Nissan Primera P11. Instruction — part 183
System Description
NCEC0433
COOLING FAN CONTROL
NCEC0433S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Vehicle speed sensor or ABS actuator and
electric unit (control unit)
Vehicle speed
Cooling fan
control
Cooling fan relay(s)
Engine coolant temperature sensor
Engine coolant temperature
Air conditioner switch
Air conditioner “ON” signal
Ignition switch
Start signal
Refrigerant pressure sensor
Refrigerant pressure
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger-
ant pressure, and air conditioner ON signal. The control system has ON-OFF control.
The refrigerant pressure sensor uses an electrostatic volume pressure transducer to convert refrigerant pres-
sure to voltage. The transducer is installed in the liquid tank of the air conditioner system.
OPERATION
NCEC0433S02
Engine coolant temperatures at which the cooling fan turns “ON” are indicated in the Table below.
Vehicle speed km/h (MPH)
Air conditioner switch
High pressure of
refrigerant
kPa (bar, kg/cm
2
, psi)
Less than 20 (12)
20 - 80 (12 - 50)
More than 80 (50)
ON
More than 1,760
(17.6, 17.95, 255)
Always
Always
More than 95°C (203°F)
Less than 1,760
(17.6, 17.95, 255)
Always
More than 95°C (203°F)
More than 95°C (203°F)
OFF
More than 100°C
(212°F)
More than 95°C (203°F)
More than 95°C (203°F)
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0486
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
AIR COND SIG
I
Engine: After warming up, idle
the engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates)
ON
COOLING FAN
I
After warming up engine, idle
the engine.
I
Air conditioner switch: OFF
Engine coolant temperature is less
than 99°C (210°F)
OFF
Engine coolant temperature is
100°C (212°F) or more
ON
SEF099X
DTC P1217 OVERHEAT (COOLING SYSTEM)
QG16
I
18DE
System Description
EC-289
ECM Terminals and Reference Value
=NCEC0487
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
13
LG/R
Cooling fan relay
[Engine is running]
I
Cooling fan is not operating
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Cooling fan is operating
Approximately 0V
23
L/W
Air conditioner switch
[Engine is running]
I
Both air conditioner switch and blower switch are
“ON” (Compressor operates)
Approximately 0V
[Engine is running]
I
Air conditioner switch is “OFF”
BATTERY VOLTAGE
(11 - 14V)
On Board Diagnosis Logic
NCE0488
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
Diagnostic
Trouble Code
No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P1217
1217
I
Cooling fan does not operate properly (Overheat).
I
Cooling fan system does not operate properly (Overheat).
I
Engine coolant was not added to the system using the
proper filling method.
I
Harness or connectors
(The cooling fan circuit is open or shorted).
I
Cooling fan
I
Radiator hose
I
Radiator
I
Radiator cap
I
Water pump
I
Thermostat
For more information, refer to “MAIN 12 CAUSES
OF OVERHEATING”, EC-QG-298.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant following the procedure in the MA
section (“Changing Engine Coolant”, “ENGINE MAINTENANCE”). Also, replace the engine oil.
1) Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to use
coolant with the proper mixture ratio. Refer to MA section (“Anti-freeze Coolant Mixture Ratio”, “RECOM-
MENDED FLUIDS AND LUBRICANTS”).
2) After refilling coolant, run engine to ensure that no water-flow noise is emitted.
DTC P1217 OVERHEAT (COOLING SYSTEM)
QG16
I
18DE
ECM Terminals and Reference Value
EC-290
Overall Function Check
NCEC0489
Use this procedure to check the overall function of the cooling fan.
During this check, a DTC might not be confirmed.
WARNING:
Never remove the radiator cap when the engine is hot. Serious
burns could be caused by high pressure fluid escaping from
the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by
turning it a quarter turn to allow built-up pressure to escape.
Then turn the cap all the way off.
With CONSULT-II
1)
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to “Diagnos-
tic Procedure”, EC-QG-294.
2)
Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to “Diagnos-
tic Procedure”, EC-QG-294.
3)
Turn ignition switch “ON”.
4)
Perform “COOLING FAN” in “ACTIVE TEST” mode with CON-
SULT-II.
5)
If the results are NG, go to “Diagnostic Procedure”, EC-QG-
294.
Without CONSULT-II
1)
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to “Diagnos-
tic Procedure”, EC-QG-294.
2)
Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to “Diagnos-
tic Procedure”, EC-QG-294.
3)
Start engine.
Be careful not to overheat engine.
4)
Set temperature control lever to full cold position.
5)
Turn air conditioner switch “ON”.
6)
Turn blower fan switch “ON”.
7)
Run engine at idle for a few minutes with air conditioner oper-
ating.
Be careful not to overheat engine.
8)
Make sure that cooling fan operates.
If NG, go to “Diagnostic Procedure”, EC-QG-294.
SEF621WA
SEF111X
SEC163BA
DTC P1217 OVERHEAT (COOLING SYSTEM)
QG16
I
18DE
Overall Function Check
EC-291
Wiring Diagram
NCEC0490
YEC789
: Detectable line for DTC
: Non-detectable line for DTC
COOLING
FAN
RELAY
FUSE
BLOCK
(J/B)
COOLING
FAN
MOTOR-2
Refer to EL-POWER.
BATTERY
COOLING
FAN
MOTOR-1
IGNITION SWITCH
ON or START
Refer to last page (Foldout page)
DTC P1217 OVERHEAT (COOLING SYSTEM)
QG16
I
18DE
Wiring Diagram
EC-292
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