Infiniti I35 (A33). Manual — part 294
System Description
NHEC1320
COOLING FAN CONTROL
NHEC1320S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Wheel sensor
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 3-step control [HIGH/LOW/OFF].
OPERATION
NHEC1320S02
SEC005E
CONSULT-II Reference Value in Data Monitor
Mode
NHEC1321
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
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DTC P1217 ENGINE OVER TEMPERATURE
System Description
EC-517
MONITOR ITEM
CONDITION
SPECIFICATION
COOLING FAN
I
After warming up engine, idle
the engine.
I
Air conditioner switch: OFF
Engine coolant temperature is
94°C (201°F) or less
OFF
Engine coolant temperature is
between 95°C (203°F) and 99°C
(210°F)
LOW
Engine coolant temperature is
100°C (212°F) or more
HIGH
On Board Diagnosis Logic
NHEC1454
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.
This self-diagnosis has the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P1217
1217
Engine over tempera-
ture
I
Cooling fan does not operate properly (Over-
heat).
I
Cooling fan system does not operate properly
(Overheat).
I
Engine coolant was not added to the system
using the proper filling method.
I
Engine coolant is not within the specified range.
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-534.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant following the procedure in the MA-14,
“Changing Engine Coolant”. 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-12, “Anti-freeze Coolant Mixture Ratio”.
2) After refilling coolant, run engine to ensure that no water-flow noise is emitted.
DTC P1217 ENGINE OVER TEMPERATURE
CONSULT-II Reference Value in Data Monitor Mode (Cont’d)
EC-518
SEF621W
SEF111X
Overall Function Check
NHEC1324
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
NHEC1324S01
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-523.
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-523.
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-523.
SEC163BA
MEC475B
WITH GST
NHEC1324S03
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-523.
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-523.
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 at low speed.
If NG, go to “Diagnostic Procedure”, EC-523.
If OK, go to the following step.
9)
Turn ignition switch OFF.
10) Turn air conditioner switch and blower fan switch OFF.
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DTC P1217 ENGINE OVER TEMPERATURE
Overall Function Check
EC-519
11) Disconnect engine coolant temperature sensor harness con-
nector.
12) Connect 150
Ω
resistor to engine coolant temperature sensor
harness connector.
13) Restart engine and make sure that cooling fan operates at
higher speed than low speed.
Be careful not to overheat engine.
14) If NG, go to “Diagnostic Procedure”, EC-523.
DTC P1217 ENGINE OVER TEMPERATURE
Overall Function Check (Cont’d)
EC-520
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