Nissan Terrano r20e. Instruction — part 167
System Chart
Crankshaft position sensor
(TDC)
E
ECM
Control sleeve position sensor
E
Fuel temperature sensor
E
Mass air flow sensor
E
Engine coolant temperature sen-
sor
E
Needle lift sensor
E
Accelerator position sensor
E
Accelerator position switch
E
Air conditioner switch
E
Ignition switch
E
Battery voltage
E
Vehicle speed sensor
E
Brake switch
E
Atmospheric pressure sensor
(inside ECM)
E
E
Fuel injection control
E
Electric governor
E
Fuel injection timing control
E
Injection timing control valve
E
Fuel cut control
E
Fuel cut solenoid valve
E
Glow control system
E
Glow relay & glow lamp
E
On board diagnostic system
E
Malfunction indicator lamp
(On the instrument panel)
E
EGR valve & Throttle control
valve control
E
EGRC-solenoid valve A, B and
throttle control solenoid valve
(models for Germany)
E
Air conditioning cut control
E
Air conditioner relay
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
TD27Ti
EC-305
Fuel Injection System
SYSTEM DESCRIPTION
Three types of fuel injection control are provided to accommodate engine operating conditions; normal control,
idle control and start control. The ECM determines the appropriate fuel injection control. Under each control,
the amount of fuel injected is compensated to improve engine performance. The ECM performs duty cycle
control on the electric governor (built into the fuel injection pump) according to sensor signals to compensate
the amount of fuel injected to the preset value.
START CONTROL
Input/output signal line
Engine coolant temperature sensor
E
Engine coolant temperature
ECM
E
Electric
governor
Crankshaft position sensor (TDC)
E
Engine speed
Control sleeve position sensor
E
Control sleeve position
When the ECM receives a start signal from the ignition switch, the
ECM adapts the fuel injection system for the start control. The
amount of fuel injected at engine starting is a preset program value
in the ECM. The program is determined by the engine speed and
engine coolant temperature.
For better startability under cool engine conditions, the lower the
coolant temperature becomes, the greater the amount of fuel
injected. The ECM ends the start control when the engine speed
reaches a value between 800 rpm and 1,200 rpm, which is deter-
mined by the engine coolant temperature and shifts the control to
the normal or idle control.
SEF648S
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTION
TD27Ti
EC-306
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-307
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-308
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