2.2 Checking charge pressure control
Special tools and workshop equipment required
◆ Hand vacuum pump with accessories -V.A.G 1390-
Test prerequisites
● Engine running at idling speed
● Fuses must be OK.
● The battery voltage must be at least 11.5 V.
● All electrical consumers must be switched off.
● Earth connections OK
● No leaks on intake and exhaust systems
● No faults on engine and fuel injection system or related to
compression.
● No faults must be stored in event memory ⇒ Page 26, read
event memory.
● Coolant temperature must be at least 80°C, ⇒ display group
1, display zone 4.
Test procedure
– Carry out final control diagnosis, and activate charge pres-
sure control solenoid valve -N75- ⇒ Page 89, final control di-
agnosis.
The displays in display zones 2, 3 and 4 must fluctuate within
following control range:
Display zone 2 OFF:
● Specification in display zone 3: 900…1150 mbar
● Specification in display zone 4: 90…100%
Display zone 2 ON:
● Specification in display zone 3: 100 mbar higher than with
display OFF
● Specification in display zone 4: 95%
Note
◆ If the engine is idling or OFF, the activation of the valve can
also be checked by touching it.
◆ During activation with the engine idling, the linkage of the
charge pressure control vacuum unit on the turbocharger
must move back and forth.
If the valve is not activated:
– Proceed with final control diagnosis until completed.
Note
If the engine is idling or OFF, the activation of the valve can also
be checked by touching it.
– Proceed with final control diagnosis until completed.
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
3
2 Checking charge air system
333
To Next Page
Loading...
