2003 NISSAN X-TRAIL Service Repair Manual

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Page 1257 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual PRECAUTIONS
EC-879
[YD (WITH EURO-OBD)]
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EC

Do not disassemble ECM.
When connecting ECM harness connector, fasten it
securely with levers as far as they will go as shown in t

Page 1258 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-880
[YD (WITH EURO-OBD)]
PRECAUTIONS

After performing each TROUBLE DIAGNOSIS, perform DTC
Confirmation Procedure or Overall Function Check.
The DTC should not be displayed in the DTC Confirmatio

Page 1259 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual PRECAUTIONS
EC-881
[YD (WITH EURO-OBD)]
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Wiring Diagrams and Trouble DiagnosisEBS0116S
When you read Wiring diagrams, refer to the following:
GI-14, "How to Read Wiring Dia

Page 1260 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-882
[YD (WITH EURO-OBD)]
PREPARATION

PREPARATIONPFP:00002
Special Service ToolsEBS011T9
Commercial Service ToolsEBS011TA
Tool number
Tool nameDescription
EG17650301
Radiator cap tester
adapterAd

Page 1261 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual ENGINE CONTROL SYSTEM
EC-883
[YD (WITH EURO-OBD)]
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ENGINE CONTROL SYSTEMPFP:23710
System DiagramEBS0116T
PBIB2018E

Page 1262 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-884
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

Vacuum Hose DrawingEBS0116U
Refer to EC-883, "System Diagram" for Vacuum Control System.
PBIB2019E

Page 1263 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual ENGINE CONTROL SYSTEM
EC-885
[YD (WITH EURO-OBD)]
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System ChartEBS0116V
*1: The input signal is sent to the ECM through CAN communication line.
*2: The output signal is sent

ENGINE CONTROL SYSTEM
EC-885
[YD (WITH EURO-OBD)]
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System ChartEBS0116V
*1: The input signal is sent to the ECM through CAN communication line.
*2: The output signal is sent from the ECM through CAN communication line.
Fuel Injection Control SystemEBS0116W
SYSTEM DESCRIPTION
Three types of fuel injection control are provided to accommodate engine operating conditions; normal control,
idle control and start control. The ECM determines the appropriate fuel injection control. Under each control,
the amount of fuel injected is adjusted to improve engine performance.
Pulse signals are sent to fuel injectors according to the input signals to adjust the amount of fuel injected to
preset value.
START CONTROL
Input/Output Signal Chart
When the ECM receives a start signal from the ignition switch, the
ECM adapts the fuel injection system for the start control. The
amount of fuel injected at engine starting is a preset program value
in the ECM. The program is determined by the engine speed, engine
coolant temperature and fuel rail pressure.
For better startability under cool engine conditions, the lower the
coolant temperature becomes, the greater the amount of fuel
injected. The ECM ends the start control when the engine speed
reaches the specific value, and shifts the control to the normal or idle
control.
Input (Sensor) ECM Function Output (Actuator)
Accelerator pedal position sensor
Fuel rail pressure sensor
Fuel pump temperature sensor
Engine coolant temperature sensor
Mass air flow sensor
Intake air temperature sensor
Crankshaft position sensor
Camshaft position sensor
Turbocharger boost sensor
Vehicle speed sensor*1
ESP/TCS/ABS control unit*1
Ignition switch
Stop lamp switch
Air conditioner switch*1
Park/neutral position switch
Battery voltage
Fuel level switch
Power steering pressure switch Fuel injection control Fuel injector and Fuel pump
Fuel injection timing control Fuel injector and Fuel pump
Fuel cut control Fuel injector and Fuel pump
Glow control system
Glow relay and glow indicator lamp*
2
On board diagnostic system
Malfunction indicator (MI)*2
EGR volume control EGR volume control valve
Cooling fan control Cooling fan relay
Turbocharger boost controlTurbocharger boost control solenoid
valve
Fuel transport pump control Fuel transport pump relay
Air conditioning cut control Air conditioner relay
Sensor Input Signal to ECM ECM Function Actuator
Engine coolant temperature sensor Engine coolant temperature
Fuel injection
control (start
control)Fuel injector
Fuel pump Crankshaft position sensor Engine speed
Camshaft position sensor Piston position
Ignition switch Start signal
Fuel rail pressure sensor Fuel rail pressure
SEF648S

Page 1264 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-886
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

IDLE CONTROL
Input/Output Signal Chart
*: The input signal is sent to the ECM through CAN communication line.
When the ECM determines that the engin

EC-886
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM

IDLE CONTROL
Input/Output Signal Chart
*: The input signal is sent to the ECM through CAN communication line.
When the ECM determines that the engine speed is at idle, the fuel injection system is adapted for the idle
control. The ECM regulates the amount of fuel injected corresponding to changes in load applied to the engine
to keep engine speed constant. The ECM also provides the system with a fast idle control in response to the
engine coolant temperature signal.
NORMAL CONTROL
Input/Output Signal Chart
The amount of fuel injected under normal driving conditions is deter-
mined according to sensor signals. The crankshaft position sensor
detects engine speed, the accelerator pedal position sensor detects
accelerator pedal position and fuel rail pressure sensor detects fuel
rail pressure. These sensors send signals to the ECM.
The fuel injection data, predetermined by correlation between vari-
ous engine speeds, accelerator pedal positions and fuel rail pres-
sure are stored in the ECM memory, forming a map. The ECM
determines the optimal amount of fuel to be injected using the sen-
sor signals in comparison with the map.
MAXIMUM AMOUNT CONTROL
Input/Output Signal Chart
The maximum injection amount is controlled to an optimum by the engine speed, intake air amount, engine
coolant temperature, and accelerator opening in accordance with the driving conditions.
This prevents the oversupply of the injection amount caused by decreased air density at a high altitude or dur-
ing a system failure.
Sensor Input Signal to ECM ECM Function Actuator
Engine coolant temperature sensor Engine coolant temperature
Fuel injection
control (Idle
control)Fuel injector
Fuel pump Crankshaft position sensor Engine speed
Battery Battery voltage
Accelerator pedal position sensor Accelerator pedal position
Fuel rail pressure sensor Fuel rail pressure
Vehicle speed sensor* Vehicle speed
Air conditioner switch* Air conditioner signal
Sensor Input Signal to ECM ECM Function Actuator
Crankshaft position sensor Engine speed
Fuel injection
control (Nor-
mal control)Fuel injector
Fuel pump Accelerator pedal position sensor Accelerator position
Fuel rail pressure sensor Fuel rail pressure
SEF649S
Sensor Input Signal to ECM ECM Function Actuator
Mass air flow sensor Amount of intake air
Fuel injection
control (Maxi-
mum amount
control)Fuel Injector Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor Engine speed
Accelerator pedal position sensor Accelerator pedal position

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