Nissan Murano Z51. Manual - part 1430

P0776 PRESSURE CONTROL SOLENOID B

TM-71

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

YES

>> GO TO 3.

NO

>> Replace transaxle assembly. Refer to 

TM-173, "Exploded View"

.

3.

CHECK LINE PRESSURE SOLENOID VALVE

Check line pressure solenoid valve. Refer to 

TM-71, "Component Inspection (Line Pressure Solenoid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace transaxle assembly. Refer to 

TM-173, "Exploded View"

.

4.

CHECK SECONDARY PRESSURE SENSOR SYSTEM

Check secondary pressure sensor system. Refer to 

TM-74, "DTC Logic"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

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-173, "Exploded View"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Line Pressure Solenoid Valve)

INFOID:0000000005514012

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:0000000005514013

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

TM-72

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0778 PRESSURE CONTROL SOLENOID B

P0778 PRESSURE CONTROL SOLENOID B

Description

INFOID:0000000005514014

The secondary pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition
in response to a signal sent from the TCM.

DTC Logic

INFOID:0000000005514015

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.

Start engine.

2.

Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.

3.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

With GST

Follow the procedure “With CONSULT-III”.

Is “P0778” detected?

YES

>> Go to 

TM-72, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000005514016

1.

CHECK SECONDARY PRESSURE SOLENOID VALVE CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector.

3.

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

Is the inspection result normal?

YES 

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TCM AND SECONDARY PRESSURE SOLENOID VALVE (PART 1)

1.

Disconnect CVT unit connector.

2.

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

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0778

Pressure Control Solenoid B 
Electrical

• Normal voltage is not applied to solenoid 

due to cut line, short, etc.

• TCM detects as irregular by comparing 

target value with monitor value.

• Harness or connectors

(Solenoid circuit is open or shorted.)

• Secondary pressure solenoid valve

TCM vehicle side harness connector

Ground

Resistance (Approx.)

Connector

Terminal

F23

39

3.0 – 9.0 

Ω

TCM vehicle side harness connector

CVT unit vehicle side harness connector

Continuity

Connector

Terminal

Connector

Terminal

F23

39

F24

3

Existed

P0778 PRESSURE CONTROL SOLENOID B

TM-73

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK HARNESS BETWEEN TCM AND SECONDARY PRESSURE SOLENOID VALVE (PART 2)

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK SECONDARY PRESSURE SOLENOID VALVE

Check secondary pressure solenoid valve. Refer to 

TM-73, "Component Inspection (Secondary Pressure

Solenoid Valve)"

.

Is the inspection result normal?

YES 

>> GO TO 5.

NO

>> Replace transaxle assembly. Refer to 

TM-173, "Exploded View"

.

5.

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 (Secondary Pressure Solenoid Valve)

INFOID:0000000005514017

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"

.

TCM vehicle side harness connector

Ground

Continuity

Connector

Terminal

F23

39

Not existed

CVT unit connector

Ground

Resistance (Approx.)

Connector

Terminal

F24

3

3.0 – 9.0 

Ω

TM-74

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

P0840 TRANSMISSION FLUID PRESSURE SEN/SW A

Description

INFOID:0000000005514018

The secondary pressure sensor detects secondary pressure of CVT and sends a signal to the TCM.

DTC Logic

INFOID:0000000005514019

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

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.

Make sure that output voltage of CVT fluid temperature sensor is within the range below.

4.

Start engine and wait for at least 5 consecutive seconds.

With GST

Follow the procedure “With CONSULT-III”.

Is “P0840” detected?

YES

>> Go to 

TM-74, "Diagnosis Procedure"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

Diagnosis Procedure

INFOID:0000000005514020

1.

CHECK INPUT SIGNAL

1.

Start engine.

2.

Check voltage between TCM connector terminal and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 2.

2.

CHECK POWER AND SENSOR GROUND

Check voltage between TCM terminals.

Is the inspection result normal?

DTC

Trouble diagnosis name

DTC is detected if...

Possible cause

P0840

Transmission Fluid Pressure 
Sensor/Switch A Circuit

Signal voltage of the transmission fluid pres-
sure sensor A (secondary pressure sensor) 
is too high or too low while driving.

• Harness or connectors

(Sensor circuit is open or shorted.)

• Secondary pressure sensor

ATF TEMP SEN

: 1.0 – 2.0 V

If it is out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the voltage 
(cool down the fluid)

TCM connector

Ground

Condition

Voltage (Approx.)

Connector

Terminal

F23

15

“N” position idle

1.0 – 1.5 V

TCM connector

Voltage (Approx.)

Connector

Terminal

F23

25

26

4.75 – 5.25 V