Procedure
– Connect vehicle diagnostic tester, and select engine control
unit.
– Select diagnosis function “03-Final control diagnosis”. En-
gine must be idling.
Activating exhaust gas recirculation valve -N18-
Note
After the diagnosis function “03-Final control diagnosis” has
been selected, the first final control, here the exhaust gas recir-
culation valve -N18-, is activated.
The exhaust gas recirculation valve -N18- is activated.
The displays in display zones 3 and 4 must fluctuate within fol-
lowing control range:
● Specification in display zone 3: 180…470 mg/stroke
● Specification in display zone 4: 70…100%
Note
The activation of the valve can also be checked by touching it.
If the valve is not activated:
– Proceed with final control diagnosis until completed.
– Check exhaust gas recirculation
Activating charge pressure control solenoid valve -N75-
– Press
→
button.
The charge pressure control solenoid valve -N75- is activated.
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
◆
The activation of the valve can also be checked by touching
it.
◆
During activation, 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.
– Check the charge pressure control
3
Industriemotoren - Industrial Engines 2009
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Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
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Repair Group 01 - Vehicle self-diagnosis