Nissan Juke F15. Manual — part 452
STRUCTURE AND OPERATION
EC-621
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
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STRUCTURE AND OPERATION
Positive Crankcase Ventilation
INFOID:0000000012198195
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes
through the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.
PBIB0492E
PBIB1588E
EC-622
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
STRUCTURE AND OPERATION
On Board Refueling Vapor Recovery (ORVR)
INFOID:0000000012198196
From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.
WARNING:
When conducting inspections below, be sure to observe the following:
• Put a “CAUTION: FLAMMABLE” sign in workshop.
• Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Be sure to furnish the workshop with a CO
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fire extinguisher.
CAUTION:
• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-proof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to
- Disconnect battery ground cable.
• Always replace O-ring when the fuel gauge retainer is removed.
• Do not kink or twist hose and tube when they are installed.
• Do not tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine and check for fuel leaks at connection.
• Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.
JMBIA1930GB
SYSTEM
EC-623
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
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ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM : System Diagram
INFOID:0000000012198197
ENGINE CONTROL SYSTEM : System Description
INFOID:0000000012198198
ECM controls the engine by various functions.
JSBIA7177GB
EC-624
< SYSTEM DESCRIPTION >
[MR EXCEPT FOR NISMO RS MODELS]
SYSTEM
ENGINE CONTROL SYSTEM : Integrated Engine Control
INFOID:0000000012198199
SYSTEM DESCRIPTION
ECM calculates the target intake air amount and the target boost pressure according to the effective volume of
cylinder, operation rate of EGR, and boost pressure to achieve driving condition requested by the driver. ECM
properly combines the intake and exhaust air VTC, EGR valve, throttle valve, and turbocharger bypass control
valve based on the calculations.
Function
Reference
Engine oil pressure control
EC-635, "ENGINE OIL PRESSURE CONTROL SYSTEM : Sys-
tem Description"
EGR system
EC-637, "EGR SYSTEM : System Description"
Intake manifold runner control
EC-643, "INTAKE MANIFOLD RUNNER CONTROL : System De-
scription"
Thermal management control
EC-647, "THERMAL MANAGEMENT CONTROL : System De-
scription"
Fuel injection control
EC-630, "DIRECT INJECTION GASOLINE SYSTEM : System De-
scription"
Fuel pressure control
EC-633, "FUEL PRESSURE CONTROL : System Description"
Electric ignition control
EC-636, "ELECTRIC IGNITION SYSTEM : System Description"
Intake valve timing control
EC-639, "INTAKE VALVE TIMING CONTROL : System Descrip-
tion"
Exhaust valve timing control
EC-642, "EXHAUST VALVE TIMING CONTROL : System De-
scription"
Turbocharger boost control
EC-643, "TURBOCHARGER BOOST CONTROL : System De-
scription"
Engine protection control (Low engine oil pressure)
EC-644, "ENGINE PROTECTION CONTROL AT LOW ENGINE
OIL PRESSURE : System Description"
Air conditioning cut control
EC-645, "AIR CONDITIONING CUT CONTROL : System Descrip-
tion"
Cooling fan control
EC-646, "COOLING FAN CONTROL : System Description"
Starter motor drive control
EC-649, "STARTER MOTOR DRIVE CONTROL : System De-
scription"
Evaporative emission
EC-650, "EVAPORATIVE EMISSION SYSTEM : System Descrip-
tion"
Alternator power generation voltage variable control system
EC-651, "ALTERNATOR POWER GENERATION VOLTAGE
VARIABLE CONTROL SYSTEM : System Description"
Fuel filler cap warning system
EC-652, "FUEL FILLER CAP WARNING SYSTEM : System De-
scription"
ASCD (Automatic speed control device)
EC-653, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) :
System Description"
Nissan dynamic control
EC-654, "INTEGRATED CONTROL SYSTEM : System Descrip-
tion"
CAN communication
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