Component Tests and General Diagnostics

11 61 730 - BMW leak test for intake system (N54)





Important!
Pressure and vacuum lines can be recognized by the size of their fasteners and are color-coded blue and red respectively.
Designation:
- Pressure line blue
- Vacuum line red
Pressure and vacuum lines must not be mixed up.
Mixing up the lines will result in engine damage.





Necessary preliminary tasks:
- Remove upper section of intake filter housing Service and Repair
- Prepare BMW diagnosis system
- Start diagnosis program
1. - Drive
2. - Engine electronics
3. - Air supply
4. - Boost pressure control system or perception of lack of power
Ordering note:

- Workshop Equipment - Start BMW
- Workshop equipment catalogue
- Measuring and test equipment
- Service and diagnosis
- Order number 81 29 0 426 464





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).





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.





Connections on EPPC:
- "VAC" connection (1) to vacuum reservoir
- "OUT" connection (2) to exhaust turbocharger





Checking wastegate on cylinders 1-3:
Detach vacuum line (1) from EPPC (2), cylinders 1-3 (OUT).
Clamp off connecting line with suitable tool (1).
Attach vacuum line to pneumatic coupling with Red pneumatic hose in direction of arrow.





Checking wastegate on cylinders 4-6:
Detach vacuum line (1) from EPPC (2), cylinders 4-6 (OUT).
Clamp off connecting line with suitable tool (1).
Attach vacuum line to pneumatic coupling with Red pneumatic hose in direction of arrow.





Initial position (1) of wastegate linkage depressurized.
Flap of vacuum unit (wastegate valve) is open.





Initial position (1) of wastegate linkage with vacuum pressure.
Flap of vacuum unit (wastegate valve) is closed.





Checking flap of vacuum unit (wastegate valve):
Flap (1) of vacuum unit (wastegate valve) must be open in depressurized state.
Flap (1) of vacuum unit (wastegate valve) must be closed in event of vacuum pressure.
Check shaft on turbine wheel for rotatability.





Pressure measurement:
Prepare BMW diagnosis system on BMW auxiliary diagnosis unit - pressure.
1. - Screw in pressure sensor (1).
2. - Insert blue pressure line (2) as far as it will go into pneumatic coupling.
3. - Connect stimulus leads (3) to positive and negative terminals.
4. - Connect 12V battery cables (4) to vehicle battery positive and negative.

Note:
Pneumatic coupling locks automatically.





Note:
For an exact leak test, seal clean-air pipe (1) with special tool (3) bearing number 82 29 2 146 625.

Secure clamp (2) to 4 Nm.

Secure union nut (4) to 10 Nm.





Insert blue pressure line (3) as far as it will go into pneumatic coupling (2).

Note on removal:
Slide lock (1) of pneumatic coupling (2) in direction of arrow.
Release blue pressure line (3).





Checking pop-off valves:

Necessary preliminary tasks:
- Remove both pop-off valves 11 65 164 Removing and Installing/Replacing Both Blow-Off Valves

Note:
To check the function of the pop-off valves (2), it is necessary to build up vacuum pressure at the valves.
Establish vacuum pressure with the BMW auxiliary diagnosis unit - vacuum.

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.

Important!
Plunger (1) must maintain this position while vacuum pressure is being created.
If this is not the case, replace the pop-off valve (2).

Checking activation of pop-off valves with EPPC:

Observe BMW diagnosis instructions.
Check all vacuum lines for damage and firm seating.





Connections on EPPC:
- "VAC" connection (1) to vacuum reservoir
- "OUT" connection (2) to pop-off valve





Observe BMW diagnosis instructions.