2005 NISSAN X-TRAIL Service Repair Manual

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Page 441 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual ENGINE CONTROL SYSTEM
EC-37
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FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each

ENGINE CONTROL SYSTEM
EC-37
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FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
Electronic Ignition (EI) SystemEBS010LA
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The ignition timing is controlled by the ECM to maintain the best air-
fuel ratio for every running condition of the engine. The ignition tim-
ing data is stored in the ECM. This data forms the map shown.
The ECM receives information such as the injection pulse width and
camshaft position sensor signal. Computing this information, ignition
signals are transmitted to the power transistor.
e.g., N: 1,800 rpm, Tp: 1.50 msec
A °BTDC
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
SEF337W
Sensor Input Signal to ECMECM func-
tionActuator
Crankshaft position sensor (POS)
Engine speed*
2
piston position
Ignition
timing con-
trolPower transistor Camshaft position sensor (PHASE)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Knock sensor Engine knocking
Park/neutral position (PNP) switch Gear position
Battery
Battery voltage*
2
Wheel sensor*1Vehicle speed
SEF742M

Page 442 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual EC-38
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ENGINE CONTROL SYSTEM

At idle
At low battery voltage
During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is p

EC-38
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ENGINE CONTROL SYSTEM

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.
Air Conditioning Cut ControlEBS010LB
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
When the accelerator pedal is fully depressed.
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.
Fuel Cut Control (at No Load and High Engine Speed)EBS010LC
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine
speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under EC-35, "
Multiport Fuel Injection (MFI) System" .
Sensor Input Signal to ECM ECM function Actuator
Air conditioner switch Air conditioner ON signal
Air conditioner
cut controlAir conditioner relay Throttle position sensor Throttle valve opening angle
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
2
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
Wheel sensor*
1Vehicle speed
Sensor Input Signal to ECM ECM function Actuator
Park/neutral position (PNP) switch Neutral position
Fuel cut control Fuel injector Accelerator pedal position sensor Accelerator pedal position
Engine coolant temperature sensor Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed
Wheel sensor* Vehicle speed

Page 443 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual ENGINE CONTROL SYSTEM
EC-39
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CAN Communication UnitEBS010LD
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real tim

Page 444 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual EC-40
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ENGINE CONTROL SYSTEM

TYPE 3
System Diagram
Input/output Signal Chart
T: Transmit R: Receive Accelerator pedal position signal T R
Engine coolant temperature signal T R

Page 445 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual ENGINE CONTROL SYSTEM
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TYPE 5
System Diagram
Input/output Signal Chart
T: Transmit R: Receive Engine coolant temperature signal TR
Engine speed

Page 446 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual EC-42
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ENGINE CONTROL SYSTEM

TYPE 6
System Diagram
Input/output Signal Chart
T: Transmit R: Receive Engine speed signal T R R R
ESP OFF indicator lamp signal T R
MI signal TR
S

Page 447 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual ENGINE CONTROL SYSTEM
EC-43
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TYPE 7
System diagram
Input/output signal chart
T: Transmit R: Receive Engine coolant temperature signal TR
Engine speed

Page 448 of 4555

NISSAN X-TRAIL 2005 Service Repair Manual EC-44
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ENGINE CONTROL SYSTEM

Vehicle speed signalTR
RT
ASCD SET lamp signal T R
ASCD CRUISE lamp signal T R
Stop lamp switch signal T RSignals ECM ABS actuator and electric unit

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