Nissan Versa (N17): 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 |
Air conditioning cut control
AIR CONDITIONING CUT CONTROL : System Diagram AIR CONDITIONING CUT CONTROL : System Description INPUT/OUTPUT SIGNAL CHART Sensor Input signal to ECM ECM function Actuator ...
Evaporative emission system
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Other materials:
Seat belt retractor
SEAT BELT RETRACTOR : Removal and Installation
REMOVAL
CAUTION:
Before servicing, turn ignition switch OFF, disconnect battery negative terminal
and wait at least three
minutes.
Disconnect both the negative and positive battery cables, then wait at
least three minutes. Refer to PG " ...
Air mix door cable
AIR MIX DOOR CABLE : Removal and Installation
REMOVAL
Remove foot duct (LH). Refer to VTL "FOOT DUCT : Removal and
Installation".
Disconnect air mix door cable from A/C control.
Disconnect air mix door cable from A/C unit assembly, and then remove
air mix door cable.
INST ...
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