Nissan Frontier D22. Instruction — part 567
DTC P0127 IAT SENSOR
EC-1371
[VG33ER]
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EC
b.
Select “DATA MONITOR” mode with CONSULT-II.
c.
Check the engine coolant temperature.
d.
If the engine coolant temperature is not less than 90
°C (194°F),
turn ignition switch OFF and cool down engine.
●
Perform the following steps before engine coolant temperature
is above 90
°C (194°F).
2.
Turn ignition switch ON.
3.
Select “DATA MONITOR” mode with CONSULT-II.
4.
Start engine.
5.
Hold vehicle speed at more than 70 km/h (43 MPH) for 100 con-
secutive seconds.
6.
If 1st trip DTC is detected, go to
EC-1371, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II”.
Diagnostic Procedure
UBS00DUQ
1.
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to
EC-1371, "Component Inspection"
OK or NG
OK
>> GO TO 2.
NG
>> Replace intake air temperature sensor.
2.
CHECK INTERMITTENT INCIDENT
Refer to
EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
Component Inspection
UBS00DUR
INTAKE AIR TEMPERATURE SENSOR
1.
Check resistance as shown in the figure.
<Reference data>
SEF176Y
SEF947Q
Intake air temperature
°C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
80 (176)
0.27 - 038
SEF012P
EC-1372
[VG33ER]
DTC P0127 IAT SENSOR
2.
If NG, replace in take air temperature sensor.
DTC P0128 THERMOSTAT FUNCTION
EC-1373
[VG33ER]
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EC
DTC P0128 THERMOSTAT FUNCTION
PFP:21200
On Board Diagnosis Logic
UBS00DUS
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat stuck open.
DTC Confirmation Procedure
UBS00DUT
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
●
For best results, perform at ambient temperature of –10
°C (14°F) or higher.
●
For best results, perform at engine coolant temperature of –10
°C (14°F) to 70°C (158°F).
WITH CONSULT-II
1.
Replace thermostat with new one. Refer to
. Use only a genuine NISSAN ther-
mostat as a replacement. 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 70
°C (158°F).
If it is below 70
°C (158°F), go to following step.
If it is above 70
°C (158°F), stop engine and cool down the
engine to less than 70
°C (158°F), then retry from step 1.
5.
Drive vehicle for 10 consecutive minutes under the following
conditions.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic Procedure
UBS00DUU
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to
EC-1374, "Component Inspection"
OK or NG
OK
>> INSPECTION END.
NG
>> Replace engine coolant temperature sensor.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0128
Thermostat function
The engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough.
●
Thermostat
●
Leakage from sealing portion of thermo-
stat
●
Engine coolant temperature sensor
VHCL SPEED SE
80 - 120 km/h (50 - 75 MPH)
PBIB1917E
EC-1374
[VG33ER]
DTC P0128 THERMOSTAT FUNCTION
Component Inspection
UBS00DUV
ENGINE COOLANT TEMPERATURE SENSOR
1.
Check resistance as shown in the figure.
<Reference data>
2.
If NG, replace engine coolant temperature sensor.
Removal and Installation
UBS00DUW
ENGINE COOLANT TEMPERATURE SENSOR
EM-80, "OUTER COMPONENT PARTS"
SEF152P
Temperature
°C (°F)
Resistance k
Ω
20 (68)
2.1 - 2.9
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
SEF012P
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