Indicated on display
Possible cause of fault Possible effects
Fault remedy
Signal too large
◆
Wire open circuit or
wire has short to
earth
◆
-G212- defective
◆
Particulate filter re-
generation locked
– Check -G212-
exhaust gas recircula-
tion valve -N18-
– Check exhaust gas re-
circulation system
– Check whether con-
nector on exhaust gas
recirculation valve is
OK
– On wiring harness:
check feedback line
for short-circuit to bat-
tery voltage and to
5V supply
voltage. Check feed-
back line for open
load.
– On exhaust gas recir-
culation valve: check
for short-circuit be-
tween 5V
supply voltage and
feedback line on ex-
haust gas recirculation
valve
01056/P0420
Catalytic converter sys-
tem, bank 1
Industriemotoren - Industrial Engines 2009
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Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
3
3 List of fault codes
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