11 61 730 BMW leak test for intake system

Necessary preliminary tasks: 

• Release upper section of intake air filter.
• Prepare BMW diagnosis system.
• Start diagnosis program.

1. Drive
2. Engine electronics
3. 3 Air supply
4. Boost pressure control

or Perception

Lack of power

Note on ordering:

• Workshop equipment.
• Workshop planning.
• Workshop equipment catalogue.
• Measuring and test equipment.

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 12 V battery cables (4) to vehicle battery positive and negative.
   Fig 1: Installing BMW Diagnosis System On Diagnosis Unit

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

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 12 V 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: Measuring Calibration For Vacuum Pressure

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Connections on EPPC: 

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

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Checking wastegate on cylinders 1-3: 

Detach vacuum line from EPPC (2), cylinders 1-3 (OUT).

Disconnect connecting line with suitable tool (1).

Attach vacuum line to pneumatic coupling (3) with Red pneumatic hose in direction of arrow.

Fig 7: Detaching Vacuum Line From EPPC, Cylinders 1-3 (Out)

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Checking wastegate on cylinders 4-6: 

Detach vacuum line from EPPC (2), cylinders 4-6 (OUT).

Disconnect connecting line with suitable tool (1).

Attach vacuum line to pneumatic coupling (3) with Red pneumatic hose in direction of arrow.

Fig 8: Detaching Vacuum Line From EPPC, Cylinders 4-6 (Out)

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Initial position (1) of wastegate linkage depressurized.

Wastegate valve opened.

Fig 9: Positioning Of Wastegate Linkage Depressurized

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

Wastegate valve closed.

Fig 10: Initial Position Of Wastegate Linkage With Vacuum Pressure

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Checking wastegate valve (1) with vacuum pressure: 

Wastegate valve must be opened without vacuum pressure.

The wastegate valves must close if a vacuum pressure is applied at the wastegate sockets .

Check shaft on turbine wheel for rotatability.

Fig 11: Identifying Wastegate Valve

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Checking pop-off valves: 

Necessary preliminary tasks: 

• Remove both pop-off valves

Connect vacuum hose (3).

Establish vacuum pressure at 500 mbar.

Plunger (1) must visibly release the opening in the direction of the arrow as far as it will go.

Fig 12: Identifying Pop-Off Valve And Vacuum Hose

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Assemble engine.

Observe diagnosis instructions.