Nissan Altima L32. Instruction — part 373
COOLING FAN CONTROL
EC-613
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
COOLING FAN CONTROL
System Diagram
INFOID:0000000004349621
System Description
INFOID:0000000004349622
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
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pres-
sure, air conditioner ON signal. Then control system has 4-step control [HIGH/MIDDLE/LOW/OFF].
JMBIA0177GB
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
Combination meter
Vehicle speed*
2
Engine coolant temperature sensor
Engine coolant temperature
BCM
Air conditioner ON signal*
2
Refrigerant pressure sensor
Refrigerant pressure
EC-614
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
COOLING FAN CONTROL
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays through CAN communication line.
JMBIA1928GB
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-615
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Component Parts Location
INFOID:0000000004349623
1.
Intake valve timing control solenoid
valve
2.
Ignition coil (with power transistor)
and spark plug
3.
Knock sensor,
Crankshaft position sensor (POS)
4.
Air fuel ratio (A/F) sensor 1
5.
Camshaft position sensor (PHASE)
6.
Engine coolant temperature sensor
7.
Park/neutral position (PNP) switch
8.
ECM
9.
Refrigerant pressure sensor
10. Battery current sensor
11. IPDM E/R
12. Mass air flow sensor (with intake
temperature sensor)
13. EVAP service port
14. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
15. EVAP canister purge volume control
solenoid valve
16. Fuel injector
17. Power steering pressure sensor
ALBIA0094ZZ
EC-616
< FUNCTION DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
COOLING FAN CONTROL
1.
Battery
2.
Fuel pump fuse (15A)
3.
IPDM E/R
4.
Brake master cylinder
5.
Engine ground
6.
Air cleaner assembly
7.
Mass air flow sensor (with intake air
temperature sensor)
8.
Radiator hose (upper)
9.
Engine coolant temperature sensor
10. Intake air duct
11. Camshaft position sensor (PHASE)
12. Tie rod (RH)
13. Power steering pressure sensor
14. Knock sensor
15. Engine oil cooler
16. Crankshaft position sensor (POS)
17. Drive shaft (RH)
: Vehicle front
ALBIA0091ZZ
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