B110308 Service Bulletin/Repair Instructions

TIS Service Bulletin
SI B11 03 08

Engine
Page 1 of 3
July 2018

Technical Service
CRANKCASE VENTILATION SYSTEM DIAGNOSIS AND

MEASUREMENT

New information provided by this revision is preceded by this symbol
.
This Service Information bulletin replaces SI B11 03 08 dated July 2017

What’s New:

• BXX engine specifications diagnostic tips updated

• Basic diagnostic tips updated
MODEL

All
INFORMATION

All current BMW engines incorporate a pressure-controlled crankcase ventilation system. The crankcase

ventilation systems use various different crankcase ventilation valves, depending on the engine type. Although

the valves all look different, they function similarly, using a spring and diaphragm assembly to control the

crankcase pressure. A properly functioning pressure control valve is designed to maintain a slight vacuum

(under-pressure) in the crankcase, which assures reliable crankcase venting during all engine operating

conditions. Some of the causes and results of a malfunctioning crankcase ventilation system are listed below.

Causes of Excessive Overpressure (Pressure)


Internal engine damage/wear

Obstruction in the crankcase ventilation system

Defective pressure control valve(s)

Cylinder head cover wastegate vacuum reservoir leakage. The vacuum reservoir can also be

filled with engine oil indicating an internal leak.
Results of Excessive Overpressure


Damage to the engine oil seals

Increased engine oil consumption (can be misdiagnosed as a defective turbocharger)

Excessive engine oil in the intake system


Excessive engine oil in the charged intake tubes or the intercooler on turbocharged engines (can be

misdiagnosed as a defective turbocharger)

Engine oil dip stick is dislodged from the guide tube (if equipped)

Cause of Excessive Under-pressure (Vacuum)
https://www.bmwtis.net/tiscode/cgi-bin/bulletin.aspx?sie_path=/tsb/bulletins/htm_store/468... 8/1/2018
TIS Service Bulletin

Defective pressure control valve

Defective vacuum pump

Page 2 of 3
Cylinder head cover wastegate vacuum reservoir leakage. The vacuum reservoir can also be

filled with engine oil indicating an internal leak.
Results of Excessive Under-pressure


Damage to the engine oil seals

Increased engine oil consumption

Excessive engine oil in the intake system

Rough engine idling or engine misfire

Whistling or howling noise from the engine (can be misdiagnosed as a defective turbocharger)

Increased mixture adaptation values
N63R, N63, N63T, N74, S63 and S63T Equipped Vehicles

The crankcase ventilation system utilized in these engines cannot be measured with consistency because the

system does not incorporate a regulating valve (spring with diaphragm). The crankcase pressure is regulated by

an orifice in the crankcase ventilation tubes, and the vacuum will vary with crankcase pressure changes.

Checking the operation of this unregulated system can only be performed by visually inspecting for loose

connections or cranks in the system components. Generally active leakages will have an oily residue

surrounding that affected area. The use of a smoke machine may also be helpful when trying to locate leakages

in this system.

BXX Engines Only:

Depending on the customers driving profile, the crankcase ventilation pressure can vary when measured due to

a normal shift in the Variable Valve Lift (VVT) adaptations.

If the VVT adaptations are cleared or the vehicle has been programmed recently then the crankcase pressure

will also be adjusted because the adaptations in general have been cleared. Over time, the crankcase pressure

will change as the vehicle re-adapts to the customer driving profile. This is a not failure when the crankcase

pressure is found at the minimum or maximum limits. Do not clear any adaptations or program the vehicle for

this reason.

Attached to this Service Information bulletin is a procedure for measuring the crankcase ventilation system,

using the ISID and IMIB diagnostic equipment.
Engine Variant
Specification (mBar)

Min - Max
B38T & XB2H
15.0 - 25.0
B46
15.0 - 27.0
B48 & XB1H
15.0 - 29.0
B58
20.0 - 52.0
All Other Engines
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TIS Service Bulletin
Page 3 of 3
Specification and actual readings from the vehicle may vary by up to ±10%, but not more than 5.0 mBar.

Various measuring tools may provide results that are not within specification. All measurements below were

recorded using the IMIB. See the attachment for IMIB connection hints.

Attached to this Service Information bulletin is a procedure for measuring the crankcase ventilation system,

using the ISID and IMIB diagnostic equipment
Engine Variant
Specification (mBar)
M42, M44, M52, M52TU, S52, M54, M60, M62, M62TU, M73
16.0
M57Y
0.0 +- 1.0
S54
0.0 +- 1.0
S62
0.0 +- 1.0
S65
0.0 +- 2.0
S85
0.0 +- 1.0
S55
49.0
N47T
0.0 +- 3.0
N57T
0.0 +- 3.0
N20 and N26
35.0
N52
30.0
N51 and N52K
33.0
N52T
21.0
N54
17.0
N54T
14.0
N55
50.0 +/- 8.0
N62
22.0
N62TU
40.0
N73
30.0
WARRANTY INFORMATION

Not applicable.

Posted: Tuesday, July 17, 2018
ATTACHMENTS

View PDF attachment B110308_Attachment.

[ Copyright ©2018 BMW of North America, Inc. ]
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Attachment to SI B11 03 08
October 2013
Measuring Crankcase Pressure Using the IMIB Low-pressure Sensor Function

Preparing ISID and IMIB for Low-pressure Measurement:

1. Select “Activities”.

2. Select “Measuring Devices”.

3. Select “Measuring Device”.

4. Select “OK”.

5. Select the appropriate IMIB when the Connection Manager screen is shown.

6. Select “Set Up Connection”.

7. When the multimeter screen is shown, select “Low Pressure 1”.

8. Connect the pressure measurement hose, P/N A5E0134072, to the left port on the IMIB (1). Two

measurement hoses were shipped with the IMIB to every center. See the illustration below. Refer to SI

B04 35 09 for more information regarding the equipment shipped to all centers with the IMIB.

Port 1 = (1)

Port 2 = (2)
Attachment to SI B11 03 08
October 2013
9. Low pressure 1 (1) should be highlighted in green. Observe and record the current ambient pressure

(2).

Note: The illustration is only an example of what will be seen on the screen. This is based on

center elevation and weather patterns. This value must be recorded each time the pressure test

is conducted.
Attachment to SI B11 03 08
October 2013
Diagnostic Tool Adapter P/N 81 29 2 158 850.

The adapter will be used to adapt the 2G quick

disconnect equipment during low-pressure

measurements (up to 3 bar; see the user’s guide),

and is attached to the IMIB using the low-pressure

rubber hose (Siemens P/N A5E01034072), supplied

with the IMIB. For additional information, refer to

Service Information B04 15 10.
Attachment to SI B11 03 08
October 2013
Option 1:

Remove the quick disconnect coupler (1) from the

2G equipment 25 bar pressure transducer (2).
Install the Diagnostic Tool Adapter, P/N 81 29 2 158

850 (1), on to the quick disconnect coupler (2).
Remove the engine oil cap and install the special

pressure tester adapter, P/N 83 30 0 496 326 (1).

Connect the quick disconnect coupler (2) onto the

pressure tester adaptor. Connect the IMIB pressure

measurement hose, P/N A5E0134072 (3).

Refer to the table located on SIB 11 08 03 for

specifications.
Attachment to SI B11 03 08
October 2013
Alternative Measurement/Connection Solution

Remove the oil cap adaptor from the existing Slack

Tube Manometer.
Remove the engine oil cap and install the oil cap

adapter (1). Connect the IMIB pressure

measurement hose, P/N A5E0134072 (2).

Refer to the table located on SIB 11 08 03 for

specifications.

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