Nissan X-Trail 32. Manual — part 733
SYSTEM
EC-61
< SYSTEM DESCRIPTION >
[MR20DD]
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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 exhaust camshaft.
Feedback Control
The camshaft position sensor feeds back an actual cam position signal to ECM. Based on the signal, 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:0000000010775044
System Diagram
SYSTEM DESCRIPTION
The intake manifold runner control valve installed at intake manifold generates swirl flow (revolving flow) in
combustion chamber, and by that effect air-fuel mixture is homogenized so that stabilizes combustion. The
intake manifold runner control valve is driven by DC motor and controlled by ECM.
IDLING, LOW SPEED·SMALL LOAD RANGE
With intake manifold runner control valve closed the flowing field of
swirl flow (revolving flow) is generated by increased flow speed of
gas and improves combustion so that enables stable combustion.
MIDDLE·HIGH SPEED RANGE
JSBIA5013GB
JSBIA1215JP
EC-62
< SYSTEM DESCRIPTION >
[MR20DD]
SYSTEM
• With intake manifold runner control valve opened the flowing field
mainly consist of tumble (vertical revolving flow) by atomizer, port
shape and shallow piston head is generated.
• Which makes more swirl remained at the latter half of compression
process so that improves combustion and enables stable combus-
tion.
OPERATION OF INTAKE MANIFOLD RUNNER CONTROL VALVE
When the engine is idling or running at slow speed the vales are closed and swirl flow is generated. By closing
valves the flowing speed of gas is increased and it stabilizes combustion also improves fuel efficiency.
ENGINE PROTECTION CONTROL AT LOW ENGINE OIL PRESSURE
ENGINE PROTECTION CONTROL AT LOW ENGINE OIL PRESSURE : System De-
scription
INFOID:0000000010775045
System Diagram
SYSTEM DESCRIPTION
• The engine protection control at low engine oil pressure warns the driver of a decrease in engine oil pres-
sure by the engine oil pressure warning lamp before the engine becomes damaged.
• When detecting a decrease in engine oil pressure at an engine speed less than 1,000 rpm, ECM transmits
an engine oil pressure warning lamp signal to the combination meter.The combination meter turns ON the
engine oil pressure warning lamp, according to the signal.
• When detecting a decrease in engine oil pressure at an engine speed 1,000 rpm or more, ECM transmits an
engine oil pressure warning lamp signal to the combination meter. When detecting a decrease in engine oil
pressure, ECM cuts fuel if the engine speed exceeds the specified value. Refer to
JSBIA1214JP
Valve position
operating condition
Valve closed
Idling, low ·small load range
Valve opened
Other than above
JSBIA1212JP
JSBIA1213JP
JSBIA4201GB
SYSTEM
EC-63
< SYSTEM DESCRIPTION >
[MR20DD]
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*: When detecting a normal engine oil pressure, ECM turns OFF the engine oil pressure warning lamp.
AIR CONDITIONING CUT CONTROL
AIR CONDITIONING CUT CONTROL : System Description
INFOID:0000000010775046
System Diagram
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air compressor is turned off.
• When the accelerator pedal is fully depressed (selector lever is in R position).
• When cranking the engine.
• At high engine speeds.
• When the engine coolant temperature becomes excessively high.
• When operating power steering during low engine speed or low vehicle speed.
• When engine speed is excessively low.
• When refrigerant pressure is excessively low or high.
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Decrease in engine oil
pressure
Engine speed
Combination meter
Fuel cut
Engine oil pressure warning lamp
Detection
Less than 1,000 rpm
ON
*
NO
1,000 rpm or more
ON
YES
JSBIA5011GB
EC-64
< SYSTEM DESCRIPTION >
[MR20DD]
SYSTEM
AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description
INFOID:0000000010775047
System Diagram
BASIC ASCD SYSTEM
CAUTION:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
• Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal by driver
′
s setting of vehicle speed
*
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*: Driver can set the vehicle speed between approximately 40 km/h (25 MPH) and 172 km/h [107 MPH (for
CVT)] or 181 km/h [112 MPH (for M/T)].
• ECM transmits a ASCD operation status signal to the combination meter and operation status of ASCD is
indicated on the information display in the combination meter. Refer to
TROL DEVICE (ASCD) : Switch Name and Function"
.
• If any malfunction occurs in ASCD system, it automatically deactivates control.
CANCEL OPERATION
• When any of following conditions exist, cruise operation will be canceled.
- MAIN switch is pressed (Set speed will be cleared)
- CANCEL switch is pressed
- More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
- Brake pedal is depressed
- Selector lever is in N, P or R range
- Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
- VDC system is operated
- Actual vehicle speed decreased to approximately 30 km/h (18 MPH) or less
• When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking ASCD indicator.
- Engine coolant temperature is excessively higher than the normal operating temperature, ASCD indicator
may blink slowly.
(When the engine coolant temperature decreases to the normal operating temperature, ASCD indicator will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.)
- Malfunction for some self-diagnoses regarding ASCD control
(When ASCD is operating, all of ASCD operations will be canceled and vehicle speed memory will be
erased.)
ECO MODE SYSTEM
JSBIA5012GB
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