Nissan Sentra. Manual - part 378

EC-208

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0128 THERMOSTAT FUNCTION

Drive the vehicle under the conditions instructed below until the difference between “COOLANT TEMP/S”

and “FUEL T/TMP SE” becomes at least 26

°C (47°F).

*: Example

-

STEP 2

Drive the vehicle at 50 km/h (32 MPH) or more with the difference between “COOLANT TEMP/S” and “FUEL

T/TMP SE” maintained at 26

°C (47°F) or more.

NOTE:

Keep the accelerator pedal as steady as possible during cruising.

-

STEP 3

Drive the vehicle at 50 km/h (32 MPH) or more until “COOLANT TEMP/S” increases by 6

°C (11°F).

NOTE:

Keep the accelerator pedal as steady as possible during cruising.

Is the condition satisfied?

YES

>> GO TO 4.

NO

>> GO TO 1.

4.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

1. Drive the vehicle until the following condition is satisfied.

CAUTION:

Always drive vehicle at safe speed.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-208, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758473

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check the engine coolant temperature sensor. Refer to 

EC-208, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace engine coolant temperature sensor. Refer to 

CO-24, "Exploded View"

.

2.

CHECK THERMOSTAT

Check the thermostat. Refer to 

CO-21, "Removal and Installation of Thermostat"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace thermostat.

Component Inspection

INFOID:0000000009758474

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

COOLANT TEMP/S

66

°C (151°F) or less

FUEL T/TMP SE

Less than the value calculated by sub-
tracting 26

°C (47°F) from “COOLANT 

TEMP/S”.*

COOLANT TEMP/S

FUEL T/TMP SE

70

°C (158°F)

44

°C (111°F) or less

65

°C (149°F)

39

°C (102°F) or less

60

°C (140°F)

34

°C (93°F) or less

COOLANT TEMP/S

67

°C (153°F) or more

P0128 THERMOSTAT FUNCTION

EC-209

< DTC/CIRCUIT DIAGNOSIS >

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1. Turn ignition switch OFF.

2. Disconnect engine coolant temperature sensor harness connector.

3. Remove engine coolant temperature sensor.

4. Check resistance between engine coolant temperature 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 

CO-24, "Exploded View"

.

Engine coolant tem-

perature 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-210

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0130 A/F SENSOR 1

P0130 A/F SENSOR 1

DTC Logic

INFOID:0000000009758475

DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1

signal fluctuates according to fuel feedback control.

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:

Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Let it idle for 2 minutes.

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-211, "Diagnosis Procedure"

.

NO-1 ( With CONSULT)>>GO TO 3.
NO-2 ( Without CONSULT)>>GO TO 7.

3.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 FUNCTION

1. Select “A/F SEN1 (B1)” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

2. Check “A/F SEN1 (B1)” indication.
Does the indication fluctuates around 2.2 V?

YES

>> GO TO 4.

NO

>> Proceed to 

EC-211, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-1

1. Select “A/F SEN1 (B1) P1276” of “A/F SEN1” in “DTC WORK SUPPORT” mode of “ENGINE” using CON-

SULT.

2. Touch “START”.

3. When the following conditions are met, “TESTING” will be displayed on the CONSULT screen.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0130

A/F SENSOR1 (B1)
(O2 sensor circuit bank 1 
sensor 1)

A)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly in the range other 
than approx. 2.2 V.

• Harness or connectors

(A/F sensor 1 circuit is open or 
shorted.)

• A/F sensor 1

B)

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 2.2 V.

ENG SPEED

1,000 - 3,200 rpm

VHCL SPEED SE

More than 64 km/h (40 mph)

B/FUEL SCHDL

1.0 - 8.0 msec

Selector lever

D position (CVT)
5th position (6MT)

P0130 A/F SENSOR 1

EC-211

< DTC/CIRCUIT DIAGNOSIS >

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If “TESTING” is not displayed after 20 seconds, retry from step 2.

CAUTION:

Always drive vehicle at a safe speed.

Is “TESTING” displayed on CONSULT screen?

YES

>> GO TO 5.

NO

>> 1. Check A/F sensor 1 function again.

2. GO TO 3.

5.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-2

Release accelerator pedal fully.

NOTE:

Never apply brake during releasing the accelerator pedal.
Which does “TESTING” change to?

COMPLETED>>GO TO 6.

OUT OF CONDITION>>1.Retry DTC CONFIRMATION PROCEDURE.

2. GO TO 4.

6.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B-3

Touch “SELF-DIAG RESULT”
Which is displayed on CONSULT screen?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-211, "Diagnosis Procedure"

.

7.

PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

Perform Component Function Check. Refer to 

EC-211, "Component Function Check"

.

NOTE:

Use component function check to check the overall function of the A/F sensor 1 circuit. During this check, a

1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-211, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000009758476

1.

PERFORM COMPONENT FUNCTION CHECK

With GST

1. Start engine and warm it up to normal operating temperature.

2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.

3. Shift the selector lever to the D position (CVT) or 5th position (M/T), then release the accelerator pedal

fully until the vehicle speed decreases to 50 km/h (31 MPH).

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

Never apply brake during releasing the accelerator pedal.

4. Repeat steps 2 to 3 for five times.

5. Stop the vehicle and turn ignition switch OFF.

6. Wait at least 10 seconds and restart engine.

7. Repeat steps 2 to 3 for five times.

8. Stop the vehicle.

9. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-211, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758477

1.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY

1. Turn ignition switch OFF.