Audi Cars 1999-05

Camshaft Position Sensor 2

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Testing



  1. Remove the engine cover with the air filter.

    Click image to see an enlarged view

    Fig. Disconnect the 3-pin harness connector (1) at the Camshaft Position (CMP) Sensor

  2.  
  3. Disconnect the 3-pin harness connector (1) at the Camshaft Position (CMP) Sensor
  4.  
  5. Switch the ignition on.

    Click image to see an enlarged view

    Fig. Measure the voltage between terminals 1 and 3 of the connector using a multimeter

  6.  
  7. Measure voltage between terminals 1 and 3 of the connector using a multimeter and the adapter cables from special tool connector test kit V.A.G 1594 C.
  8.  
  9. Specified value: 4.5 to 5.5 V
  10.  
  11. Switch the ignition off.
  12.  
  13. If the voltage is not okay, connect the test box to wiring harness of Motronic Engine Control Module (ECM).

    Click image to see an enlarged view

    Fig. Check wires between test box and 3-pin connector for open circuit

  14.  
  15. Check the wires between test box and 3-pin connector for open circuit.

    Terminal 1 and socket 26
     
    Terminal 2 and socket 44
     
    Terminal 3 and socket 14
     

  16.  
  17. Wire resistance: max. 1.5 ohms
  18.  
  19. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  20.  
  21. Specified value: infinite ohms
  22.  
  23. If the wires and voltage are okay, replace the Camshaft Position (CMP) Sensor.
  24.  


NOTE
Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) sensor.

  1. Remove the engine cover with the air filter.

    Click image to see an enlarged view

    Fig. Disconnect the 3-pin harness connector (1) at the Camshaft Position (CMP) Sensor

  2.  
  3. Disconnect the 3-pin harness connector (1) at the Camshaft Position (CMP) Sensor
  4.  
  5. Switch the ignition on.

    Click image to see an enlarged view

    Fig. Measure the voltage between terminals 1 and 3 of the connector using a multimeter

  6.  
  7. Measure voltage between terminals 1 and 3 of the connector using a multimeter and the adapter cables from special tool connector test kit V.A.G 1594 C.
  8.  
  9. Specified value: 4.5 to 5.5 V
  10.  
  11. Switch the ignition off.
  12.  
  13. If the voltage is not okay, connect the test box to wiring harness of Motronic Engine Control Module (ECM).

    Click image to see an enlarged view

    Fig. Check wires between test box and 3-pin connector for open circuit

  14.  
  15. Check the wires between test box and 3-pin connector for open circuit.

    Terminal 1 and socket 26
     
    Terminal 2 and socket 44
     
    Terminal 3 and socket 14
     

  16.  
  17. Wire resistance: max. 1.5 ohms
  18.  
  19. Check the wires for short circuit to each other, to Battery (+) and Ground (GND).
  20.  
  21. Specified value: infinite ohms
  22.  
  23. If the wires and voltage are okay, replace the Camshaft Position (CMP) Sensor.
  24.  

1.8L Engines

NOTE
Battery voltage must be 11.5 volts minimum before starting any testing.



Click image to see an enlarged view

Fig. Showing the 3-pin camshaft position sensor connector

  1. Disconnect camshaft position sensor 3-pin harness connector.
  2.  
  3. Switch the DMM to the voltage measurement range.
  4.  
  5. Connect the DMM between the outer terminals of connector, using jumper wires from VW 1594.
  6.  
  7. Switch the ignition to 'ON', but Do NOT start the engine. You should see a minimum of 4.5 volts.
  8.  
  9. Now, switch the ignition 'OFF'.
  10.  
  11. Connect a test box VAG 1598/22 to the ECM harness connector.
  12.  
  13. Check the wiring between the test box and the ECM harness connector, using a wiring diagram. Checks should be made at each of the following points:
  14.  


