Nissan Terrano model r20 series 2004. Instruction — part 152
IDLE CONTROL
Input/output signal line
Engine coolant temperature sensor
E
Engine coolant temperature
ECM
E
Electric
governor
Crankshaft position sensor (TDC)
E
Engine speed
Air conditioner switch
E
Air Conditioner operation
Control sleeve position sensor
E
Control sleeve position
Accelerator position switch
E
Idle position
Vehicle speed sensor
E
Vehicle speed
When the ECM determines that the engine speed is at idle, the fuel injection system is adapted for the idle
control. The ECM regulates the amount of fuel injected corresponding to changes in load applied to the engine
to keep engine speed constant. The ECM also provides the system with a fast idle control in response to the
engine coolant temperature.
NORMAL CONTROL
Input/output signal line
Crankshaft position sensor (TDC)
E
Engine speed
ECM
E
Electric
governor
Control sleeve position sensor
E
Control sleeve position
Accelerator position sensor
E
Accelerator position
Vehicle speed sensor
E
Vehicle speed
The amount of fuel injected under normal driving conditions is
determined according to sensor signals. The crankshaft position
sensor (TDC) detects engine speed and the accelerator position
sensor detects accelerator position. These sensors send signals to
the ECM.
The fuel injection data, predetermined by correlation between vari-
ous engine speeds and accelerator positions, are stored in the
ECM memory, forming a map. The ECM determines the optimal
amount of fuel to be injected using the sensor signals in compari-
son with the map.
SEF649S
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
TD27Ti
Fuel Injection System (Cont’d)
EC-330
FUEL TEMPERATURE COMPENSATION
Input/output signal line
Fuel temperature sensor
E
Fuel temperature
ECM
E
Electric
governor
Crankshaft position sensor (TDC)
E
Engine speed
Control sleeve position sensor
E
Control sleeve position
The amount of fuel leaking at or around high-pressure parts inside the fuel injection pump varies with the fuel
temperature and engine speed. This will result in a difference between the target amount of fuel injected and
the actual amount. The ECM compensates for the actual amount depending on the signal obtained from the
fuel temperature sensor.
DECELERATION CONTROL
Input/output signal line
Accelerator position sensor
E
Accelerator position
ECM
E
Electric
governor
Crankshaft position sensor (TDC)
E
Engine speed
The ECM cuts power supply delivery to the electric governor during deceleration for better fuel efficiency. The
ECM determines the time of deceleration according to signals from the accelerator position sensor and crank-
shaft position sensor (TDC).
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
TD27Ti
Fuel Injection System (Cont’d)
EC-331
Fuel Injection Timing System
SYSTEM DESCRIPTION
The fuel injection timing system determines the optimal fuel injection timing, based on engine speed, injection
quantity, engine coolant temperature and atmospheric pressure. The timing is formed by a basic value (Basic
Control) and two correction values. By performing a duty cycle signal on the timing control valve, the ECM
allows the valve to provide optimal injection timing. The ECM also performs feedback control on the timing
control valve using the signal from the needle lift sensor which detects the actual fuel injection timing.
BASIC CONTROL
Input/output signal line
Crankshaft position sensor (TDC)
E
Engine speed
ECM
E
Injection
timing con-
trol valve
Needle lift sensor
E
Injection timing
Control sleeve position sensor
E
Control sleeve position
The optimal fuel injection timing data, predetermined in proportion
to engine speeds and amount of fuel injected, are stored in the
ECM memory. The ECM uses the data to control the fuel injection
timing.
HIGH ALTITUDE COMPENSATION
Input/output signal line
Crankshaft position sensor
E
Engine speed
ECM
E
Injection
timing
control
device
Control sleeve position sensor
E
Control sleeve position
Atmospheric pressure sensor
E
Atmospheric sensor
Needle lift sensor
E
Injection timing
Fuel temperature sensor
E
Fuel temperature
E
Electric
governor
For better drivability in high altitude areas, the fuel injection timing
is advanced and the fuel quantity is reduced according to the atmo-
spheric pressure.
SEF650S
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
TD27Ti
EC-332
ENGINE COOLANT TEMPERATURE COMPENSATION (When starting)
Input/output signal line
Crankshaft position sensor (TDC)
E
Engine speed
ECM
E
Injection
timing con-
trol valve
Engine coolant temperature sensor
E
Engine coolant temperature
Needle lift sensor
E
Ignition timing
Ignition switch
E
Start signal
For better startability under cool engine conditions, the fuel injec-
tion timing is compensated according to the engine coolant tem-
perature.
ENGINE COOLANT TEMPERATURE COMPENSATION (During driving)
Input/output signal line
Crankshaft position sensor (TDC)
E
Engine speed
ECM
E
Injection
timing con-
trol valve
Engine coolant temperature sensor
E
Engine coolant temperature
Needle lift sensor
E
Injection timing
For better exhaust efficiency under cool engine conditions, the fuel
injection timing is controlled within a compensation range depend-
ing on the engine speed, engine coolant temperature and amount
of fuel injected.
MEC023E
SEF652S
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
TD27Ti
Fuel Injection Timing System (Cont’d)
EC-333
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