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Multiport Fuel Injection (MFI) System
DESCRIPTION
NGEC0014
Input/Output Signal Chart
NGEC0014S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor Engine speed and piston position
Fuel injec-
tion & mix-
ture ratio
control
Injector
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Heated oxygen sensor 1 (front) Density of oxygen in exhaust gas
Throttle position sensor
Throttle position
Throttle valve idle position
PNP switch Gear position
Vehicle speed sensor Vehicle speed
Ignition switch Start signal
Air conditioner switch Air conditioner operation
Knock sensor Engine knocking condition
Battery Battery voltage
Power steering oil pressure switch Power steering operation
Heated oxygen sensor 2 (rear)* Density of oxygen in exhaust gas
* Under normal conditions, this sensor is not for engine control operation.
Basic Multiport Fuel Injection System
NGEC0014S02
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the camshaft position sensor and the mass air
flow sensor.
Various Fuel Injection Increase/Decrease Compensation
NGEC0014S03
In addition, the amount of fuel injected is compensated to improve engine performance under various oper-
ating conditions as listed below.
<Fuel increase>
쐌 During warm-up
쐌 When starting the engine
쐌 During acceleration
쐌 Hot-engine operation
쐌 High-load, high-speed operation
<Fuel decrease>
쐌 During deceleration
쐌 During high engine speed operation
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
KA24DE
Multiport Fuel Injection (MFI) System
EC-29
GI
MA
EM
LC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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