Nissan Versa Sedan. Manual - part 301

P0128 THERMOSTAT FUNCTION

EC-203

< DTC/CIRCUIT DIAGNOSIS >

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P0128 THERMOSTAT FUNCTION

DTC Logic

INFOID:0000000009267106

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-264, "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 

thermostat

• 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) (M/T)
−10°C – 46°C (14 – 115°F) (A/T or CVT)

EC-204

< DTC/CIRCUIT DIAGNOSIS >

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P0128 THERMOSTAT FUNCTION

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

“FUEL T/TMP SE” becomes at least 25

°C (45°F).

*: Example

-

STEP 2

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

T/TMP SE” maintained at 23

°C (41°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 “COOLAN 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-II

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-204, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009267107

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check the engine coolant temperature sensor. Refer to 

EC-205, "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"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace thermostat. Refer to 

CO-21, "Removal and Installation"

.

COOLAN TEMP/S

71

°C (160°F) or less (M/T)

65

°C (149°F) or less (A/T or CVT)

FUEL T/TMP SE

Less than the value calculated by subtracting 
25

°C (45°F) from “COOLAN TEMP/S”.*

COOLAN TEMP/S

FUEL T/TMP SE

70

°C (158°F)

47

°C (117°F) or less

65

°C (149°F)

42

°C (108°F) or less

60

°C (140°F)

37

°C (99°F) or less

COOLAN TEMP/S

71

°C (160°F) or more (M/T)

65

°C (149°F) or more (A/T or CVT)

P0128 THERMOSTAT FUNCTION

EC-205

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Component Inspection

INFOID:0000000009267108

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF.

2. Disconnect engine coolant temperature sensor harness connector.

3. Remove engine coolant temperature sensor. Refer to 

CO-24, "Exploded View"

.

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 temperature 

sensor

Condition

Resistance 

(k

Ω)

Terminal

1

2

Temperature [

°C (°F)]

20 (68)

2.10 - 2.90

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

JMBIA0080ZZ

EC-206

< DTC/CIRCUIT DIAGNOSIS >

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P0130 A/F SENSOR 1

P0130 A/F SENSOR 1

DTC Logic

INFOID:0000000009267109

DTC DETECTION LOGIC

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

nal 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.
Do you have CONSULT?

YES

>> GO TO 2.

NO

>> GO TO 6.

2.

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

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

2. Select “ENGINE” using CONSULT.

3. Select “A/F SEN1 (B1)” in “DATA MONITOR” mode.

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

YES

>> GO TO 3.

NO

>> Go to 

EC-207, "Diagnosis Procedure"

.

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION -I

1. Select “ENGINE” using CONSULT.

2. Select “A/F SEN1 (B1) P1276” (for DTC P0130) of “A/F SEN1” in “DTC WORK SUPPORT” mode.

3. Touch “START”.

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

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 4.

NO

>> Check A/F sensor 1 function again. GO TO 2.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION -II

Release accelerator pedal fully.

NOTE:

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0130

Air fuel ratio (A/F) sensor 1 
circuit

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

• Harness or connectors

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

• A/F sensor 1

ENG SPEED

1,600 - 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 (A/T or CVT models)
5th position (M/T models)