Nissan Murano Z51. Manual - part 1431

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

TM-75

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

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M

A

B

TM

N

O

P

YES

>> GO TO 3.

NO

>> GO TO 5.

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 connector.

3.

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 SENSOR) (PART 2)

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

5.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART

1)

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector and CVT unit 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 6.

NO

>> Repair or replace damaged parts.

6.

CHECK HARNESS BETWEEN TCM AND CVT UNIT (SENSOR POWER AND SENSOR GROUND) (PART

2)

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

CHECK TCM

TCM vehicle side harness connector

CVT unit vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

F23

15

F24

23

Existed

TCM vehicle side harness connector

Ground

Continuity

Connector

Terminal

F23

15

Not existed

TCM vehicle side harness connector

CVT unit vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

F23

25

F24

19

Existed

26

20

TCM vehicle side harness connector

Ground

Continuity

Connector

Terminal

F23

25

Not existed

26

TM-76

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

1.

Replace with the same type of TCM. Refer to 

TM-160, "Exploded View"

.

2.

Connect each connector.

3.

Perform “DTC CONFIRMATION PROCEDURE”. Refer to 

TM-74, "DTC Logic"

.

Is “P0840” detected?

YES

>> Replace transaxle assembly. Refer to 

TM-173, "Exploded View"

.

NO

>> Replace TCM. Refer to 

TM-160, "Exploded View"

.

8.

DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> Replace TCM. Refer to 

TM-160, "Exploded View"

.

NO

>> Repair or replace damaged parts.

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

TM-77

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

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J

K

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A

B

TM

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P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

INFOID:0000000005514021

Using the engine load (throttle position), the primary pulley revolution speed, and the secondary pulley revolu-
tion speed as input signals, TCM changes the operating pressure of the primary pulley and the secondary pul-
ley and changes the groove width of the pulley to control the gear ratio.

DTC Logic

INFOID:0000000005514022

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
Immediately after performing any “DTC CONFIRMATION PROCEDURE”, always turn ignition switch OFF.
Then wait at least 10 seconds before performing the next test.

1.

CHECK DTC DETECTION

With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “Data Monitor” in “TRANSMISSION”.

3.

Start engine and maintain the following conditions for at least 12 consecutive seconds.

Is “P0841” detected?

YES

>> Go to 

TM-77, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000005514023

1.

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

TM-153, "Inspection and Judgment"

.

Is the inspection result normal?

YES

>> .GO TO 2.

NO

>> Repair or replace damaged parts. Refer to 

TM-153, "Inspection and Judgment"

.

2.

CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system. Refer to 

TM-74, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK PRIMARY PRESSURE SENSOR SYSTEM

Check primary pressure sensor system. Refer to 

TM-79, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0841

Transmission Fluid Pressure 
Sensor/Switch A Circuit 
Range/Performance

Correlation between the values of the trans-
mission fluid pressure sensor A (secondary 
pressure sensor) and the transmission fluid 
pressure sensor B (primary pressure sen-
sor) is out of specification.

• Harness or connectors

(Sensor circuit is open or shorted.)

• Secondary pressure sensor
• Primary pressure sensor

VEHICLE SPEED

: 40 km/h (25 MPH) or more

RANGE

: “D” position

TM-78

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0841 TRANSMISSION FLUID PRESSURE SEN/SW A

4.

CHECK LINE PRESSURE SOLENOID VALVE

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit connector.

3.

Check line pressure solenoid valve. Refer to 

TM-78, "Component Inspection (Line Pressure Solenoid

Valve)"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check secondary pressure solenoid valve. Refer to 

TM-78, "Component Inspection (Secondary Pressure

Solenoid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

CHECK STEP MOTOR SYSTEM

Check step motor system. Refer to 

TM-96, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

DETECT MALFUNCTIONING ITEMS

Check TCM connector pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES

>> Replace TCM. Refer to 

TM-160, "Exploded View"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Line Pressure Solenoid Valve)

INFOID:0000000005514024

1.

CHECK LINE PRESSURE SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-173, "Exploded View"

.

Component Inspection (Secondary Pressure Solenoid Valve)

INFOID:0000000005514025

1.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace transaxle assembly. Refer to 

TM-173, "Exploded View"

.

CVT unit connector

Ground

Resistance (Approx.)

Connector

Terminal

F24

2

3.0 – 9.0 

Ω

CVT unit connector

Ground

Resistance (Approx.)

Connector

Terminal

F24

3

3.0 – 9.0 

Ω