Nissan Frontier D40. Manual — part 450
CAN COMMUNICATION
EC-491
< FUNCTION DIAGNOSIS >
[VQ40DE]
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CAN COMMUNICATION
System Description
INFOID:0000000005273479
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-48, "CAN System Specification Chart"
, about CAN communication for detail.
EC-492
< FUNCTION DIAGNOSIS >
[VQ40DE]
COOLING FAN CONTROL
COOLING FAN CONTROL
Description
INFOID:0000000005273480
SYSTEM DESCRIPTION
Cooling Fan Control
*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM via the CAN communication line.
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
1
Cooling fan
control
IPDM E/R
(Cooling fan relays)
Battery
Battery voltage*
1
Wheel sensor
Vehicle speed*
2
Engine coolant temperature sensor
Engine coolant temperature
Air conditioner switch
Air conditioner ON signal*
2
Refrigerant pressure sensor
Refrigerant pressure
PBIB2531E
Cooling fan speed
Cooling fan relay
LO
HI
Stop (OFF)
OFF
OFF
Low (LOW)
ON
OFF
High (HI)
ON
ON
EVAPORATIVE EMISSION SYSTEM
EC-493
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[VQ40DE]
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EVAPORATIVE EMISSION SYSTEM
Description
INFOID:0000000005273481
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 saved 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.
PBIB3639E
EC-494
< FUNCTION DIAGNOSIS >
[VQ40DE]
EVAPORATIVE EMISSION SYSTEM
EVAPORATIVE EMISSION LINE DRAWING
PBIB2528E
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