2014 NISSAN TEANA Service Manual

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Page 1249 of 4801

NISSAN TEANA 2014 Service Manual
P0122, P0123 TP SENSOREC-249
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
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2. Disconnect ECM harness connector.
3. Check the continuity between electric throttle control actua

Page 1250 of 4801

NISSAN TEANA 2014 Service Manual
EC-250
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0122, P0123 TP SENSOR
Check the throttle position sensor. Refer to
EC-250, "Component Inspection".
Is the inspection result normal?
YES >> Check intermitten

Page 1251 of 4801

NISSAN TEANA 2014 Service Manual
P0125 ECT SENSOREC-251
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
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P0125 ECT SENSOR
DTC LogicINFOID:0000000009462204
DTC DETECTION LOGIC
NOTE:
• If DTC P0125 is displayed w

P0125 ECT SENSOREC-251
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P0125 ECT SENSOR
DTC LogicINFOID:0000000009462204
DTC DETECTION LOGIC
NOTE:
• If DTC P0125 is displayed with P0 116, first perform the trouble diagnosis for DTC P0116. Refer to EC-
243, "DTC Logic".
• If DTC P0125 is displayed with P0117 or P0118, fi rst perform the trouble diagnosis for DTC P0117 or
P0118. Refer to EC-245, "DTC Logic"
.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION
With CONSULT
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
3. Check that “COOLAN TEMP/S” is above 10 °C (50 °F).
With GST
Follow the procedure “With CONSULT” above.
Is it above 5
°C (41°F)?
YES >> INSPECTION END
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Start engine and run it for 65 minutes at idle speed.
2. Check 1st tip DTC.
If “COOLAN TEMP/S” indicatio n increases to more than 10°C (50 °F) within 65 minutes, stop engine
because the test resu lt will be OK.
CAUTION:
Be careful not to overheat engine.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-251, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462205
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
DTC No. CONSULT screen terms
(Trouble diagnosis content) DTC detecting condition Possible cause
P0125 ECT SENSOR
(Insufficient coolant tempera-
ture for closed loop fuel control) • Voltage sent to ECM from the sensor is not
practical, even when some time has
passed after starting the engine.
• Engine coolant temperature is insufficient
for closed loop fuel control. • Harness or connectors
(High resistance in the circuit)
• Engine coolant temperature sensor
•Thermostat
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

Page 1252 of 4801

NISSAN TEANA 2014 Service Manual
EC-252
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0125 ECT SENSOR
Check the engine coolant temperature sensor. Refer to
EC-244, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >

Page 1253 of 4801

NISSAN TEANA 2014 Service Manual
P0127 IAT SENSOREC-253
< DTC/CIRCUIT DIAGNOSIS > [QR25DE]
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P0127 IAT SENSOR
DTC LogicINFOID:0000000009462207
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDI

P0127 IAT SENSOREC-253
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P0127 IAT SENSOR
DTC LogicINFOID:0000000009462207
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
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.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1. Wait until engine coolant temperature is less than 96 °C (205 °F)
- Turn ignition switch ON.
- Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
- Check the engine coolant temperature.
- If the engine coolant temperature is not less than 96 °C (205 °F), turn ignition switch OFF and cool down
engine.
NOTE:
Perform the following steps before engine coolant temperature is above 96 °C (205 °F).
2. Turn ignition switch ON.
3. Select “DATA MONITOR” mode of “ENGINE” using CONSULT
4. Start engine.
5. Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.
CAUTION:
Always drive vehicle at a safe speed.
6. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES >> Proceed to EC-253, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000009462208
1.CHECK INTAKE AIR TEMPERATURE SENSOR
Check the intake air temperature sensor. Refer to EC-254, "Component Inspection"
.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-43, "Intermittent Incident".
NO >> Replace mass air flow sensor (with intake air temperature sensor). Refer to EM-29, "Exploded
View".
DTC No.CONSULT screen terms
(Trouble diagnosis content) DTC detecting condition Possible cause
P0127 IAT SENSOR-B1
(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
(Intake air temperature sensor
circuit is open or shorted)
• Intake air temperature sensor
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

Page 1254 of 4801

NISSAN TEANA 2014 Service Manual
EC-254
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0127 IAT SENSOR
Component Inspection
INFOID:0000000009462209
1.CHECK INTAKE AIR TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect mass air flow

Page 1255 of 4801

NISSAN TEANA 2014 Service Manual
P0128 THERMOSTAT FUNCTIONEC-255
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P0128 THERMOSTAT FUNCTION
DTC LogicINFOID:0000000009462210
DTC DETECTION LOGIC
NOTE:
If DTC P0128

P0128 THERMOSTAT FUNCTIONEC-255
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P0128 THERMOSTAT FUNCTION
DTC LogicINFOID:0000000009462210
DTC DETECTION LOGIC
NOTE:
If DTC P0128 is displayed with DTC P0300, P0301, P0302, P0303 or P0304, first perform the trouble
diagnosis for P0300, P0301, P 0302, P0303 or P0304. Refer to EC-318, "DTC Logic"
.
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 being stuck open.
DTC CONFIRMATION PROCEDURE
NOTE:
Never refuel before and during the following procedure.
1.PRECONDITIONING-1
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.PRECONDITIONING-2
With CONSULT
1. Turn ignition switch ON.
2. Check the following conditions:
3. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
4. Check the following conditions:
Is the condition satisfied?
YES >> GO TO 3.
NO >> 1. Satisfy the condition. 2. GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1. Start engine.
2. Drive the vehicle until the following condition is satisfied.
CAUTION:
Always drive vehicle at safe speed.
- STEP 1
DTC No. CONSULT screen terms
(Trouble diagnosis content) DTC detecting condition Possible cause
P0128 THERMSTAT FNCTN
[Coolant thermostat (coolant
temperature below thermostat
regulating temperature)] The engine coolant temperature does not
reach to specified temperature even though
the engine has run long enough. •Thermostat
• Leakage from sealing portion of ther- mostat
• Engine coolant temperature sensor
Ambient temperature −10 °C (14 °F) or more
A/C switch OFF
Blower fan switch OFF
COOLAN TEMP/S −10 °C – 58 °C (14 – 136 °F)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM

Page 1256 of 4801

NISSAN TEANA 2014 Service Manual
EC-256
< DTC/CIRCUIT DIAGNOSIS >[QR25DE]
P0128 THERMOSTAT FUNCTION
Drive the vehicle under the conditions instructed bel
ow until the difference between “COOLAN TEMP/S” and
“FUEL T/TMP SE” be

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