Nissan Silvia. Manual — part 125
System Diagram
NMEC0011
SEC320C
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Diagram
EC-15
Vacuum Hose Drawing
NMEC0012
SEC321C
Refer to “System Diagram”, EC-15 for Vacuum Control System.
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
Vacuum Hose Drawing
EC-16
System Chart
NMEC0013
Input (Sensor)
ECM Function
Output (Actuator)
I
Camshaft position sensor
I
Mass air flow sensor
I
Engine coolant temperature sensor
I
Heated oxygen sensor 1 (front)
I
Ignition switch
I
Throttle position sensor
I
Park/neutral position (PNP) switch
I
Air conditioner switch
I
Knock sensor
I
Battery voltage
I
Power steering oil pressure switch
I
Vehicle speed sensor
I
TCM (Transmission control module)
I
Dual pressure switch
I
Electrical load
Fuel injection & mixture ratio control
Injectors
Electronic ignition system
Power transistor
Idle air control system
IACV-AAC valve and IACV-FICD
solenoid valve
Fuel pump control
Fuel pump relay
Heated oxygen sensor monitor & on board
diagnostic system
MIL (On the instrument panel)
Heated oxygen sensor 1 heater (front) con-
trol
Heated oxygen sensor 1 heater
(front)
Wastegate valve control
Wastegate valve control solenoid
valve
Intake valve timing control
Intake valve timing control solenoid
valve
Air conditioning cut control
Air conditioner relay
Cooling fan control
Cooling fan relays
GI
MA
EM
LC
FE
CL
MT
AT
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
System Chart
EC-17
Multiport Fuel Injection (MFI) System
DESCRIPTION
NMEC0014
Input/Output Signal Chart
NMEC0014S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Camshaft position sensor
Engine speed and piston position
Fuel injec-
tion & mix-
ture ratio
control
Injectors
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
Park/neutral 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
Basic Multiport Fuel Injection System
NMEC0014S02
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
NMEC0014S03
In addition, the amount of fuel injected is compensated to improve engine performance under various oper-
ating conditions as listed below.
<Fuel increase>
I
During warm-up
I
When starting the engine
I
During acceleration
I
Hot-engine operation
I
When selector lever is changed from “N” to “D”
I
High-load, high-speed operation
<Fuel decrease>
I
During deceleration
I
During high engine speed operation
ENGINE AND EMISSION BASIC CONTROL SYSTEM DESCRIPTION
Multiport Fuel Injection (MFI) System
EC-18
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