Volkswagen CJDA Workshop Manual page 79

Indicated on display
Implausible signal
01674/P068A
Main relay
Opens too early
01675/P068B
Main relay
Opens too late
01687/P0697
Sender reference voltage
"C"
Open circuit
Workshop Manual for Diesel Engine (2.0 l/36-75 kW_EA 189) 05.2015
Possible cause of fault Possible effects
◆ Open circuit or line
short-circuit
◆ Automatic glow peri-
od control unit -J179-
defective
◆ Open circuit or line
short-circuit
◆ Defective terminal 30
voltage supply relay
-J317-
◆ Open circuit or line
short-circuit
◆ Defective terminal 30
voltage supply relay
-J317-
◆ Open circuit or line
short-circuit
Industriemotoren - Industrial Engines 2009 ▶
◆ Entire glow plug sys-
tem does not work
◆ Engine does not start
or is difficult to start
when cold
◆ Possible smoke when
starting engine
◆ Engine stops
◆ Engine control unit
switched off
◆ Battery may be dis-
charged, because
ECU is not switched
off
◆ Faults for sensors
connected to this
source are locked.
◆ Worst case - engine
stops
3
Fault remedy
– Check -J179-
⇒ P age
89, final
control diagnosis
– Check wiring to auto-
matic glow period con-
trol unit -J179-
⇒ P age
486, current
flow diagrams
– Check terminal 30
fuse for glow plug
main circuit.
– Disconnect glow peri-
od control unit, and
measure voltage on
pin
– Check voltage on
wire.
– Check wires to -J317-
⇒ P age
486, current
flow diagrams
– Renew main relay, if
necessary
– Check wires to -J317-
⇒ P age
486, current
flow diagrams
– Renew main relay, if
necessary
– Renewing engine con-
trol unit -J623-
⇒ P age 418
3 List of fault codes 63