JAC J2 User Manual



Maintenance Manual for J2 Sedan
Electronic Control System
of Engine
164
Illustration of Engine Control System
Note:
This
diagram
is
the
control
diagram,
if
the
sensor
location
doesn’t
match
with
physical parts, actual conditions should prevail.

II.
Multiple-point
Fuel
Injection
System
1.

System
Descriptio
n
Multiple-point fuel injection (MPI) system comprises of the sensor detecting engine operation and the
electronic control module (ECM).
The system is controlled based on signals from these sensors; actuators operate under control of the
ECM. ECM functions include fuel injection control, idle control and ignition timing control etc. and
some trouble diagnosis means for simplifying the
troubleshoot
ing in case of trouble.
2.
Input/Output
Signal
List of
Input/Output Signal
Sensor
Input Signal of
ECM
ECM
Function
Actuator
Hall sensor
Engine speed
Piston position
Absolute intake pressure sensor
Intake quantity
Oxygen sensor
Oxygen
concentration in
exhaust
Throttle
opening
sensor
Throttle
opening
Knock
sensor
Knock
of
engine
Air conditioner switch
Air
condition
er
pressure
Wheel
speed
sensor
V
ehicle
speed
Coolant temperature sensor Coolant
temperature
Control fuel
injection and
mixing
Fuel injector
3. Starting Control
Special measures should be used to control the air flow, fuel injection and ignition timing during starting.
At the beginning of starting, air in the intake manifold is still and the internal pressure of the intake
manifold is ambient air pressure. Throttle closed and the electronic throttle is designated as a fixed
paramet
er depends on
temper
ature. In similar
process, a specific "injection timing" is designated as
the
initial injection pulse. Fuel injection amount varies according to engine temperature in order to promote
fuel film formation on intake manifold and cylinder walls; thus, when the engine reaches a certain speed,
mixture should be thicker. Once the engine starts to run, the system immediately begin to reduce the
mixture concentration At end of starting cycle, the starting enrichment function will be completely

JAC J2 Specifications

General

Brand	JAC
Model	J2
Category	Automobile
Language	English