Nissan Frontier D22. Instruction — part 415
DTC P0127 IAT SENSOR
EC-763
[VG33E]
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DTC P0127 IAT SENSOR
PFP:22630
Component Description
UBS00DHE
The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a signal
to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
<Reference data>
*: These data are reference values and are measured between ECM terminal 61
(Intake air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than the ECM terminals, such as the ground.
On Board Diagnosis Logic
UBS00DHF
DTC Confirmation Procedure
UBS00DHG
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.
CAUTION:
Always drive vehicle at a safe speed.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road
test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-II
1.
Wait until engine coolant temperature is less than 90
°C (194°F).
a.
Turn ignition switch ON.
LEC519
Intake air
temperature
°C (°F)
Voltage*
(V)
Resistance
k
Ω
20 (68)
3.5
2.1 - 2.9
80 (176)
1.23
0.27 - 0.38
SEF012P
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0127
Intake air temperature
too high
Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signal
from engine coolant temperature sensor.
●
Harness or connectors
(The sensor circuit is open or shorted)
●
Intake air temperature sensor
EC-764
[VG33E]
DTC P0127 IAT SENSOR
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-764, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II”.
Diagnostic Procedure
UBS00DHH
1.
CHECK INTAKE AIR TEMPERATURE SENSOR
EC-764, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace intake air temperature sensor.
2.
CHECK INTERMITTENT INCIDENT
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
For Wiring Diagram, refer to
>> INSPECTION END.
Component Inspection
UBS00DHI
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
DTC P0127 IAT SENSOR
EC-765
[VG33E]
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2.
If NG, replace in take air temperature sensor.
EC-766
[VG33E]
DTC P0128 THERMOSTAT FUNCTION
DTC P0128 THERMOSTAT FUNCTION
PFP:21200
On Board Diagnosis Logic
UBS00DHJ
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
UBS00DHK
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
EC-766, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic Procedure
UBS00DHL
1.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-767, "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
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