Engine Electrical System
Troubleshooting: The common malfunctions of the
fuel pump are representation of insufficient fuel
pressure, not pumping fuel and so on. It shall be
verified firstly in troubleshooting that the fuel pressure
is within rated range and the pipeline is leaked. In
addition both the positive and negative pressure of the
fuel tank will have impacts on the fuel system.
※Solenoid fuel injector
Function: The fuel injector supplies atomized fuel to
the engine through injecting the fuel within the required
time according to the demand from the ECU.
Structure and working principle: The ECU sends the
electrical pulse to the fuel injector coil for generate a
magnetic force. If the magnetic force is increased
enough to overcome the composite force of the release
spring pressure force, the gravity force of needle valve,
and the friction force, the needle valve will begin to
rise and the fuel injection will start. The maximum lift
range of the needle valve is no more than 0.1mm.
When the fuel injection pulse ends, the pressure force
of the release spring will make the needle valve close
again.
Notes on installation: Only the specific connector can
be used in the fixed fuel injector and shall not be
mixed.
For the convenience of installation it is recommended
that the upper O ring connected to the fuel distributor
pipe shall be coated with silica-free clean oil. Pay
attention not to make oil contaminate the inside of the
fuel injector and the injection hole.
Place the fuel injector in the fuel injector base in
vertical direction and fasten the injector on the base by
the clasp.
Note: As for the car not being used for a long time, it is
possible that such car can not start properly because the
coagulation of fuel in the fuel injector. Under such
circumstance verify carefully that the fuel injector is
coagulated.
Fault diagnosis: The electrical injection system of A15
RHD car can conduct fault diagnosis on the driving
stage of the fuel injector in stead of conducting fault
diagnosis on its self. If the driving stage of the fuel
injector is short or overloaded to the battery power
supply, short to ground or open, the malfunction flag
E-16
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