Nissan Primera P12. Manual — part 294
ENGINE CONTROL SYSTEM
EC-361
[YD (WITHOUT EURO-OBD)]
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EC
Vacuum Hose Drawing
EBS0152T
Refer to
for Vacuum Control System.
MBIB0609E
EC-362
[YD (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
System Chart
EBS0152U
*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 System
EBS0152V
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
●
ASCD steering switch
●
ASCD brake switch
●
ASCD clutch switch
●
Stop lamp switch
●
Air conditioner switch*
1
●
Park/neutral position switch
●
Battery voltage
●
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
ASCD vehicle speed control
Fuel injector and Fuel pump
On board diagnostic system
Malfunction indicator (MI)*
2
EGR volume control
EGR volume control valve
Cooling fan control
Cooling fan relay
Turbocharger boost control
Turbocharger boost control solenoid
valve
Air conditioning cut control
Air conditioner relay*
2
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
ENGINE CONTROL SYSTEM
EC-363
[YD (WITHOUT EURO-OBD)]
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EC
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
EC-364
[YD (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
DECELERATION CONTROL
Input/Output Signal Chart
The ECM sends a fuel cut signal to the fuel injectors and fuel pump during deceleration for better fuel effi-
ciency. The ECM determines the time of deceleration according to signals from the accelerator pedal position
sensor and crankshaft position sensor.
Fuel Injection Timing Control System
EBS0152W
DESCRIPTION
The target fuel injection timing in accordance with the engine speed and the fuel injection amount are recorded
as a map in the ECM beforehand. The ECM determines the optimum injection timing using sensor signals
accordance with the map.
Air Conditioning Cut Control
EBS0152X
INPUT / OUTPUT SIGNAL CHART
*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.
SYSTEM DESCRIPTION
This system improves acceleration when the air conditioner is used.
When the accelerator pedal is fully depressed, the air conditioner is turned off for a few seconds.
When engine coolant temperature becomes excessively high, the air conditioner is turned off. This continues
until the engine coolant temperature returns to normal.
Fuel Cut Control (At No Load & High Engine Speed)
EBS0152Y
INPUT/OUTPUT SIGNAL CHART
*: The input signal is sent to the ECM through CAN communication line.
If the engine speed is above 2,800 rpm under no load (for example, the shift position is neutral and engine
speed is over 2,800 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-362, "Fuel Injection Control Sys-
.
Sensor
Input Signal to ECM
ECM Function
Actuator
Accelerator pedal position sensor
Accelerator pedal position
Fuel injection
control (Decel-
eration control)
Fuel injector
Fuel pump
Crankshaft position sensor
Engine speed
Sensor
Input Signal to ECM
ECM Function
Actuator
Air conditioner switch*
1
Air conditioner ON signal
Air conditioner
cut control
Air conditioner relay*
2
Accelerator pedal position sensor
Accelerator pedal opening angle
Vehicle speed sensor*
1
Vehicle speed
Engine coolant temperature sensor
Engine coolant temperature
Sensor
Input Signal to ECM
ECM Function
Actuator
Vehicle speed sensor*
Vehicle speed
Fuel cut control
Fuel injector
Accelerator pedal position sensor
Accelerator pedal position
Crankshaft position sensor
Engine speed
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