MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
392
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 6-1-22 DELPHI common-rail system ECU
Fig. 6-1-23 BOSCH common-rail system ECU
(4) Put one end of fuel injector ballast on the ballast
support bolt and then put the other end in the ballast
groove.
(5) Install the fastening bolt components of fuel injector
ballast, and tighten them with required torques. Any
leakage on the fuel injector gasket is not allowed.
Tightening torques for fastening bolt components
of fuel injector ballast:
25 N•m~35 N•m
Attention:
during the fuel injector installation,
keep the fuel injector clean. Do not bump or drop the
fuel injector.After the installation, the fuel inlet pipe
opening of the fuel injector assembly shall face the rear
end of the engine.
(6) Install the harness plugs of fuel injector.
2.6 ECU (Electronic Control Unit)
ECU is the abbreviation for the electronic control unit of
common-rail system. Its built-in processor chip is
responsible for collecting the signals from all sensors,
calculating the parameters, controlling the rail pressure,
fuel injection volume and injection timing and achieving
other functions like diagnosis and communication.
2.6.1 DELPHI ECU
For the ECU configured for DELPHI common-rail
system, see Fig. 6-1-22.
2.6.2 BOSCH ECU
For the ECU configured for BOSCH common-rail
system, see Fig. 6-1-23.
2.6.3 XINFENG ECU
For the ECU configured for XINFENG common-rail
system, see Fig. 6-1-24.
2.6.4 Usage Precautions:
(1) Users shall not open the ECU without permission,
since it is a precise electrical component.
(2) The temperature of ECU installation place shall be
-40
℃
~80
℃
.ECU shall be kept dry at any time. In order
to ensure its heat dissipation, no cover or dust shall be
kept at the ECU installation position.
(3) ECU and connectors shall not be directly shocked
by water.
