Volkswagen CJDA Workshop Manual page 82

3
Industriemotoren - Industrial Engines 2009 ▶
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
Indicated on display
Electrical fault in current
circuit
05121/P1401
Exhaust gas recirculation
valve
Short to earth
05122/P1402
Exhaust gas recirculation
valve
Short to positive
05184/P1440
Exhaust gas recirculation
valve
66 Repair Group 01 - Vehicle self-diagnosis
Possible cause of fault Possible effects
◆ Open circuit or line
short-circuit
◆ -N18- defective
◆ Wire open circuit or
wire has short to
earth
◆ -N18- defective
◆ Open circuit or short
to positive in wire
◆ -N18- defective
◆ No regeneration of
diesel particulate filter
◆ H bridge deactivated -
no EGR
◆ No limitation
◆ No exhaust gas recir-
culation
◆ H bridge deactivated
◆ No regeneration of
diesel particulate filter
◆ No limitation
◆ No exhaust gas recir-
culation
◆ H bridge deactivated
◆ No regeneration of
diesel particulate filter
◆ No limitation
Fault remedy
– Check -N18-
⇒ P age
89, final
control diagnosis
– Check wiring of DC
motor/EGR valve
(short-circuit between
M+ and M-)
– Disconnect EGR valve
--> clear event memo-
ry, fault stored again
== ECU defective -->
no new fault == actua-
tor defective
– Check -N18-
⇒ P age
89, final
control diagnosis
– Check wiring of DC
motor/EGR valve
(short-circuit between
M+ and M-)
– Disconnect EGR valve
--> clear event memo-
ry, fault stored again
== ECU defective -->
no new fault == actua-
tor defective
– Check -N18-
⇒ P age
89, final
control diagnosis
– Check wiring of DC
motor/EGR valve
(short-circuit between
M+ and M-)
– Disconnect EGR valve
--> clear event memo-
ry, fault stored again
== ECU defective -->
no new fault == actua-
tor defective