Audi Cars 1999-05

Testing 2

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Testing If Display Approx. 140.0 Degrees C:



  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  



Click image to see an enlarged view

Fig. Disconnect 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow)

  1. Disconnect the 2-pin harness connector at Engine Coolant Temperature (ECT) Sensor (arrow).
  2.  
  3. If the indication jumps to approx. -40.0 degrees C, end diagnosis, switch the ignition off, and replace the Engine Coolant Temperature (ECT) sensor.
  4.  
  5. If the indication remains at approx. 140.0 degrees C, end diagnosis, switch the ignition off and check the wiring.
  6.  
  7. Connect the test box to the wiring harness of the Motronic Engine Control Module (ECM).
  8.  
  9. Check the wires between the test box and the 2-pin connector for open circuits.

    Terminal 1 and socket 10
     
    Terminal 2 and socket 14
     

  10.  
  11. Wire resistance: max. 1.5 ohms
  12.  
  13. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  14.  
  15. Specified value: infinite ohms
  16.  
  17. If the wires are okay, use a multimeter and adapter cables from the connector test kit to measure the resistance at the connector to the Engine Coolant Temperature (ECT) Sensor terminals 1 and 2.

    Click image to see an enlarged view

    Fig. Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

  18.  
  19. Area A: Resistance values for temperature range 0 to 50 degrees C.
  20.  
  21. Area B: Resistance values for temperature range 50 to 100 degrees C.

    Click image to see an enlarged view

    Fig. Resistance read-out examples

  22.  
  23. Read-out examples:
    1. 30 degrees C is in range A and corresponds to a resistance of 1.5 to 2.0 kohms
    2.  
    3. 80 degrees C is in range B and corresponds to a resistance of 275 to 375ohms
    4.  

  24.  
  25. If the resistance is not okay, replace Engine Coolant Temperature (ECT) Sensor.
  26.  
  27. If the wires and resistance values are okay, replace Motronic Engine Control Module (ECM).
  28.  

 
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