Nissan Maxima. Manual — part 398
EC-76
< SYSTEM DESCRIPTION >
[VQ35DE]
CAN COMMUNICATION
CAN COMMUNICATION
System Description
INFOID:0000000010094817
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-7, "CAN Communication Control Circuit"
, about CAN communication for detail.
COOLING FAN CONTROL
EC-77
< SYSTEM DESCRIPTION >
[VQ35DE]
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COOLING FAN CONTROL
System Diagram
INFOID:0000000010094818
System Description
INFOID:0000000010094819
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].
JMBIA1905GB
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
Engine coolant temperature sensor
Engine coolant temperature
Refrigerant pressure sensor
Refrigerant pressure
Unified meter and A/C amp.
Air conditioner ON signal*
2
Vehicle speed*
2
EC-78
< SYSTEM DESCRIPTION >
[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
COOLING FAN CONTROL
EC-79
< SYSTEM DESCRIPTION >
[VQ35DE]
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Component Parts Location
INFOID:0000000010094820
1.
Intake valve timing control solenoid
valve (bank 1)
2.
Electronic controlled engine mount
control solenoid valve
3.
Exhaust valve timing control magnet
retarder (bank 2)
4.
Intake valve timing control solenoid
valve (bank 2)
5.
Knock sensor (bank 1 and 2)
6.
Fuel injector (bank 2)
7.
Ignition coil (with power transistor) and
spark plug (bank 2)
8.
Exhaust valve timing control position
sensor (bank 2)
9.
Crankshaft position sensor (POS)
10. Engine coolant temperature sensor
11. Camshaft position sensor (PHASE)
(bank 2)
12. Transmission range switch
13. Refrigerant pressure sensor
14. ECM
15. Battery current sensor
16. Condenser-2
17. EVAP canister purge volume control
solenoid valve
18. Mass air flow sensor (with intake air
temperature sensor)
19. Camshaft position sensor (PHASE)
(bank 1)
20. EVAP service port
21. Power valve actuator 2
22. Electric throttle control actuator
23. Exhaust valve timing control position
sensor (bank 1)
24. Ignition coil (with power transistor) and
spark plug (bank 1)
25. Fuel injector (bank 1)
26. VIAS control solenoid valve 1 and 2
27. Power valve actuator 1
28. Exhaust valve timing control magnet
retarder (bank 1)
29. Power steering pressure sensor
ALBIA0603ZZ
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