    Terminal 1 and socket 11
     
    Terminal 2 and socket 76
     
    Terminal 3 and socket 67
     

  15. For each of the above checks, the maximum resistance should not exceed 1.5 ohms.
  16.  
  17. Check all wires for shorting to one another. If these are not shorted, there should be infinite ohms on each wire.
  18.  
  19. If wiring the OK and there is voltage present between terminals 1 and 3 , replace the camshaft position sensor.
  20.  
  21. If wiring is OK, but NO voltage is present between terminals 1 and 3 , replace the ECM.
  22.  

2.8L

NOTE
Battery voltage must be 11.5 volts minimum before starting any testing.



Click image to see an enlarged view

Fig. Camshaft position sensor connectors on 2.8L engines

  1. Disconnect the 3-pin harness connectors from the Camshaft Position (CMP) sensors.
  2.  


    A-CMP sensor, cylinder bank 1, right front
     
    B-CMP sensor, cylinder bank 2, left rear
     




Click image to see an enlarged view

Fig. Identifying terminal locations on the camshaft position sensor connector (2.8L engines)

  1. Connect the DMM to measure voltage across the CMP connector terminals 1 (B+) and 3 (Ground), using adapters from VW1594 connector test kit.
  2.  
  3. Switch ignition to 'ON', but Do NOT start engine.
  4.  
  5. Measure voltage between terminals 1 and 3 . There should be a minimum 9.0 volts.
  6.  
  7. Switch the ignition 'OFF'.
  8.  
  9. Connect a VAG1598/22 test box to the ECM harness connector.
  10.  
  11. Check the wiring for open circuit between the ECM test box and 3-pin harness connector, according to the wiring diagram.
  12.  
  13. For the CMP sensor connector on the right cylinder head, measure as follows:
  14.  


    Connector terminal 1 to ECM test box socket 11
     
    Connector terminal 2 to ECM test box socket 76
     
    Connector terminal 3 to ECM test box socket 67
     


For these checks, the specification should show a maximum resistance of 1.5 ohms.

  1. For the CMP sensor on the left cylinder head, measure as follows:
  2.  


    Connector terminal 1 to ECM test box socket 11
     
    Connector terminal 2 to ECM test box socket 44
     
    Connector terminal 3 to ECM test box socket 14
     


For each of these checks, the specification should show a maximum resistance of 1.5 ohms.

  1. Check the wiring for short circuits to one another. The DMM should show infinite ohms.
  2.  
  3. If the wiring is OK, and voltage across terminals 1 and 3 is OK, replace camshaft position sensor.
  4.  
  5. If the wiring is OK, but there is still no voltage across terminals 1 and 3 , replace the ECM.
  6.  

CMP Sensor Functional Test
  1. For a functional check of camshaft position sensor, disconnect the 4-pin connector from the ignition coil power output stage and check DTC memory.
  2.  
  3. Check the camshaft position sensor voltage supply and ensure it is OK.
  4.  
  5. Push back the rubber boot on the CMP sensor connector (sensor remains connected).
  6.  
  7. Connect a VAG 1527B voltage tester between terminal 1 (B+) and 2 (signal).
  8.  
  9. Crank the engine over for several seconds.
  10.  
  11. The voltage tester must flash briefly for every second engine rotation.
  12.  

If voltage tester does not flash, switch the ignition off and disconnect the 3-pin harness connector from the camshaft position sensor.

  1. Connect a VAG 1598/19 test box to the ECM harness connector.
  2.  
  3. Check the signal wire for continuity between harness connector terminal 2 and test box socket B2 . There should be a maximum resistance of 1 ohm.
  4.  
  5. If the specified value is not obtained, check for possible short or open circuit in wiring between the CMP sensor harness connector and the ECM harness connector.
  6.  
  7. If the wiring is OK, connect a DMM between test box socket B2 and a vehicle ground.
  8.  
  9. Turn the ignition switch to 'ON'. There should be a minimum of 4.0 volts.
  10.  
  11. If the specified value is not obtained, replace the ECM.
  12.  
  13. If the specified value is obtained, replace the Camshaft Position (CMP) sensor.
  14.  

 
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