Nissan Terrano model r20 series 2004. Instruction — part 151
System Diagram
YEC695A
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
TD27Ti
EC-326
Vacuum Hose Drawing
q
1
Throttle body control valve actuator
to throttle body control solenoid
valve
q
2
EGR valve to 3-way connector
q
3
EGRC-solenoid valve A to 3-way
connector-1
q
4
EGRC-solenoid valve B to 3-way
connector-1
q
5
Throttle body control solenoid
valve to 2-way connector-2
q
6
EGRC-solenoid valve A to 3-way
connector-2
q
7
Tube to 3-way connector-2
q
8
Tube to vacuum pump
q
9
Tube to brake booster
Refer to “System Diagram”, on previous page for vacuum control system
NEF759
ENGINE AND EMISSION CONTROL OVERALL SYSTEM
TD27Ti
EC-327
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
(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-328
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-329
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