Nissan Juke F15. Manual - part 361

P0125 ECT SENSOR

EC-257

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

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Diagnosis Procedure

INFOID:0000000012197817

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check the engine coolant temperature sensor. Refer to

EC-257, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace engine coolant temperature sensor. Refer to 

CO-25, "Exploded View"

.

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-45, "Intermittent Incident"

.

NO

>> Repair or replace thermostat. Refer to 

CO-23, "Removal and Installation"

.

Component Inspection

INFOID:0000000012197818

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 

EM-100, "Exploded View"

.

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

EC-258

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0127 IAT SENSOR

P0127 IAT SENSOR

DTC Logic

INFOID:0000000012197819

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-258, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000012197820

1.

CHECK INTAKE AIR TEMPERATURE SENSOR 1

Check the intake air temperature sensor 1. Refer to 

EC-259, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-45, "Intermittent Incident"

.

DTC No.

Trouble diagnosis name

(Trouble diagnosis con-

tent)

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 1 circuit is 
open or shorted)

• Intake air temperature sensor 1

P0127 IAT SENSOR

EC-259

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

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NO

>> Replace mass air flow sensor (with intake air temperature sensor 1). Refer to 

EM-27, "Exploded

View"

.

Component Inspection

INFOID:0000000012197821

1.

CHECK INTAKE AIR TEMPERATURE SENSOR 1

1. Turn ignition switch OFF.

2. Disconnect mass air flow sensor harness connector.

3. Check resistance between mass air flow sensor terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace mass air flow sensor (with intake air temperature sensor 1). Refer to 

EM-27, "Exploded

View"

.

Mass air flow sensor

Condition

Resistance (k

Ω)

+

−

Terminals

1

2

Temperature [

°C (°F)]

25 (77)

1.800 - 2.200

EC-260

< DTC/CIRCUIT DIAGNOSIS >

[MR FOR NISMO RS MODELS]

P0128 THERMOSTAT FUNCTION

P0128 THERMOSTAT FUNCTION

DTC Logic

INFOID:0000000012197822

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, P0304. Refer to 

EC-335, "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-I

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-II

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-I

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.

Trouble diagnosis name

(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 – 52°C (14 – 126°F)