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On Board Diagnosis Logic
NHEC0610
This diagnosis checks whether the engine coolant temperature is
extraordinary high, even when the load is not heavy.
When malfunction is detected, the malfunction indicator lamp (MIL)
will light up even in the first trip.
Malfunction is detected when engine coolant temperature is exces-
sively high under normal engine speed.
Possible Cause
NHEC0611
I Harness or connectors
(The cooling fan circuit is open or shorted)
I Cooling fan
I Thermostat
I Improper ignition timing
I Engine coolant temperature sensor
I Blocked radiator
I Blocked front end (Improper fitting of nose mask)
I Crushed vehicle frontal area (Vehicle frontal is collided but not
repaired)
I Blocked air passage by improper installation of front fog lamp
or fog lamps.
I Improper mixture ratio of coolant
I Damaged bumper
For more information, refer to “MAIN 12 CAUSES OF
OVERHEATING”, EC-329.
Overall Function Check
NHEC0612
Use this procedure to check the overall function of the coolant
overtemperature enrichment protection 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 the 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.
SEF621W
WITH CONSULT-II
NHEC0612S01
1) Check the coolant level and mixture ratio (using coolant tester)
in the reservoir tank and radiator.
Allow engine to cool before checking coolant level and
mixture ratio.
I If the coolant level in the reservoir and/or radiator is below the
proper range, go to “Diagnostic Procedure”, EC-318.
I If the coolant mixture ratio is out of the range of 45 to 55%,
replace the coolant in the following procedure MA-14, “Chang-
ing Engine Coolant”.
a) Fill radiator with coolant up to specified level with a filling speed
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0217 COOLANT OVERTEMPERATURE ENRICHMENT PROTECTION
On Board Diagnosis Logic
EC-313
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