Nissan X-Trail 32. Manual — part 732
SYSTEM
EC-57
< SYSTEM DESCRIPTION >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
• When deceleration (accelerator pedal ON
→
OFF), ECM controls the engine speed by optimizing throttle
opening to minimize shift shock and exhaust gas emission.
COOLING FAN CONTROL
COOLING FAN CONTROL : System Description
INFOID:0000000010775041
System Diagram
SYSTEM DESCRIPTION
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [ HIGH/LOW/OFF ].
Cooling Fan Operation
ECM transmits a pulse duty (PWM) signal to IPDM E/R.
IPDM E/R has threshold value to the pulse duty (PWM) signal and
operates cooling fan motor with three phases of [HI (high-speed) /
LOW (low-speed) /OFF].
Cooling Fan Relay Operation
The ECM controls cooling fan relays in IPDM E/R through CAN communication line.
INTAKE VALVE TIMING CONTROL
JSBIA5006GB
: Less than 30% (OFF
←
low-speed)
: More than 40% (OFF
→
low-speed)
: Less than 50% (low-speed
←
high-speed)
: More than 60% (low-speed
→
high-speed)
JSBIA5007GB
Cooling fan speed
Cooling fan relay
1
2
3
Stop (OFF)
OFF
OFF
OFF
Low (LOW)
OFF
ON
OFF
High (HI)
ON
OFF
ON
EC-58
< SYSTEM DESCRIPTION >
[MR20DD]
SYSTEM
INTAKE VALVE TIMING CONTROL : System Description
INFOID:0000000010775042
System Diagram
System Description
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the intake
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine coolant
temperature. Then, the ECM sends ON/OFF pulse duty signals to the intake valve timing (IVT) control sole-
noidvalve depending on driving status. This makes it possible to control the shut/open timing of the intake
valve to increase engine torque in low/mid speed range and output in high-speed range.
Intake Valve Timing Control Solenoid Valve
Intake valve timing control solenoid valve is activated by ON/OFF pulse duty (ratio) signals from the ECM.
Intake valve timing control solenoid valve controls the timing of intake valve opening/closing optimally by
changing duty ratio depends on the driving conditions.
JPBIA4760GB
JPBIA5034GB
SYSTEM
EC-59
< SYSTEM DESCRIPTION >
[MR20DD]
C
D
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EC
N
P
O
INTAKE VALVE TIMING CONTROL FEEDBACK CONTROL
Cam Position Detection
The camshaft position sensor mounted at the rear of the cylinder head detects a cam position, by using the
groove on the plate located at the rear of the intake camshaft.
Feedback Control
The camshaft position sensor feeds back an actual cam position signal to ECM. Based on the signal, ECM
controls the intake valve timing control solenoid valve to satisfy the optimum target valve opening/closing tim-
ing according to a driving condition.
EXHAUST VALVE TIMING CONTROL
EXHAUST VALVE TIMING CONTROL : System Description
INFOID:0000000010775043
System Diagram
SYSTEM DESCRIPTION
With the exhaust valve timing controller which controls the phase of exhaust camshaft to optional position con-
tinuously, ECM improves both low-middle speed torque and high speed performance, emission and fuel effi-
ciency by optimizing the exhaust valve open/close timing according to driving conditions.
The exhaust valve timing controller is hydraulically controlled by the exhaust valve timing control solenoid
valve.
Status of intake valve timing so-
lenoid valve
Intake valve timing controller activation
Engine OFF
When starting the engine, the controller vane and sprocket are fixed in full retard position by the
reaction force of return spring, improving the starting performance of the engine.
Active (Advanced angle)
When the energization rate to the control solenoid valve is increased, the oil pressure from the oil
pump is conveyed to the advance angle chamber of the controller. And retard angle chamber oil is
drained.
Accordingly, the controller vane rotates rightward and the phase of camshaft becomes advance an-
gle.
This condition brings about the greater overlap with the exhaust valve, enabling the exhaust gas
cleaning by the internal EGR effect and the fuel consumption improvement by the reduction in
pumping loss.
Neutral (Maintained)
When it is the target valve timing, the energization rate to the control solenoid valve is adjusted to
the intermediate state. The solenoid valve is positioned at the neutral position and the oil path is
interrupted to maintain the cam shaft phase.
Return (Retard angle)
When the energization rate to the control solenoid valve is decreased, the oil pressure from the oil
pump is conveyed to the retard chamber of the controller. And advanced angle chamger oil is
drained.
Accordingly, the controller vane rotates leftward and the phase of camshaft becomes retard angle.
JSBIA5015GB
EC-60
< SYSTEM DESCRIPTION >
[MR20DD]
SYSTEM
This mechanism hydraulically controls cam phases continuously with the fixed operating angle of the exhaust
valve.
The ECM receives signals such as crankshaft position, camshaft position, engine speed, and engine oil tem-
perature. Then, the ECM sends ON/OFF pulse duty signals to the exhaust valve timing control solenoid valve
depending on driving status. This makes it possible to control the shut/open timing of the exhaust valve to
increase engine torque and output in a range of high engine speed.
EXHAUST VALVE TIMING CONTROL SOLENOID VALVE CONTROL
The exhaust valve timing control solenoid valve is driven ON-OFF (duty control) by ECM output signal, and
controls the open/close timing of the exhaust valve to the optimum by changing its duty ratio according to the
vehicle's driving condition.
EXHAUST VALVE TIMING CONTROL FEEDBACK CONTROL
JPBIA5035GB
Exhaust valve timing control so-
lenoid valve condition
Exhaust valve timing controller operation
Engine OFF
When starting the engine, the controller vane and sprocket are fixed in full advanced position by the
reaction force of return spring, improving the starting performance of the engine.
Active (Retard angle)
When the energization rate to the control solenoid valve is increased, the oil pressure from the oil
pump is conveyed to the retard angle chamber of the controller. And advanced angle chamber oil
is drained. Accordingly, the controller vane rotates leftward and the phase of camshaft becomes re-
tard angle.This condition brings about the greater overlap with the intake valve, enabling the ex-
haust gas cleaning by the internal EGR effect and the fuel consumption improvement by the
reduction in pumping loss.
Neutral (Maintained)
When it is the target valve timing, the energization rate to the control solenoid valve is adjusted to
the intermediate state. The solenoid valve is positioned at the neutral position and the oil path is
interrupted to maintain the cam shaft phase.
Return (Advanced angle)
When the energization rate to the control solenoid valve is decreased, the oil pressure from the oil
pump is conveyed to the advanced chamber of the controller. And retard angle chamber oil is
drained.Accordingly, the controller vane rotates rightward and the phase of camshaft becomes ad-
vanced angle.
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