Nissan Juke F15. Instruction — part 456
SYSTEM
EC-637
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
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The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor (PHASE) sig-
nal. Computing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
• At starting
• During warm-up
• At idle
• At low battery voltage
• During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
EGR SYSTEM
EGR SYSTEM : System Description
INFOID:0000000012198208
SYSTEM DIAGRAM
JSBIA7178GB
EC-638
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
SYSTEM
SYSTEM DESCRIPTION
EGR VOLUME CONTROL
The EGR volume control regulates the flow rate of exhaust gas flowing from downstream of exhaust manifold
catalyst to intake manifold. The exhaust gas flow rate is controlled by opening/closing the EGR path in the
EGR control valve.
A built-in DC motor moves the valve continuously corresponding to the ECM output signal.
The EGR volume control valve position sensor detects the valve position and sends the voltage signals to the
ECM.
The adoption of water-cooled EGR cooler reduces the knocking by efficiently cooling the gas circulated by the
EGR system to lower the combustion temperature and improves fuel efficiency by raising the thermal effi-
ciency.
The ECM judges the current opening angle of the valve from this signals and the ECM controls the DC motor
to make the valve opening angle properly.
The opening angle of the valve varies for optimum engine control. The optimum value stored in the ECM is
determined by considering various engine conditions.
The EGR volume control valve remains close under the following conditions.
• Engine stopped
• Engine starting
• Low engine coolant temperature
• Excessively high engine coolant temperature
• High engine speed
• Accelerator pedal fully depressed
• Low intake air temperature
INTAKE VALVE TIMING CONTROL
INTAKE VALVE TIMING CONTROL : System Diagram
INFOID:0000000012198209
JSBIA5478GB
JPBIA4760GB
SYSTEM
EC-639
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
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INTAKE VALVE TIMING CONTROL : System Description
INFOID:0000000012198210
INPUT/OUTPUT SIGNAL CHART
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-
noid valve 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 INTERMEDIATE LOCK CONTROL
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
JPBIA5034GB
EC-640
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
SYSTEM
System Diagram
System Description
The intake valve timing intermediate lock control improves the cleaning ability of exhaust gas at cold starting
by fixing the camshaft sprocket (INT) with two lock keys and bringing the cam phase into intermediate phase.
Cam phase is fixed at the intermediate phase by two lock keys in the camshaft sprocket (INT). Lock key 1 con-
trols retard position and lock key 2 controls advance position.
ECM controls the intermediate phase lock by opening/closing the intake valve timing intermediate lock control
solenoid valve to control oil pressure acting on the lock key and locking/unlocking the lock key.
Lock/Unlock Activation
When ECM activates the intake valve timing intermediate lock control solenoid valve, oil pressure generated in
the oil pump is drained through the oil pressure path in the control valve. Since oil pressure is not acted on the
lock key, the lock key position is fixed by the spring tension and the cam phase is fixed at the intermediate
phase.
When ECM deactivates the intake valve timing intermediate lock control solenoid valve, unlocking oil pressure
acts on each lock key. Lock key 1 is not released because it is under load due to sprocket rotational force. For
this reason, lock key 2 is released first by being pushed up by unlocking oil pressure. When lock key 2 is
released, some clearance is formed between lock key 1 and the rotor due to sprocket rotational force and
JPBIA5973GB
JPBIA6317GB
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