MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
108
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Checking Item and Position
Cause
Troubleshooting
should be on for at least 14 s,
otherwise the quick start-up
timer may be damaged.
(2) Set the starting switch from
―OFF‖ to ―ON‖ and the glow plug
relay should be on for at least 14
s, otherwise the quick start-up
timer may be damaged.
(2) Replace the quick start-up
timer.
Temperature switch
Damaged temperature switch
Replace the temperature switch.
Glow plug connection
Disconnection of the glow plug
Check the glow plug connecting
harness and replace the glow
plug.
Glow plug not energized
The glow plug indicator lamp is
off.
Blowout
of
the
glow
plug
indicator lamp fuse
Replace the glow plug indicator
lamp fuse.
Quick start-up timer
Damaged quick start-up timer
Replace the quick start-up timer.
The glow plug indicator lamp is
on for 3.5 s.
(1) The glow plug relay is
damaged. The glow plug relay is
not connected after the starting
switch is set from ―OFF‖ to ―ON‖.
(2) Damaged glow plug relay
wire
(3) The fuse or circuit wire is
broken. The glow plug relay is
not connected after the start
switch is set from ―OFF‖ to ―ON‖.
(1) Replace the glow plug.
(2) Repair or replace the glow
plug relay circuit wire.
(3) Replace the fuse or wire.
18. No Power Generation, Undercharge or Overhigh Charging Current of Generator
Phenomenon and Cause of Malfunction
Troubleshooting
No power
generation
(1) Improper wiring, broken wiring or poor
contact of wiring
(2) Open circuit of rotor coil
(3) Damaged rectifier diode
(4) Poor contact of carbon brush
(5) Damaged regulator
(1) Repair the circuit.
(2) Repair or replace the generator
assembly.
(3) Replace the diode.
(4) Clear the dirt or replace the carbon
brush.
(5) Repair or replace the regulator.
Undercharge of
generator
(1) Poor contact of carbon brush or oil
pollution on the slip ring
(2) Damaged regulator
(1) Adjust the carbon brush and clean
the slip ring.
(2) Replace the regulator.
