Volkswagen CJDA Workshop Manual page 65

Indicated on display
Short to earth
01024/P0400
Exhaust gas recirculation
system
Malfunction
01025/P0401
Exhaust gas recirculation
system
Insufficient throughput
01026/P0402
Exhaust gas recirculation
system
Excessive throughput
01027/P0403
Exhaust gas recirculation
valve -N18-
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
Possible cause of fault Possible effects
◆ Wire open circuit or
wire has short to
earth
◆ Automatic glow peri-
od control unit -J179-
defective
◆ Exhaust gas recircu-
lation system defec-
tive
◆ Exhaust gas recircu-
lation system clogged
◆ Leak in exhaust gas
recirculation system
◆ Leak in exhaust gas
recirculation system
Industriemotoren - Industrial Engines 2009 ▶
◆ Glow plug control
module is switched off
◆ Entire glow plug sys-
tem does not work.
◆ Possible bad cold
start behaviour of en-
gine
◆ Possible smoke when
starting engine
◆ No exhaust gas recir-
culation
◆ Reduced performance
◆ Increased exhaust
emissions
◆ EGR is switched off
◆ No regeneration
◆ EGR is switched off
◆ No regeneration
3
Fault remedy
– Check -J179-
⇒ P age
89, final
control diagnosis
– Electr. test of pilot line
ECU<>glow period
control unit, connector
– Check exhaust gas re-
circulation system
⇒ P age 436
– Check exhaust gas re-
circulation system
⇒ P age 436
– Check operation of
exhaust gas recircula-
tion valve
– Check air duct system
for leaks
– Check exhaust gas re-
circulation system
⇒ P age 436
– Check operation of
exhaust gas recircula-
tion valve
– Check air duct system
for leaks
3 List of fault codes 49