Fuel System: 1G-2
General Description
Electronic Fuel Injection System Description
Z9J0111701001
The fuel injection system used by the DF70 / 80 / 90 is a speed-density, multi-point, sequential, electronic fuel injection
type.
The fuel injection system is composed of the fuel line components, air intake components, and components for system
control (ECM, sensors, switches, etc.).
Fuel Injection Control System Outline
Sensors are mounted at precise locations on the motor to monitor the current conditions of engine operation and send
signals to the ECM.
Based on these signals, the ECM determines the optimum fuel injection time duration (fuel amount), fuel injection
timing (multi-point sequential timing) and controls the injector operating signals accordingly.
In regards to fuel injection timing, the fuel injection end timing is set depending on engine rpm. The ECM calculates
the amount of fuel injection based on the engines operating conditions, and determines the fuel injection start timing.
In the injection timing chart below, the injection end timing is set at 0° BTCD on the exhaust stroke.
Basic sensors
MAP sensor:
Informs ECM of intake manifold pressure.
Compensating sensors
Cylinder temperature sensor:
Informs ECM of cylinder temperature.
Others
CMP sensor:
Informs ECM of camshaft angle.
Shift position sensor:
Informs ECM of shift position (neutral or in-gear).
Exhaust manifold temperature sensor:
Informs ECM of exhaust manifold temperature.
IAT sensor:
Informs ECM of intake air temperature.
TPS (Throttle position sensor):
Informs ECM of throttle opening angle.
Battery voltage:
Constantly monitored by the ECM.
CKP sensor:
Informs ECM of engine speed and crankshaft angle.
ECM
Signal Signal Signal Signal
Fuel amount compensation
Multi-point sequential timing
Fuel injection time duration
(amount) is determined by
a digital map designed in
relation to intake manifold
pressure and engine
speed.
Injector
A A A A
Battery
charge
coil
Rectifier &
regulator
40A fuse
30A fuse
15A fuse
Battery
ECM
main
relay
Ignition
switch
ECM
CPU
Injector
Sensor / switch
signal input
I9J011170001-02
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