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 color-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:

• applicable BMW Workshop Equipment.
• Workshop planning.
• applicable BMW 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: Measuring Pressure

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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: Identifying Seal Plug And 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 Of Sealing Plug

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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: Measuring Vacuum Pressure

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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: Releasing Lock Nut On Controller

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Connections on EPPC: 

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

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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 Line

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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 Pipe Connections

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Exhaust turbocharger, cylinders 1-4. 

Initial position (1) of wastegate linkage depressurised. Wastegate valve opened.

Fig 9: Identifying Turbocharger Control Link

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

Fig 10: Locating Turbocharger Control Link End

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Exhaust turbocharger, cylinders 5-8. 

Initial position (1) of wastegate linkage depressurised. Wastegate valve opened.

Fig 11: Identifying Turbocharger Control Link

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

Fig 12: Locating Turbocharger Control Link End

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Check wastegate valve with vacuum: 

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 Turbocharger Pipe Components

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