Nissan Altima L32. Instruction — part 494
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-1097
< FUNCTION DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Component Description
INFOID:0000000004361980
1.
ASCD brake switch
2.
Stop lamp switch
3.
Brake pedal
4.
ASCD steering switch
5.
ASCD clutch switch (M/T models)
6.
Clutch pedal
ALBIA0105ZZ
Component
Reference
ASCD brake switch
ASCD clutch switch
ASCD indicator
ASCD steering switch
Electric throttle control actuator
Park/neutral position (PNP) switch (M/T)
Stop lamp switch
TCM (CVT)
EC-1098
< FUNCTION DIAGNOSIS >
[VQ35DE]
CAN COMMUNICATION
CAN COMMUNICATION
System Description
INFOID:0000000004361981
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.
LAN-25, "CAN Communication Signal Chart"
, about CAN communication for detail.
COOLING FAN CONTROL
EC-1099
< FUNCTION DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
COOLING FAN CONTROL
System Diagram
INFOID:0000000004361982
System Description
INFOID:0000000004361983
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 via the 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].
JMBIA1969GB
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
Engine coolant temperature sensor
Engine coolant temperature
Refrigerant pressure sensor
Refrigerant pressure
Battery
Battery voltage*
1
Unified meter and A/C amp.
Air conditioner ON signal*
2
Vehicle speed*
2
EC-1100
< FUNCTION DIAGNOSIS >
[VQ35DE]
COOLING FAN CONTROL
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R via the 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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