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    VW Passat & Audi A4 1990-2000

    Camshaft Position (CMP) sensor

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    OPERATION

    The camshaft position sensor provides information on the camshaft position. The ECM uses this information, along with the engine speed sensor information, to control the ignition timing and fuel injection synchronization.

    TESTING
    Audi A4 & Passat 1.8L

    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.  
    2. Switch the DMM to the voltage measurement range.
      3.  
    3. Connect the DMM between the outer terminals of connector, using jumper wires from VW 1594.
      4.  
    4. Switch the ignition to "ON", but Do NOT start the engine. You should see a minimum of 4.5 volts.
      5.  
    5. Now, switch the ignition "OFF".
      6.  
    6. Connect a test box VAG 1598/22 to the ECM harness connector.
      7.  
    7. 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:
      8.  
    8. Terminal 1 and socket 11
      9.  
    9. Terminal 2 and socket 76
      10.  
    10. Terminal 3 and socket 67
      11.  
    11. For each of the above checks, the maximum resistance should not exceed 1.5 ohms.
      12.  
    12. Check all wires for shorting to one another. If these are not shorted, there should be infinite ohms on each wire.
      13.  
    13. If wiring the OK and there is voltage present between terminals 1 and 3 , replace the camshaft position sensor.
      14.  
    14. If wiring is OK, but NO voltage is present between terminals 1 and 3 , replace the ECM.
      15.  

    Audi A4 & Passat 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.  
    2. A-CMP sensor, cylinder bank 1, right front
      3.  
    3. B-CMP sensor, cylinder bank 2, left rear
      4.  



    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.  
    2. Switch ignition to "ON", but Do NOT start engine.
      3.  
    3. Measure voltage between terminals 1 and 3 . There should be a minimum 9.0 volts.
      4.  
    4. Switch the ignition "OFF".
      5.  
    5. Connect a VAG1598/22 test box to the ECM harness connector.
      6.  
    6. Check the wiring for open circuit between the ECM test box and 3-pin harness connector, according to the wiring diagram.
      7.  
    7. For the CMP sensor connector on the right cylinder head, measure as follows:
      8.  
    8. Connector terminal 1 to ECM test box socket 11
      9.  
    9. Connector terminal 2 to ECM test box socket 76
      10.  
    10. Connector terminal 3 to ECM test box socket 67
      11.  

    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.  
    2. Connector terminal 1 to ECM test box socket 11
      3.  
    3. Connector terminal 2 to ECM test box socket 44
      4.  
    4. Connector terminal 3 to ECM test box socket 14
      5.  

    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.  
    2. If the wiring is OK, and voltage across terminals 1 and 3 is OK, replace camshaft position sensor.
      3.  
    3. If the wiring is OK, but there is still no voltage across terminals 1 and 3 , replace the ECM.
      4.  

    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.  
    2. Check the camshaft position sensor voltage supply and ensure it is OK.
      3.  
    3. Push back the rubber boot on the CMP sensor connector (sensor remains connected).
      4.  
    4. Connect a VAG 1527B voltage tester between terminal 1 (B+) and 2 (signal).
      5.  
    5. Crank the engine over for several seconds.
      6.  
    6. The voltage tester must flash briefly for every second engine rotation.
      7.  

    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.  
    2. 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.
      3.  
    3. 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.
      4.  
    4. If the wiring is OK, connect a DMM between test box socket B2 and a vehicle ground.
      5.  
    5. Turn the ignition switch to "ON". There should be a minimum of 4.0 volts.
      6.  
    6. If the specified value is not obtained, replace the ECM.
      7.  
    7. If the specified value is obtained, replace the Camshaft Position (CMP) sensor.
      8.  

    Audi A4 2.7L

    NOTE
    The Camshaft Position (CMP) sensor is located at the rear of the left hand cylinder head (Bank 2). The Camshaft Position (CMP) sensor 2 is located at the front of the right hand cylinder head (Bank 1).

    CMP SENSOR FUNCTIONAL TEST


    NOTE
    Use test leads VAG1594 connector test kit when carrying out the following tests.

    1. Push back rubber grommet on the camshaft sensor connector.
      2.  
    2. Connect VAG1527 diode test lamp to terminals 1 and 2 of the camshaft sensor connector from behind (without disconnecting connector from the sensor).
      3.  


    NOTE
    The connector terminals are numbered on the back of the connector.

    1. Crank the engine over for a few seconds, the diode test lamp should blink briefly once every 2 engine revolutions.
      2.  


    NOTE
    Diode test lamps with a low current draw continue to glow faintly between impulses from the ECM (rather than going out completely) and become much brighter when receiving an impulse.

    1. If the diode test lamp does not flash, test the voltage supply.
      2.  
    2. Disconnect the harness connector from the relevant camshaft sensor.
      3.  
    3. Switch the ignition to "ON".
      4.  
    4. Connect a DMM, using voltage measurement range, between engine ground and socket 1 of the connector. There should be approximately 5 volts.
      5.  

    CHECKING SIGNAL WIRE FOR CAMSHAFT SENSOR
    1. Connect the DMM, using voltage measurement range, between engine ground and socket 2 of the relevant CMP sensor connector. There should be approximately battery voltage.
      2.  

    CHECKING CMP SENSOR GROUND (GND) WIRE
    1. Connect a VAG1598/31 test box to the wiring harness for the ECM.
      2.  


    NOTE
    Do NOT connect to the ECM itself.

    1. Connect a DMM, using resistance measurement range, between socket 3 on the connector and the engine ground (GND). The DMM should show a maximum resistance of 1.5 ohms.
      2.  
    2. If all specifications are reached, but the diode test lamp does not flash (measurement taken between terminals 1 and 2 without unplugging connector and while operating starter), replace the relevant CMP sensor.
      3.  
    3. If specifications are obtained, check wiring.
      4.  

    CHECKING WIRING BETWEEN CAMSHAFT SENSOR & ECM
    1. Connect a VAG1598/31 test box to the wiring harness for the ECM.
      2.  


    NOTE
    Do NOT connect directly to the ECM itself.

    1. Check the wiring connection from the camshaft position sensor to the ECM for open circuit and/or short circuit to B+ or ground (GND). There should be a maximum resistance of 1.5 ohms.
      2.  
    2. Repair any open or short in wiring as necessary.
      3.  



    Click image to see an enlarged view

    Fig. Showing the position of the test connectors

    REMOVAL & INSTALLATION
    1.8L Engines


    Click image to see an enlarged view

    Fig. Showing the 1.8L engine camshaft position sensor

    1. Disconnect the electrical connector for the sensor.
      2.  
    2. Remove the timing belt upper cover.
      3.  
    3. Remove the housing for the sensor.
      4.  

    2.7L & 2.8L


    Click image to see an enlarged view

    Fig. Here is the CMP sensor used on the 2.7L & 2.8L engines

    Key list for gnam 93224vwg56:

    13-CMP sensor, cylinder bank 2

    17-Harness connector

    18-CMP sensor, cylinder bank 1

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