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On Board Diagnosis Logic
=NHEC0557
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.
Malfunction is detected when cooling fan does not operate properly (Overheat), cooling fan system does not
operate properly (Overheat) and engine coolant was not added to the system using the proper filling method.
Possible Cause
NHEC0563
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-505.
CAUTION:
When a malfunction is indicated, be sure to replace the cool-
ant 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 fill-
ing 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.
SEF621W
SEF111X
Overall Function Check
NHEC0558
Use this procedure to check the overall function of the cooling fan.
During this check, a 1st trip 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
NHEC0558S01
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-494.
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-494.
3) Turn ignition switch “ON”.
4) Perform “COOLING FAN” in “ACTIVE TEST” mode with CON-
SULT-II.
DTC P1217 ENGINE OVER TEMPERATURE (OVERHEAT)
On Board Diagnosis Logic
EC-490
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