MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
102
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
(winter)
(8) Blockage or overlow temperature
of the low pressure oil circuit
(9) overlow pressure of the high
pressure oil circuit
(10) High pressure fuel rail pressure
adjustor
(11) Bad performance or control
malfunction of the fuel injector
(winter).
(8) Check the low pressure oil circuit.
(9) Check the high pressure oil circuit, high
pressure fuel pump and pressure control
device.
(10) Check the high pressure fuel rail pressure
adjustor.
(11) Check or replace the fuel injector.
(continued)
Position and Phenomenon of Malfunction
Troubleshooting
Diesel
engine
running at a
high idle
speed
Accelerator pedal position sensor
Check the accelerator pedal position sensor.
Cylinder
knocking
during
warming-up
or
acceleration
of the engine
(1) Coolant temperature sensor
(2) Fuel injector connecting circuit
(3) Malfunction of the injector
(1) Check the coolant temperature sensor.
(2) Check the fuel injector connecting circuit.
(3) Check or replace the fuel injector.
Diesel
engine
wobble
during idling
(1) Incorrect fuel
(2) Air left in fuel system
(3) Blockage of overlow pressure of
the low pressure oil circuit
(4) Bad performance of the fuel injector
(5) Fuel i
njector circuit
(6) High pressure fuel rail pressure
sensor, high pressure fuel rail pressure
adjustor
(7) High pressure fuel pump
(1) Add the specified grade of fuel.
(2) Exhaust air from the fuel system.
(3) Check low pressure oil circuit.
(4) Check or replace the fuel injector.
(5) Check the fuel injector circuit.
(6) Overhaul the high pressure fuel rail
pressure sensor, high pressure fuel rail
pressure adjustor
(7) Check and adjust the high pressure fuel
pump.
In sufficient
power of the
diesel engine
in all ranges
(1) Vacuum system
(2) Blockage of the air cleaner
(3) Incorrect fuel
(4) Blockage of overlow pressure of
the low pressure oil circuit
(5) Failure of the turbocharger
(6) Wrong position of the accelerator
pedal position sensor or signal
(1) Check whether the vacuum adjustor is
normal.
(2) Maintain or replace the filter core of air
cleaner.
(3) Add
the
specified
grade
of
fuel
(CBI9147-2009 motor diesel).
(4) Check the low pressure oil circuit.
(5) Overhaul or replace the turbocharger.
