2007 NISSAN TIIDA Cooling

AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-731
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1. Mass air flow sensor
(with intake air temperature sensor)2. Engine coolant temperature sensor 3. Electric throttle control actuator
(with built in throttle position sensor,
throttle control motor)
4. PCV valve 5. Cooling fan motor 6. Resistor
7. Refrigerant pressure sensor
BBIA0724E

COOLING FAN CONTROL
EC-737
< FUNCTION DIAGNOSIS >[MR18DE]
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COOLING FAN CONTROL
System DiagramINFOID:0000000001161740
System DescriptionINFOID:0000000001161741
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 3-step control [HIGH/LOW/OFF].
Cooling Fan Operation
JMBIA0177GB
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
Combination meter
Vehicle speed*2
Engine coolant temperature sensor Engine coolant temperature
BCM
Air conditioner ON signal*
2
Refrigerant pressure sensor Refrigerant pressure

EC-738
< FUNCTION DIAGNOSIS >[MR18DE]
COOLING FAN CONTROL
Models with A/C
Models without A/C
Cooling Fan Relay Operation
The ECM controls cooling fan relays through CAN communication line.
PBIB2483E
PBIB3335E
Cooling fan speedCooling fan relay
123
Stop (OFF) OFF OFF OFF
Low (LOW) ON OFF OFF
High (HI) OFF ON ON

COOLING FAN CONTROL
EC-739
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Component Parts LocationINFOID:0000000001603914
1. Ignition coil (with power transistor)
and spark plug2. Intake valve timing control solenoid
valve3. Refrigerant pressure sensor
4. Knock sensor 5. Fuel injector 6. Cooling fan motor
7. Camshaft position sensor (PHASE) 8. IPDM E/R 9. ECM
10. Mass air flow sensor (with intake
temperature sensor)11. Engine coolant temperature sensor 12. Electric throttle control actuator
(with built in throttle position sensor
and throttle control motor)
13. EVAP canister purge volume control
solenoid valve
PBIB3261E

EC-740
< FUNCTION DIAGNOSIS >[MR18DE]
COOLING FAN CONTROL
1. Mass air flow sensor
(with intake air temperature sensor)2. Engine coolant temperature sensor 3. Electric throttle control actuator
(with built in throttle position sensor,
throttle control motor)
4. PCV valve 5. Cooling fan motor 6. Resistor
7. Refrigerant pressure sensor
BBIA0724E

COOLING FAN CONTROL
EC-741
< FUNCTION DIAGNOSIS >[MR18DE]
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1. Intake valve timing control solenoid
valve2. Knock sensor 3. IPDM E/R
4. Fuel pump fuse 5. Fuel level sensor unit and fuel pump
harness connector
(view with inspection hole cover re-
moved)6. Fuel level sensor unit and fuel pump
7. Fuel pressure regulator 8. Fuel level sensor 9. Fuel tank temperature sensor
10. Ignition coil 11. Fuel injector
BBIA0735E

EC-742
< FUNCTION DIAGNOSIS >[MR18DE]
COOLING FAN CONTROL
1. Heated oxygen sensor 1 2. Three way catalyst (Manifold) 3. Heated oxygen sensor 2
4. Three way catalyst (Under floor) 5. Muffler 6. Heated oxygen sensor 1 harness
connector
7. Heated oxygen sensor 2 harness
connector
BBIA0733E

COOLING FAN CONTROL
EC-743
< FUNCTION DIAGNOSIS >[MR18DE]
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1. Crankshaft position sensor (POS) 2. Comshaft position sensor (PHASE) 3. EVAP canistor purge volume control
solenoid valve
4. ECM 5. Stop lamp switch 6. Accelerator pedal position sensor
PBIA9902J