2008 NISSAN TEANA coolant temperature

EC-44
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
AIR CONDITIONING CUT CONTROL
AIR CONDITIONING CUT CONTROL
System DiagramINFOID:0000000003856473
System DescriptionINFOID:0000000003856474
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF.
 When the accelerator pedal is fully depressed.
 When cranking the engine.
 At high engine speeds.
 When the engine coolant temperature becomes excessively high.
 When operating power steering during low engine speed or low vehicle speed.
 When engine speed is excessively low.
 When refrigerant pressure is excessively low or high.
JMBIA1414GB
Sensor Input Signal to ECM ECM function Actuator
BCM
Air conditioner ON signal*
1
Air conditioner
cut controlAir conditioner relay Accelerator pedal position sensor Accelerator pedal position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)Engine speed*
2
Engine coolant temperature sensor Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
ABS actuator and electric unit (control unit)
Vehicle speed*
1

AIR CONDITIONING CUT CONTROL
EC-45
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Component Parts LocationINFOID:0000000003857773
1. Intake valve timing control solenoid
valve (bank 1)2. Intake valve timing control solenoid
valve (bank 2)3. Electronic controlled engine mount
control solenoid valve
4. Fuel injector (bank 2) 5. Cooling fan motor-2 6. A/F sensor 1 (bank 2)
7. Ignition coil (with power transistor)
and spark plug (bank 2)8. Camshaft position sensor (PHASE)
(bank 2)9. Crankshaft position sensor (POS)
10. Engine coolant temperature sensor 11. Cooling fan motor-1 12. ECM
13. Refrigerant pressure sensor 14. Battery current sensor 15. IPDM E/R
16. Mass air flow sensor (with intake air
temperature sensor)17. Electric throttle control actuator 18. Power valve actuator 2 (VQ35DE
models)
19. EVAP canister purge volume control
solenoid valve20. Camshaft position sensor (PHASE)
(bank 1)21. Ignition coil (with power transistor)
and spark plug (bank 1)
22. A/F sensor 1 (bank 1) 23. Fuel injector (bank 1) 24. VIAS control solenoid valve 1 and 2
(VQ35DE models)
25. Power valve actuator 1
JMBIA1373ZZ

EC-50
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
AIR CONDITIONING CUT CONTROL
Component Description
INFOID:0000000003856476
1. Fuel level sensor unit and fuel pump
harness connector2. Fuel pressure regulator 3. Fuel level sensor unit and fuel pump
: Vehicle front
JMBIA1385ZZ
Component Reference
Accelerator pedal position sensorEC-304, "
Description"
Camshaft position sensor (PHASE)EC-222, "Description"
Crankshaft position sensor (POS)EC-218, "Description"
Engine coolant temperature sensorEC-157, "Description"
Power steering pressure sensorEC-236, "Description"
Refrigerant pressure sensorEC-348, "Description"

EC-52
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
 Brake pedal is depressed
 Selector lever position is N, P or R
 Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
 TCS system is operated
 CVT control system has a malfunction. Refer to EC-280, "
Description".
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.
 Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.
 Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.
If MAIN switch is turned to OFF while ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.
COAST OPERATION
When the SET/COAST switch is pressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will maintain the new set speed.
RESUME OPERATION
When the RESUME/ACCELERATE switch is pressed after cancel operation other than pressing MAIN switch
is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must
meet following conditions.
 Brake pedal is released
 Selector lever position is other than P and N
 Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)

AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-53
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Component Parts LocationINFOID:0000000003857774
1. Intake valve timing control solenoid
valve (bank 1)2. Intake valve timing control solenoid
valve (bank 2)3. Electronic controlled engine mount
control solenoid valve
4. Fuel injector (bank 2) 5. Cooling fan motor-2 6. A/F sensor 1 (bank 2)
7. Ignition coil (with power transistor)
and spark plug (bank 2)8. Camshaft position sensor (PHASE)
(bank 2)9. Crankshaft position sensor (POS)
10. Engine coolant temperature sensor 11. Cooling fan motor-1 12. ECM
13. Refrigerant pressure sensor 14. Battery current sensor 15. IPDM E/R
16. Mass air flow sensor (with intake air
temperature sensor)17. Electric throttle control actuator 18. Power valve actuator 2 (VQ35DE
models)
19. EVAP canister purge volume control
solenoid valve20. Camshaft position sensor (PHASE)
(bank 1)21. Ignition coil (with power transistor)
and spark plug (bank 1)
22. A/F sensor 1 (bank 1) 23. Fuel injector (bank 1) 24. VIAS control solenoid valve 1 and 2
(VQ35DE models)
25. Power valve actuator 1
JMBIA1373ZZ

EC-60
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
COOLING FAN CONTROL
COOLING FAN CONTROL
System DiagramINFOID:0000000003856482
System DescriptionINFOID: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
controlIPDM 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

EC-62
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
COOLING FAN CONTROL
Component Parts Location
INFOID:0000000003857775
1. Intake valve timing control solenoid
valve (bank 1)2. Intake valve timing control solenoid
valve (bank 2)3. Electronic controlled engine mount
control solenoid valve
4. Fuel injector (bank 2) 5. Cooling fan motor-2 6. A/F sensor 1 (bank 2)
7. Ignition coil (with power transistor)
and spark plug (bank 2)8. Camshaft position sensor (PHASE)
(bank 2)9. Crankshaft position sensor (POS)
10. Engine coolant temperature sensor 11. Cooling fan motor-1 12. ECM
13. Refrigerant pressure sensor 14. Battery current sensor 15. IPDM E/R
16. Mass air flow sensor (with intake air
temperature sensor)17. Electric throttle control actuator 18. Power valve actuator 2 (VQ35DE
models)
19. EVAP canister purge volume control
solenoid valve20. Camshaft position sensor (PHASE)
(bank 1)21. Ignition coil (with power transistor)
and spark plug (bank 1)
22. A/F sensor 1 (bank 1) 23. Fuel injector (bank 1) 24. VIAS control solenoid valve 1 and 2
(VQ35DE models)
25. Power valve actuator 1
JMBIA1373ZZ

COOLING FAN CONTROL
EC-67
< FUNCTION DIAGNOSIS >[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Component DescriptionINFOID:0000000003856485
1. Fuel level sensor unit and fuel pump
harness connector2. Fuel pressure regulator 3. Fuel level sensor unit and fuel pump
: Vehicle front
JMBIA1385ZZ
Component Reference
Camshaft position sensor (PHASE)EC-222, "
Description"
Crankshaft position sensor (POS)EC-218, "Description"
Cooling fan motorEC-324, "Description"
Engine coolant temperature sensorEC-157, "Description"
Refrigerant pressure sensorEC-348, "Description"