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
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Evaporative emission system
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Other materials:
Stall test
Work Procedure
INSPECTION
Inspect the amount of engine oil. Replenish the engine oil if necessary.
Refer to LU "Inspection".
Drive for about 10 minutes to warm up the vehicle so that the A/T fluid
temperature is 50 to 80C (122 to
176F).
Inspect the amount of ATF. Replenish ...
P072D Stuck in 2GR
DTC Logic
DTC DETECTION LOGIC
DTC
Trouble diagnosis name
DTC detection condition
Possible causes
P072D
Stuck in Gear 2
The following diagnosis conditions
are met and the detection
conditions continue for 0.5 seconds
or more.- Diagnosis condition
- Shiftin ...
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