Checking the internal engine pressure
WARNING: This page is about a different car, the 2022 BMW X7, 2021 BMW X7, 2020 BMW X7, and 2019 BMW X7. However, it is still accessible from the selected car via links, so may be relevant.
Preliminary work
- Refer to CHECKING ENGINE OIL LEVEL .
- Refer to REMOVING THE OIL FILLER CAP .
NOTE:
Schematic diagram is for example purposes. Some parts may differ in certain details.
- Have the special tool 2 471 014
ready.
- Insert the special tool 2 471 014 into the opening of the oil filler neck and screw it in hand-tight.
- Connect connection hose (1) to the special tool.
Testing equipment
Connecting hose
dia. = 8 x 13 mm, length = 70 mm
- low pressure line
low pressure line
IMIB R2 low pressure line
81 31 2 357 800
300
mm
Connect with the connection hose (1).
- low pressure line
low pressure line
IMIB R2 low pressure line
81 31 2 357 800
300
mm
(1) Connect with the Integrated Measurement Interface Box (IMIB).
- Start engine and run at idle speed.
Check
- Check the internal engine pressure with the Integrated Measurement Interface Box (IMIB).
- Connect the diagnostic system and follow the diagnosis instructions for the pressure test.
- Troubleshooting
- Function structure
- Power train
- Engine electronics
- Crankcase ventilation
Result
» There is a deviation between the measured value and the ambient pressure.
Measure
- Determine possible causes by means of the table and eliminate them.
Deviation Possible cause Measures Result 1 Measured value < ambient pressure 0.95 bar Pressure control valve faulty Replace the pressure control valve Result 2 Measured value > ambient pressure 0.95 bar Crankcase ventilation system blocked Clean the crankcase ventilation system
Follow-up work
- Refer to OPENING THE OIL FILLER CAP .