Chapter III Malfunction Diagnosis and Troubleshooting
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
107
Fuel (motor diesel)
(1) Applied inappropriate fuel
(2) Water in the fuel system
(1) Choose the qualified fuel according
to the ambient temperature.
(2) Drain out the water in the fuel
system or replace the fuel.
Low voltage of the
storage battery
(1) Looseness of the storage battery
wiring, corrosion of the terminal
(2) Storage battery inadequately
charged
(1) Clean the storage battery terminal
and fasten the wiring.
(2) Charge the storage battery.
Low pressure of the
high pressure oil
circuit
Bad control of the high pressure fuel
pump and high pressure fuel rail
pressure.
Check the high pressure fuel pump or
the high pressure fuel rail pressure
control system.
Bad performance of
the fuel injector
Damage of the fuel injector nozzle; bad
performance of the electromagnetic
valve
Check the fuel injector or replace it;
when it is replaced, it is required to
input the new injector code into the
ECU.
Coolant temperature
sensor (winter)
Wrong information for the coolant
temperature in winter; glow plug not
working
Replace the coolant temperature
sensor.
17. Difficulty in Starting Due to Malfunction in the Quick Start-up System
Preparation for troubleshooting
(1) Disconnect the temperature switch connector.
(2) Check whether the glow plug is energized.
——Make sure the starting switch is in the ―OFF‖ position.
——Use a voltmeter to connect the cylinder wall and one of the glow plugs.
——Set the starting switch to the ―ON‖ position.
If the glow plug is energized, the voltmeter will show the voltage (12 V); it means the glow plug is not
energized if the hand stands still.
Checking Item and Position
Cause
Troubleshooting
When the glow plug is energized,
The indicator lamp of glow plug
is off.
Damaged glow plug indicator
lamp
Replace the glow plug indicator
lamp.
Quick start-up timer
Damaged quick start-up timer
Repair or replace the quick
start-up timer.
The glow plug indicator lamp is
on for 0.3 s.
Damaged quick start-up timer
Repair or replace the quick
start-up timer.
The glow plug indicator lamp is
on for 3.5 s.
(1) Start the diesel engine, set
the starting switch from ―ST‖ to
―ON‖, and the glow plug relay
(1) Replace the quick start-up
timer.
