Volkswagen CJDA Workshop Manual page 66

3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
Indicated on display
Malfunction
01029/P0405
Exhaust gas recirculation
sender
Signal too low
01030/P0406
Exhaust gas recirculation
sender
50 Repair Group 01 - Vehicle self-diagnosis
Possible cause of fault Possible effects
◆ -N18- defective
◆ Wiring open circuit or
wiring short to posi-
tive
◆ -G212- defective
◆ Glow period warning
lamp -K29- lights up
◆ Exhaust emissions
warning lamp -K83-
lights up
◆ Position controller de-
activated
◆ Offset cannot be
learnt anymore
◆ No particulate filter re-
generation possible
anymore
◆ Particulate filter re-
generation locked
Fault remedy
– Check -N18-
⇒ P age
89, final
control diagnosis
– Check exhaust gas re-
circulation system
⇒ P age 436
– If difference between
"EGRVlvR" and
"EGRVlvRAct" is high-
er than +/-15%, renew
valve.
– If difference is smaller
⇒ check activation
wiring (M+ and M-) for
loose contacts.
– Sensor voltage supply
and signal line are to
excluded
– Check -G212-
⇒ P age
437, check
exhaust gas recircula-
tion valve -N18-
– Check exhaust gas re-
circulation system
⇒ P age 436
– Check whether con-
nector on exhaust gas
recirculation valve is
OK
– On wiring harness:
check feedback line
for short-circuit to sen-
sor earth and to body
earth.
– On exhaust gas recir-
culation valve: check
for short-circuit be-
tween pins for sensor
earth and feedback
line on exhaust gas
recirculation valve