Chapter III Malfunction Diagnosis and Troubleshooting
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
103
problem
(7) Malfunction of the exhaust gas
bypass valve
(8) Leakage of the turbocharger gas
compressor
(9) Coolant temperature sensor
(10) High pressure fuel rail pressure
sensor
(11) Fuel injector, high pressure oil
pump
(6) Adjust the position of the accelerator pedal
position sensor.
(7) Overhaul the exhaust gas bypass valve.
(8) Check the sealing condition of the
turbocharger, replace the sealer if necessary.
(9) Overhaul the coolant temperature sensor.
(10) Overhaul the high pressure fuel rail
pressure sensor.
(11) Check and test the fuel injector and the
high pressure oil pump.
Diesel
engine
exhausting
white or blue
smoke
(1) Coolant temperature sensor
(2) Air left in the fuel system
(3) Blockage of the low pressure oil
circuit
(4) Preheat system
(5) Overhigh oil level of the lubrication
system
(1) Check the coolant temperature sensor.
(2) Exhaust air from the fuel system.
(3) Check the low pressure oil circuit.
(4) Overhaul the preheat system.
(5) Check the lubrication system oil level and
drain off the excessive engine oil.
Diesel
engine
exhausting
black smoke
(1) Blockage of the air cleaner
(2) Coolant temperature sensor
(3) Malfunction of the turbocharger
(4) Fuel injector and its control circuit
(rare)
(5) Vacuum pump
(1) Maintain or replace the filter core of the air
cleaner.
(2) Check the coolant temperature sensor.
(3) Check the turbocharger.
(4) Check the fuel injector and its control
circuit.
(5) Check whether the vacuum system is
normal.
Overheating
diesel engine
(1) Incorrect fuel
(2) Coolant temperature sensor
(3) Cooling fan
(4) Cooling fan circuit
(1) Add the specified grade of fuel.
(2) Check the coolant temperature sensor.
(3) Overhaul the cooling fan.
(4) Overhaul the cooling fan circuit.
12. Diesel Engine Wobble During Idling
Checking Item and Part
Cause of Malfunction
Troubleshooting
Fuel
Unqualified fuel
Replace it with the specified
grade of fuel.
Fuel system
Air and water left in the fuel
system
Exhaust air and water from the
fuel system.
Low pressure oil circuit
Blockage or overlow pressure of
the low pressure oil circuit; oil
Check, repair or replace the
corresponding
parts
of
fuel
