Nissan Primera P12. Instruction — part 209
ENGINE CONTROL SYSTEM
EC-21
[YD (WITH EURO-OBD)]
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EC
ENGINE CONTROL SYSTEM
PFP:23710
System Diagram
EBS013J2
MBIB0608E
EC-22
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM
Vacuum Hose Drawing
EBS013J3
Refer to
for Vacuum Control System.
MBIB0609E
ENGINE CONTROL SYSTEM
EC-23
[YD (WITH EURO-OBD)]
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EC
System Chart
EBS013J4
*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
EBS013J5
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
EC-24
[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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