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 Description
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 troubleshooting 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 conditioner
pressure
Wheel speed sensor
Vehicle 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
parameter depends on temperature. 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