Nissan Versa Sedan. Manual — part 260
SYSTEM
EC-39
< SYSTEM DESCRIPTION >
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CAN COMMUNICATION
CAN COMMUNICATION : System Description
INFOID:0000000009266996
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.
Refer to
LAN-29, "CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart"
munication for detail.
COOLING FAN CONTROL
COOLING FAN CONTROL : System Diagram
INFOID:0000000009266997
COOLING FAN CONTROL : System Description
INFOID:0000000009266998
INPUT/OUTPUT SIGNAL CHART
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.
SYSTEM DESCRIPTION (EXCEPT FOR SINGLE CONNECTOR COOLING FAN WITHOUT A/C)
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].
JSBIA0321GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
*1
Piston position
Cooling fan speed request
signal
IPDM E/R
↓
Cooling fan relay
↓
Cooling fan motor
Engine coolant temperature sensor
Engine coolant temperature
Refrigerant pressure sensor
Refrigerant pressure
Battery
Battery voltage
*1
Combination meter
Vehicle speed
*2
BCM
A/C ON signal
*2
Blower fan signal
*2
EC-40
< SYSTEM DESCRIPTION >
[HR16DE]
SYSTEM
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays through CAN communication line.
SYSTEM DESCRIPTION (FOR SINGLE CONNECTOR COOLING FAN WITHOUT A/C)
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 2-step control [HIGH/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays through CAN communication line.
EVAPORATIVE EMISSION SYSTEM
PBIB2483E
Cooling fan speed
Cooling fan low relay
Cooling fan high relay
Cooling fan relay
Stop (OFF)
OFF
OFF
OFF
Low (LOW)
ON
OFF
OFF
High (HI)
ON
ON
ON
JSBIA1323GB
Cooling fan speed
Cooling fan relay
Stop (OFF)
OFF
Operate (HI)
ON
SYSTEM
EC-41
< SYSTEM DESCRIPTION >
[HR16DE]
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EVAPORATIVE EMISSION SYSTEM : System Diagram
INFOID:0000000009266999
EVAPORATIVE EMISSION SYSTEM : System Description
INFOID:0000000009267000
INPUT/OUTPUT SIGNAL CHART
*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.
JPBIA4896GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
1
Piston position
EVAP canister purge
flow control
EVAP canister purge volume
control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Air fuel ratio (A/F) sensor 1
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Battery
Battery voltage*
1
Fuel tank temperature sensor
Fuel temperature in fuel tank
EVAP control system pressure sensor
Pressure in purge line
Combination meter
Vehicle speed*
2
EC-42
< SYSTEM DESCRIPTION >
[HR16DE]
SYSTEM
SYSTEM DESCRIPTION
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the
engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is
proportionally regulated as the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating.
INTAKE VALVE TIMING CONTROL
INTAKE VALVE TIMING CONTROL : System Diagram
INFOID:0000000009267001
INTAKE VALVE TIMING CONTROL : System Description
INFOID:0000000009267002
INPUT/OUTPUT SIGNAL CHART
PBIB3639E
JPBIA4760GB
Sensor
Input signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed
*1
Piston position
Intake valve timing
control
Intake valve timing control
solenoid valve
Camshaft position sensor (PHASE)
Engine oil temperature sensor
Engine oil temperature
Engine coolant temperature sensor
Engine coolant temperature
Combination meter
Vehicle speed
*2
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