 4 and socket 77
     

  24.  
  25. Wire resistance: max. 1.5 ohms
  26.  
  27. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  28.  
  29. Specified value: infinite ohms
  30.  
  31. If the wires are okay, replace Motronic Engine Control Module (ECM).
  32.  

Fuel Mixture Control
  1. Turn the ignition switch to the OFF position.
  2.  
  3. Disconnect Heated Oxygen sensors electrical connector.
  4.  

Connect a suitable Digital Multimeter (DMM) to terminal No. 4 and ground of the connector from the O 2 S sensor. Measure the resistance to check for continuity between terminal No. 4 of the O 2 S sensor signal wire at the O 2 S sensor connector and engine ground. If continuity is not present, replace the heated O 2 S sensor.

  1. If continuity is present, check for a reference voltage between terminal No. 4 and engine ground. Using the 2 volt range of the DMM, switch the ignition ON and measure the voltage. The voltage should be 350-450 mV. If the voltage reading is not within specification, check the wiring from the ECM and the ECM.
  2.  

 
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