Nissan Teana J32. Instruction — part 380
EC-58
< FUNCTION DIAGNOSIS >
[VQ25DE, VQ35DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
Component Description
INFOID:0000000003856480
1.
Fuel level sensor unit and fuel pump
harness connector
2.
Fuel pressure regulator
3.
Fuel level sensor unit and fuel pump
: Vehicle front
JMBIA1385ZZ
Component
Reference
ASCD steering switch
ASCD brake switch
ASCD clutch switch
Stop lamp switch
Electric throttle control actuator
ASCD indicator
CAN COMMUNICATION
EC-59
< FUNCTION DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
CAN COMMUNICATION
System Description
INFOID:0000000003856481
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-22, "CAN System Specification Chart"
, about CAN communication for detail.
EC-60
< FUNCTION DIAGNOSIS >
[VQ25DE, VQ35DE]
COOLING FAN CONTROL
COOLING FAN CONTROL
System Diagram
INFOID:0000000003856482
System Description
INFOID:0000000003856483
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
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 4-step control [HIGH/MIDDLE/LOW/OFF].
JMBIA1324GB
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 relay
↓
Cooling fan motor
Battery
Battery voltage*
1
ABS actuator and electric unit (control unit)
Vehicle speed*
2
Engine coolant temperature sensor
Engine coolant temperature
BCM
Air conditioner ON signal*
2
Refrigerant pressure sensor
Refrigerant pressure
COOLING FAN CONTROL
EC-61
< FUNCTION DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R through CAN communication line.
JMBIA0179GB
Cooling fan speed
Cooling fan relay
1
2
3
Stop (OFF)
OFF
OFF
OFF
Low (LOW)
ON
OFF
OFF
Middle (MID)
OFF
ON
OFF
High (HI)
OFF
ON
ON
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