Nissan X-Trail 32. Manual — part 728
COMPONENT PARTS
EC-41
< SYSTEM DESCRIPTION >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Refrigerant Pressure Sensor
INFOID:0000000010775028
The refrigerant pressure sensor is installed at the liquid tank of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.
Stop Lamp Switch and Brake pedal position switch
INFOID:0000000010775029
Stop lamp switch and brake pedal position switch are installed to brake pedal bracket.
ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).
Clutch Pedal Position Switch
INFOID:0000000010775030
Clutch pedal position switch are installed to clutch pedal bracket.
ECM detects the state of the clutch pedal by those two types of input signal (ON/OFF).
ASCD Steering Switch
INFOID:0000000010775031
ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.
JSBIA5008GB
Brake pedal
Brake pedal position switch
Stop lamp switch
Released
ON
OFF
Depressed
OFF
ON
Clutch pedal
Clutch pedal position switch
Released
ON
Depressed
OFF
EC-42
< SYSTEM DESCRIPTION >
[MR20DD]
STRUCTURE AND OPERATION
STRUCTURE AND OPERATION
Positive Crankcase Ventilation
INFOID:0000000010775033
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 intakemanifold.
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 drawn from
the air inlet tubes into the crankcase. In this process the air passes
throughthe 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 con-
nection in the reverse direction.
PBIB2962E
PBIB1588E
SYSTEM
EC-43
< SYSTEM DESCRIPTION >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
SYSTEM
ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM : System Description
INFOID:0000000010775034
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
JSBIA5005GB
EC-44
< SYSTEM DESCRIPTION >
[MR20DD]
SYSTEM
• The adopted system enables comprehensive engine control. ECM (engine control module) performs various
controls such as fuel injection control, ignition timing control, idling engine speed control, EVAP purge con-
trol and etc., and this system communicates with control unit such as CVT, ABS, etc. via CAN communica-
tion line.
• The adopted diagnostic system corresponding to OBD (on board diagnostic) system enables various func-
tion check and easily malfunction diagnosis in the engine control system.
ENGINE CONTROL SYSTEM : Fail-safe
INFOID:0000000010775035
NON DTC RELATED ITEM
DTC RELATED ITEM
Description
Function
Reference
Fuel injection control
EC-51, "DIG (DIRECT INJECTION GASOLINE) SYSTEM :
System Description"
Fuel pressure control
EC-54, "FUEL PRESSURE CONTROL : System Description"
Electric ignition control
EC-55, "ELECTRIC IGNITION SYSTEM : System Descrip-
tion"
Idling control
EC-56, "IDLE SPEED CONTROL : System Description"
Cooling fan control
EC-57, "COOLING FAN CONTROL : System Description"
Intake valve timing control
EC-58, "INTAKE VALVE TIMING CONTROL : System De-
scription"
Exhaust valve timing control
EC-59, "EXHAUST VALVE TIMING CONTROL : System De-
scription"
Intake manifold runner control valve control
EC-61, "INTAKE MANIFOLD RUNNER CONTROL : System
Description"
Engine protection control (Low engine oil pressure)
EC-62, "ENGINE PROTECTION CONTROL AT LOW EN-
GINE OIL PRESSURE : System Description"
Air conditioning cut control
EC-63, "AIR CONDITIONING CUT CONTROL : System De-
scription"
ASCD (Automatic speed control device)
EC-64, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) :
System Description"
ECO mode control
EC-65, "ECO MODE SYSTEM : System Description"
Engine/CVT/ABS total control
EC-65, "INTEGRATED CONTROL OF ENGINE, CVT, AND
ABS : System Description"
EVAP purge control
EC-66, "EVAPORATIVE EMISSION SYSTEM : System De-
scription"
Power generation voltage variable control
EC-66, "POWER GENERATION VOLTAGE VARIABLE CON-
TROL SYSTEM : System Description"
Fail-safe function
On board diagnostic (OBD) system
EC-71, "Diagnosis Description"
Detected
items
Engine operating condition in
fail-safe mode
Remarks
Malfunction
indicator lamp
circuit
Engine speed will not rise more
than 2,500 rpm due to the fuel
cut
When there is an open circuit on MIL circuit, the ECM cannot warn the driver by
lighting up MIL when there is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are
continuously detected as NG for 5 trips, ECM warns the driver that engine control
system malfunctions and MIL circuit is open by means of operating fail safe func-
tion.
The fail safe function also operates when above diagnoses except MIL circuit are
detected and demands the driver to repair the malfunction.
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