Volkswagen CJDA Workshop Manual page 68

3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
Indicated on display
Low performance
01132/P046C
Exhaust gas recirculation
potentiometer
Implausible signal
01281/P0501
Vehicle speed signal
52 Repair Group 01 - Vehicle self-diagnosis
Possible cause of fault Possible effects
◆ Diesel oxidising cata-
lytic converter clog-
ged with sulphur
● Open circuit or line
short-circuit
● -G212- defective
◆ Difference between
exhaust gas tempera-
ture ahead of turbine
and downstream from
diesel oxidising cata-
lytic converter too low
during regeneration
◆ None
Fault remedy
– Check -G212-
⇒ P age
437, check
exhaust gas recircula-
tion valve -N18-
– Check exhaust gas re-
circulation system
⇒ P age 436
◆ On 1st occurrence,
repeat service regen-
eration
◆ On repeated occur-
rence, note the fol-
lowing:
– Check temperature
sensors ahead of tur-
bine and downstream
from diesel oxidising
catalytic converter for
plausibility
– If OK, check air mass
meter for plausibility
– If OK, check exhaust
system for leaks
– If OK, check injection
system
– If OK, check whether
high-pressure exhaust
gas recirculation valve
is stuck on open posi-
tion or whether throttle
valve is jammed
– If OK, renew oxidising
catalytic converter
– Clean valve, renew as
necessary