Geely EC718 2009 Workshop Manual page 101

Engine
2.Cylinder No.1,2,3,4 Fuel Injectors
Fuel injector is installed on the cylinder cover, in front of intake
valve. Based on ECM's instructions, it injects fuel during
specific period of time, to provide engine the fuel atomized fuel.
It also plays a role of storing high-pressure fuel to eliminate fuel
pump resonance caused by pumping fuel. The fuel pressure
remains stable. Fuel injector is an electromagnetic controlled
nozzle. The return spring inside the shell compresses needle
valve and seal the exit. During injection, the electronic
controller gives control signal, electromagnetic coil obtains
power, producing the magnetic field to overcome the return
spring pressure, needle gravity, friction, etc. lift the needle
valve. Under the pressure fuel sprays out. As the needle valve
only has rising and falling only two states, needle lift travel can
not be adjusted. As long as the pressure difference is constant,
fuel injection quantity only depends on the needle valve
opening time that is opening electrical pulse width.
Note
When the fuel injector is blocked or not closed tight, the
engine malfunction lamp may be lit. The detected DTC
code is: oxygen sensor distortion, signal erratic or Air-
Fuel ratio is not normal etc. At this point, carefully
diagnose the component fault. Because when the fuel
injector is blocked, the fuel injection amount is not
controlled by ECM fuel injection pulse width. The oxygen
sensor mixture concentration signal feedback to ECM
will very different from the theoretical value. ECM will
determine the oxygen sensor is not working properly.
The system can not determine whether it is the oxygen
sensor itself faulty or other associated components
faulty. Pay attention to determine the failure component
when diagnose such a fault.
ECM controls the fuel injectors through ECM harness
connector EN01 terminals No.50,63,49,64. If a fuel injector or
circuit is fault, DTC code P0201, P0202, P0203, P0204, P0261,
P0262, P0264, P0265, P0267, P0268, P0270, P0271 will be
recorded.
3. Ignition Coil
FE02-5131b
Cylinder No.1,4 ignition coil is located at top of the cylinder No.
4. Cylinder No.2,3 ignition coil is located at top of the cylinder
No.2. Ignition coil primary winding low voltage will be
transformed into the secondary winding high voltage. The
spark plug discharges spark, igniting the air and fuel mixture
inside the cylinder. Ignition coil consists of a primary winding,
a secondary winding, iron core, shell and other components.
When the primary winding is connected to ground, it will be
charged. Once ECM cuts off the primary winding circuit, then
charging will be terminated, while a high voltage induced in the
secondary winding, so that spark plug discharges. Different
from the ignition coil with a distributor, the ignition coil
secondary winding is connected to a spark plug at each end,
so the two spark plug discharge at the same time. ECM controls
the ignition coil through ECM harness connector EN01
terminals No.3,7. When an ignition related fault occurs, DTC
code P0300, P0301, P0302, P0303, P0304 will be recorded.
Control System JL4G18-D
EC718/EC718RV EC715/EC715RV 10/2009
2-19
FE02-5132b