Nissan Sentra. Manual — part 336
EC-40
< SYSTEM DESCRIPTION >
[MRA8DE]
SYSTEM
INPUT/OUTPUT SIGNAL CHART
SYSTEM DESCRIPTION
This engine is equipped with an intake valve timing controller (integral with cam sprocket) which continuously
adjusts the phase of intake valve according to driving conditions, improves both low/mid range engine torque
and high-speed range engine output, and brings about low emission and low fuel consumption.
The intake valve timing control system continuously controls cam phases in constant intake valve operating
angle conditions and adjusts an operating oil pressure to the intake valve timing controller via the control sole-
noid valve.
ECM receives crankshaft position signal, camshaft position signal, engine speed signal, engine oil tempera-
ture signal, and engine coolant temperature signal. And the ECM outputs ON/OFF pulse duty signals to the
intake valve timing control solenoid valve depending on driving status.
Intake Valve Timing Controller Operation List
JPBIA4760GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed and piston position
Intake valve tim-
ing control
Intake valve timing con-
trol solenoid valve
Camshaft position sensor (PHASE)
Engine oil temperature sensor
Engine oil temperature
Engine coolant temperature sensor
Engine coolant temperature
Combination meter
CAN commu-
nication
Vehicle speed signal
JSBIA2822GB
SYSTEM
EC-41
< SYSTEM DESCRIPTION >
[MRA8DE]
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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:0000000009758365
SYSTEM DIAGRAM
INPUT/OUTPUT SIGNAL CHART
Intake valve timing solenoid
valve condition
Intake valve timing controller operation
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 (Advance 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 ad-
vance angle.
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.
JPBIA4761GB
EC-42
< SYSTEM DESCRIPTION >
[MRA8DE]
SYSTEM
SYSTEM DESCRIPTION
This engine is equipped with an exhaust valve timing controller (integral with cam sprocket) which continu-
ously adjusts the phase of intake valve according to driving conditions, improves both low/mid range engine
torque and high-speed range engine output, and brings about low emission and low fuel consumption.
The exhaust valve timing control system continuously controls cam phases in constant exhaust valve operat-
ing angle conditions and adjusts an operating oil pressure to the exhaust valve timing controller via the control
solenoid valve.
ECM receives exhaust valve timing control position signal, crankshaft position signal, engine speed signal,
engine oil temperature signal, and engine coolant temperature signal. And the ECM outputs ON/OFF pulse
duty signals to the exhaust valve timing control solenoid valve depending on driving status.
Exhaust Valve Timing Controller Operation List
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed and piston position
Exhaust valve
timing control
Exhaust valve timing control
solenoid valve
Camshaft position sensor (PHASE)
Engine oil temperature sensor
Engine oil temperature
Exhaust valve timing control position
sensor
Exhaust valve timing signal
Combination meter
CAN commu-
nication
Vehicle speed signal
JSBIA2823GB
Exhaust valve timing solenoid
valve condition
Exhaust valve timing controller operation
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 (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 advance angle chamber oil is
drained. Accordingly, the controller vane rotates leftward and the phase of camshaft becomes retard
angle.
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 (Advance angle)
When the energization rate to the control solenoid valve is decreased, 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.
SYSTEM
EC-43
< SYSTEM DESCRIPTION >
[MRA8DE]
C
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G
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EC
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P
O
EXHAUST VALVE TIMING CONTROL FEEDBACK CONTROL
Cam Position Detection
The exhaust valve control 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 exhaust valve control position sensor feeds back an actual cam position signal to ECM. Based on the sig-
nal, ECM controls the exhaust valve timing control solenoid valve to satisfy the optimum target valve opening/
closing timing according to a driving condition.
INTAKE MANIFOLD RUNNER CONTROL
INTAKE MANIFOLD RUNNER CONTROL : System Description
INFOID:0000000009758366
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
Intake manifold runner control valve has a valve portion in the intake passage of each cylinder.
While idling and during low engine coolant temperature, the intake manifold runner control valve closes. Thus
the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a
intake manifold runner in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve
exhaust emission, and increase the stability in running conditions.
Also, except when idling and during low engine coolant temperature, this system opens the intake manifold
runner control valve.
In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow
resistance.
The intake manifold runner control valve is operated by the ECM.
INTAKE MANIFOLD TUNING SYSTEM
INTAKE MANIFOLD TUNING SYSTEM : System Description
INFOID:0000000009758367
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
JPBIA6226GB
JSBIA2817GB
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