Checking the internal engine pressure
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 .