Nissan Primera P12. Manual — part 210
ENGINE CONTROL SYSTEM
EC-25
[YD (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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
EBS013J6
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
EBS013J7
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)
EBS013J8
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-23, "Fuel Injection Control System"
.
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
EC-26
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM
Crankcase Ventilation System
EBS013J9
DESCRIPTION
In this system, blow-by gas is sucked into the air duct after oil separation by oil separator in the rocker cover.
INSPECTION
Ventilation Hose
1.
Check hoses and hose connections for leaks.
2.
Disconnect all hoses and clean with compressed air. If any hose
cannot be freed of obstructions, replace.
CAN Communication
EBS013JA
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
PBIB0590E
SEC692
ENGINE CONTROL SYSTEM
EC-27
[YD (WITH EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
MODELS WITH ESP
System Diagram
●
LHD models
●
RHD models
Input/Output Signal Chart
T: Transmit R: Receive
SKIA1524E
SKIA1538E
Signals
ECM
ESP/ TCS /
ABS control
unit
Steering
angle sensor
Smart
entrance
control unit
Tyre pres-
sure monitor-
ing control
unit
Combination
meter
Engine speed signal
T
R
R
Accelerator pedal position signal
T
R
Steering angle sensor signal
R
T
Air conditioner switch signal
R
T
MI signal
T
R
Glow indicator lamp signal
T
R
Engine coolant temperature signal
T
R
Fuel consumption signal
T
R
Vehicle speed signal
T
R
R
R
T
Seat belt reminder signal
R
T
Lighting switch position signal
T
R
Flashing indicator signal
T
R
Engine cooling fan speed signal
T
R
Child lock indicator signal
T
R
Door switches state signal
T
R
A/C compressor signal
T
R
Tyre pressure signal
T
R
ASCD SET lamp signal
T
R
ASCD CRUISE lamp signal
T
R
EC-28
[YD (WITH EURO-OBD)]
ENGINE CONTROL SYSTEM
MODELS WITHOUT ESP
System Diagram
●
LHD models
●
RHD models
Input/Output Signal Chart
T: Transmit R: Receive
SKIA1525E
SKIA1539E
Signals
ECM
ABS actuator
and electric
unit (control
unit)
Smart entrance
control unit
Tyre pressure
monitoring
control unit
Combination
meter
Engine speed signal
T
R
Air conditioner switch signal
R
T
MI signal
T
R
Glow indicator lamp signal
T
R
Engine coolant temperature signal
T
R
Fuel consumption signal
T
R
Vehicle speed signal
T
R
R
R
T
Seat belt reminder signal
R
T
Lighting switch position signal
T
R
Flashing indicator signal
T
R
Engine cooling fan speed signal
T
R
Child lock indicator signal
T
R
Door switches state signal
T
R
A/C compressor signal
T
R
Tyre pressure signal
T
R
ASCD SET lamp signal
T
R
ASCD CRUISE lamp signal
T
R
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