Nissan Cube. Manual - part 970

TM-136

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

P0778 PRESSURE CONTROL SOLENOID B

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> GO TO 2.

2.

CHECK SECONDARY PRESSURE SOLENOID VALVE

1.

Disconnect CVT unit harness connector.

2.

Check secondary pressure solenoid valve. Refer to 

TM-136, "Component Inspection (Secondary Pres-

sure Solenoid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Secondary pressure solenoid valve is malfunctioning. Replace transaxle assembly. Refer to 

TM-

235, "Exploded View"

.

3.

CHECK HARNESS BETWEEN TCM AND CVT UNIT SECONDARY PRESSURE SOLENOID VALVE)

(PART 1)

1.

Disconnect TCM connector.

2.

Check continuity between TCM vehicle side harness connector terminal and CVT unit vehicle side har-
ness connector terminal.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SOLENOID VALVE)

(PART 2)

Check continuity between TCM vehicle side harness connector terminal and ground.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Secondary Pressure Solenoid Valve)

INFOID:0000000009948998

1.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check resistance between CVT unit harness connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Secondary pressure solenoid valve is malfunctioning. Replace transaxle assembly. Refer to 

TM-

235, "Exploded View"

.

TCM vehicle side harness connector

CVT unit vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

E18

2

F24

3

Existed

TCM vehicle side harness connector

Ground

Continuity

Connector

Terminal

E18

2

Not existed

CVT unit harness connector

Ground

Condition

Resistance (Approx.)

Connector

Terminal

F24

3

CVT fluid temperature: 20

°

C (68

°

F)

5.60 – 6.60 

Ω

CVT fluid temperature: 50

°

C (122

°

F)

6.76 – 6.87 

Ω

CVT fluid temperature: 80

°

C (176

°

F)

7.47 – 7.59 

Ω

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

TM-137

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

C

E

F

G

H

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A

B

TM

N

O

P

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

INFOID:0000000009948999

• Secondary pressure sensor is installed to control valve.
• Secondary pressure sensor detects pressure that is applied to secondary pulley.
• Secondary pressure sensor converts pressure that is applied to secondary pulley to output voltage and

transmits the signal to TCM.

• Secondary pressure sensor changes voltage according to pressure change. The voltage increases as the

pressure increases.

DTC Logic

INFOID:0000000009949000

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Start the engine.

2.

Select “Data Monitor” in “TRANSMISSION”.

3.

Select “ATF TEMP SEN”.

4.

Maintain the following conditions for 5 seconds or more.

5.

Select “Self Diagnostic Results” in “TRANSMISSION”.

With GST

Follow the procedure “With CONSULT”.

Is “P0840” detected?

YES

>> Go to 

TM-137, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009949001

1.

CHECK TCM INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Start the engine.

3.

Check voltage between TCM vehicle side harness connector terminals.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0840

Transmission Fluid Pressure 
Sensor/Switch A Circuit

• Secondary pressure sensor voltage 

that TCM receives is more than 4.7 V

• Secondary pressure sensor voltage 

that TCM receives is less than 0.9 V

• Harness or connectors

(Secondary pressure sensor circuit is 
open or shorted.)

• Secondary pressure sensor

ATF TEMP SEN

: 2.41 V or less

TCM connector

Condition

Voltage (Approx.)

Connector

Terminal

E19

37

42

• Selector lever: “N” position
• Idle speed

0.8 V

TM-138

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

NO

>> GO TO 2.

2.

CHECK POWER AND SENSOR GROUND

1.

Turn ignition switch OFF.

2.

Check voltage between TCM vehicle side harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Go to 

TM-144, "Diagnosis Procedure"

.

3.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SENSOR) (PART 1)

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector and CVT unit harness connector.

3.

Check continuity between TCM vehicle side harness connector terminals and CVT unit vehicle side har-
ness connector terminals.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SECONDARY PRESSURE SENSOR) (PART 2)

Check continuity between TCM vehicle side harness connector terminals and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace transaxle assembly. Refer to 

TM-235, "Exploded View"

.

NO

>> Repair or replace damaged parts.

TCM connector

Condition

Voltage (Approx.)

Connector

Terminal

E19

42

46

Ignition switch: ON

5.0 V

Ignition switch: OFF

0 V

TCM vehicle side harness connector

CVT unit vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

E19

37

F24

23

Existed

42

19

46

20

TCM vehicle side harness connector

Ground

Continuity

Connector

Terminal

E19

37

Not existed

42

46

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

TM-139

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F08B]

C

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A

B

TM

N

O

P

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

INFOID:0000000009949002

A malfunction of oil pressure sensor function is detected by mutual monitoring between secondary pressure
sensor and line pressure.

DTC Logic

INFOID:0000000009949003

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1.

Start the engine.

2.

Select “Data Monitor” in “TRANSMISSION”.

3.

Select “VEHICLE SPEED”.

4.

Drive the vehicle.

5.

Maintain the following conditions for 5 seconds or more.

6.

Stop the vehicle.

7.

Select “Self Diagnostic Results” in “TRANSMISSION”.

Is “P0841” detected?

YES

>> Go to 

TM-139, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009949004

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-209, "Inspection and Judgment"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts. Refer to 

TM-209, "Inspection and Judgment"

.

2.

CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system. Refer to 

TM-137, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check line pressure solenoid valve. Refer to 

TM-140, "Component Inspection (Line Pressure Solenoid

Valve)"

.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0841

Transmission Fluid Pressure 
Sensor/Switch A Circuit 
Range/Performance

Secondary pressure sensor value exceeds 
line pressure value

• Harness or connectors

(secondary pressure sensor circuit is 
open or shorted.)

• Secondary pressure sensor

VEHICLE SPEED

: More than 30 km/h (19 MPH)