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 >

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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

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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