Nissan Sentra. Instruction — part 377
EC-204
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0125 ECT SENSOR
Check the engine coolant temperature sensor. Refer to
EC-197, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace engine coolant temperature sensor. Refer to
2.
CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70
°C (158°F)] condition, grasp lower radiator hose and confirm the engine
coolant does not flow.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Repair or replace thermostat. Refer to
CO-21, "Removal and Installation of Thermostat"
Component Inspection
INFOID:0000000009758468
1.
CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Turn ignition switch OFF.
2. Disconnect ECT sensor harness connector.
3. Remove ECT sensor.
4. Check resistance between ECT sensor terminals by heating
with hot water as shown in the figure.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant temperature sensor. Refer to
ECT sensor
Condition
Resistance
(k
Ω)
+
−
Terminal
1
2
Temperature [
°C (°F)]
20 (68)
2.37 - 2.63
50 (122)
0.68 - 1.00
90 (194)
0.236 - 0.260
JMBIA0080ZZ
P0127 IAT SENSOR
EC-205
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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EC
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P0127 IAT SENSOR
DTC Logic
INFOID:0000000009758469
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
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758470
1.
CHECK INTAKE AIR TEMPERATURE SENSOR
Check the intake air temperature sensor. Refer to
EC-206, "Component Inspection"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
.
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
EC-206
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0127 IAT SENSOR
Component Inspection
INFOID:0000000009758471
1.
CHECK INTAKE AIR TEMPERATURE SENSOR
1. Turn ignition switch OFF.
2. Disconnect mass air flow sensor harness connector and reconnect it again.
3. Turn ignition switch ON.
4. Select “DATA MONITOR” mode with CONSULT.
5. Check that the indicated value of “INT/A TEMP SEN” is almost the same as intake air temperature.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace mass air flow sensor (with intake air temperature sensor). Refer to
P0128 THERMOSTAT FUNCTION
EC-207
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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P0128 THERMOSTAT FUNCTION
DTC Logic
INFOID:0000000009758472
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, P0302, P0303 or P0304. Refer to
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
COOLANT TEMP/S
−10°C – 58°C (14 – 136°F)
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