◆
Current flow diagram
Test prerequisites
● Fuses must be OK.
● The battery voltage must be at least 11.5 V.
● All electrical consumers must be switched off.
● Earth connections OK
● Coolant temperature must be at least 80°C,
⇒
display group
1, display zone 4.
Test procedure
Note
◆
The exhaust gas recirculation valve -N18- and exhaust gas
recirculation potentiometer -G212- are installed in one com-
mon housing.
◆
Only gold-plated contacts may be used when repairing the
contacts in the connector of the exhaust gas recirculation
valve.
– Connect vehicle diagnostic tester, and select engine control
unit.
– Select diagnosis function “015-Access permissions”.
– Carry out final control diagnosis, and activate exhaust gas
recirculation valve -N18-
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.
– Proceed with final control diagnosis until completed.
– Exit diagnosis function.
– Switch off ignition.
If the valve is not activated:
– Pull off 6-pin connector on exhaust gas recirculation valve
-N18- with exhaust gas recirculation potentiometer -G212-
-3-
Checking voltage supply
– Switch on ignition.
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 26 - Exhaust system
