Nissan Versa

 Sedan Service Manual

Engine » Engine control system (EC)
Cooling fan control

Cooling fan control : system diagram

Cooling fan control : system description

INPUT/OUTPUT SIGNAL CHART

Sensor	Input signal to ECM	ECM function	Actuator
Crankshaft position sensor (POS) Camshaft position sensor (PHASE)	Engine speed*1 Piston position	Cooling fan speed request signal	IPDM E/R ↓ Cooling fan relay ↓ Cooling fan motor
Engine coolant temperature sensor	Engine coolant temperature
Battery	Battery voltage*1
Refrigerant pressure sensor	Refrigerant pressure
Combination meter	Vehicle speed signal*2
BCM	A/C ON signal*2 Blower fan signal*2

*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 (EXCEPT FOR SINGLE CONNECTOR COOLING FAN WITHOUT A/C)

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 3step control [HIGH/LOW/OFF].

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

Cooling fan speed	Cooling fan low relay	Cooling fan high relay	Cooling fan relay
Stop (OFF)	OFF	OFF	OFF
Low (LOW)	ON	OFF	OFF
High (HI)	ON	ON	ON

SYSTEM DESCRIPTION (FOR SINGLE CONNECTOR COOLING FAN WITHOUT A/C)

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 2step control [HIGH/OFF].

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

Cooling fan speed	Cooling fan low relay
Stop (OFF)	OFF
Operate (HI)	ON

Precaution

Engine control system

Structure and operation

Engine control system

Multiport fuel injection system

Electric ignition system

Air conditioning cut control

Cooling fan control

Evaporative emission system

Intake valve timing control

Exhaust valve timing control

Engine protection control at low engine oil pressure

Fuel filler cap warning system

Automatic speed control device (ASCD)

Automatic speed control device (ASCD)

Diagnosis description

Ecm

Diagnosis and repair workflow

Additional service when replacing ECM

Accelerator pedal released position learning

Throttle valve closed position learning

Idle air volume learning

Mixture ratio selflearning value clear

Basic inspection

Fuel pressure check

How to set SRT code

How to erase permanent DTC

Trouble diagnosis specification value

Power supply and ground circuit

U0101 can comm circuit

U1001 CAN comm circuit

P0011 IVT control

P0014 EVT control

P0031, P0032 A/F sensor 1 heater

P0037, P0038 HO2s2 heater

P0075 IVT control solenoid valve

P0078 EVT control solenoid valve

P0101 MAF sensor

P0102, P0103 MAF sensor

P0111 IAT sensor

P0112, P0113 IAT sensor

P0116 ECT sensor

P0117, P0118 ECT sensor

P0122, P0123 TP sensor

P0125 ECT sensor

P0127 IAT sensor

P0128 thermostat function

P0130 A/F sensor 1

P0131 A/F sensor 1

P0132 A/F sensor 1

P0137 HO2s2

P0138 HO2s2

P0139 HO2s2

P014C, P014D, P015A, P015B, A/F sensor 1

P0171 fuel injection system function

P0181 FTT sensor

P0182, P0183 FTT sensor

P0196 EOT sensor

P0197, P0198 EOT sensor

P0222, P0223 TP sensor

P0300, P0301, P0302, P0303, P0304 misfire

P0327, P0328 KS

P0335 CKP sensor (POC)

P0340 CMP sensor (PHASE)

P0420 three way catalyst function

P0441 EVAP control system

P0443 EVAP canister purge volume control solenoid valve

P0444, P0445 EVAP canister purge volume control solenoid valve

P0447 EVAP canister vent control valve

P0448 EVAP canister vent control valve

P0451 EVAP control system pressure sensor

P0452 EVAP control system pressure sensor

P0453 EVAP control system pressure sensor

P0456 EVAP control system

P0460 fuel level sensor

P0461 fuel level sensor

P0462, P0463 fuel level sensor

P0500 VSS

P0506 ISC system

P0507 ISC system

P050a, P050b, P050e cold start control

P0520 EOP sensor

P0524 engine oil pressure

P0603 ECM power supply

P0605 ECM

P0607 ECM

P0643 sensor power supply

P0850 PNP switch

P1078 EVT control position sensor

P1148 closed loop control

P117A air fuel ratio

P1212 TCS communication line

P1217 engine over temperature

P1225 TP sensor

P1226 TP sensor

P1550 battery current sensor

P1551, P1552 battery current sensor

P1553 battery current sensor

P1554 battery current sensor

P1564 ASCD steering switch

P1572 ASCD brake switch

P1574 ASCD vehicle speed sensor

P1715 Input speed sensor

P1720 VSS

P1805 brake switch

P2096, P2097 A/F sensor 1

P2100, P2103 throttle control motor relay

P2101 electric throttle control function

P2118 throttle control motor

P2119 electric throttle control actuator

P2122, P2123 APP sensor

P2127, P2128 APP sensor

P2135 TP sensor

P2138 APP sensor

Brake pedal position switch

Clutch pedal position switch

Cooling fan

Electrical load signal

Fuel injector

Fuel pump

Ignition signal

Malfunction indicator lamp

On board refueling vapor recovery (ORVR)

Refrigerant pressure sensor

Engine control system symptoms

Normal operating condition

IDLE SPEED

Ignition timing

Evaporative emission system

EVAP leak check

Positive crankcase ventilation

Removal and installation

Service data and specifications (SDS)