11 61 730 Check BMW diagnosis system for excess pressure and vacuum (N63).

Important!  

Excess pressure and vacuum lines are identified by the size of the connection fittings and colour-coded red and blue and must not be mixed up with each other. Build up pressure with Blue color. Generate vacuum pressure with Red color. Mixing up the functions will result in damage to the engine.

Necessary preliminary tasks:  

• Release upper section of intake air filter
• Prepare BMW diagnosis system.
• Start diagnosis program.
  1. Electric motor
  2. Engine electronics
  3. Air supply
  4. Charging pressure control

or Perception

Lack of power

Note on ordering:

• Workshop equipment.
• Workshop planning.
• Workshop equipment catalogue.
• Measuring and test equipment.
• No. 81 29 0 426 464

Pressure measurement:  

Prepare BMW diagnosis system on diagnosis unit.

1. Screw in pressure sensor.
2. Overpressure connection (Blue).
3. Connect stimuli cables (3) to positive and negative.
4. Connect 12V battery cables (4) to vehicle battery positive and negative.
   Fig 1: Identifying Pressure Measurement

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Secure seal plug (1) with union nut (2) in intake duct and seal.

Note:  

Twin-Turbo: both intake ducts must be sealed.

Fig 2: Securing Seal Plug With Union Nut

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Insert Blue pneumatic hose (4) in pneumatic coupling (2) of sealing plug (1).

Seal plug (3) has no pneumatic coupling.

Fig 3: Inserting Blue Pneumatic Hose In Pneumatic Coupling

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Vacuum pressure measurement:  

Prepare diagnosis tester on diagnosis unit.

1. Screw in pressure sensor.
2. Connect stimuli cables (2) to positive and negative.
3. Connect 12V battery cables (3) to vehicle battery positive and negative.
4. Controller for vacuum connection.
5. Vacuum connection (Red).
   Fig 4: Identifying Vacuum Pressure Measurement

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Calibration for vacuum pressure measurement:  

Seal stop cock (2) in direction of arrow.

Release lock nut on controller (1).

Carry out pressure adjustment in accordance with BMW diagnosis instruction.

Secure controller (1) hand-tight against turning.

Open stop cock (2) again.

Fig 5: Performing Calibration For Vacuum Pressure Measurement

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Connections on EPPC: 

1. Connection (VAC) to vacuum reservoir.
2. Connection (OUT) with ring to exhaust turbocharger.
   Fig 6: Identifying Connection (VAC) And Connection (OUT)

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Vacuum activation, cylinders 1-4. 

Detach red vacuum hose from vacuum unit.

Prepare T-piece (5) with vacuum lines for measurement.

Connect red vacuum line (1) with vacuum unit (2) and quick-release coupling (3).

Open shutoff tap (4).

Note:  

Observe diagnosis instructions.

Fig 7: Identifying Vacuum Activation, Cylinders 1-4

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Vacuum activation, cylinders 5-8.  

Detach blue vacuum hose from vacuum unit.

Prepare T-piece (5) with vacuum lines for measurement.

Connect blue vacuum line (1) with vacuum unit (2) and quick-release coupling (3).

Open shutoff tap (4).

Note:  

Observe diagnosis instructions.

Fig 8: Identifying Vacuum Activation, Cylinders 5-8

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Exhaust turbocharger, cylinders 1-4. 

Initial position (1) of wastegate linkage depressurized.

Wastegate valve opened.

Fig 9: Identifying Exhaust Turbocharger, Cylinders 1-4

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Initial position (1) of wastegate linkage with vacuum pressure.

Wastegate valve closed.

Fig 10: Identifying Initial Position Of Wastegate Linkage With Vacuum Pressure

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Exhaust turbocharger, cylinders 5-8.  

Initial position (1) of wastegate linkage depressurized.

Wastegate valve opened.

Fig 11: Identifying Initial Position Of Wastegate Linkage Depressurized

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Initial position (1) of wastegate linkage with vacuum pressure.

Wastegate valve closed.

Fig 12: Identifying Initial Position Of Wastegate Linkage With Vacuum Pressure

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Check wastegate valve with vacuum:  

Wastegate valves must be opened without vacuum.

The wastegate valves must close if a vacuum pressure is applied at the wastegate sockets (see BMW diagnosis system).

Check shaft on turbine wheel for rotatability.

Fig 13: Identifying Wastegate Components

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