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On Board Diagnosis Logic
NHEC0519
Engine coolant temperature has not risen enough to open the ther-
mostat even though the engine has run long enough.
This is due to a leak in the seal or the thermostat open stuck.
Malfunction is detected when the engine coolant temperature does
not reach to specified temperature even though the engine has run
long enough.
Possible Cause
NHEC0520
I Thermostat function
I Leakage from sealing portion of thermostat
I Engine coolant temperature sensor
DTC Confirmation Procedure
NHEC0521
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
I For best results, perform at ambient temperature of –10°C
(14°F) or higher.
I For best results, perform at engine coolant temperature of
–10°C (14°F) to 60°C (140°F).
WITH CONSULT-II
NHEC0521S01
1) Replace thermostat with new one. Refer to LC-15, “Thermo-
stat”. Use only a genuine NISSAN thermostat as a replace-
ment. If an incorrect thermostat is used, the MIL may come on.
2) Turn ignition switch “ON”.
3) Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.
4) Check that the “COOLAN TEMP/S” is above 60°C (140°F).
If it is below 60°C (140°F), go to following step.
If it is above 60°C (140°F), stop engine and cool down the
engine to less than 60°C (140°F), then retry from step 1.
5) Drive vehicle for 10 consecutive minutes under the following
conditions.
VHCL SPEED SE 80 - 120 km/h (50 - 75 MPH)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-452.
WITH GST
NHEC0521S02
1) Follow the prodedure “WITH CONSULT-II” above.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1126 THERMOSTAT FUNCTION
On Board Diagnosis Logic
EC-451
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