Nissan Murano Z50 (2007 year). Manual - part 53

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

CVT-109

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CVT

Revision: 2006 July

2007 Murano

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

PFP:31940

Description

NCS00157

This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This
is not only caused by electrical malfunction (circuits open or shorted), but also by mechanical malfunction such
as control valve sticking, improper solenoid valve operation, etc.

CONSULT-II Reference Value

NCS00158

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS00159

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P0744 A/T TCC S/V FNCTN” with CONSULT-II is detected under the following
conditions.

–

When CVT cannot perform lock-up even if electrical circuit is good.

–

When TCM compares difference value with slip revolution and detects an irregularity.

Possible Cause

NCS0015A

●

Torque converter clutch solenoid valve

●

Hydraulic control circuit

DTC Confirmation Procedure

NCS0015B

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.

3.

Start engine and maintain the following condition for at least 30
seconds.
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position 
[Vehicle speed: Constant speed of more than 40 km/h (25
MPH)]

4.

If DTC is detected go to 

CVT-110, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the tachometer reading.

PRI SPEED SEN

During driving (lock-up ON)

Approximately matches the engine speed.

BCIA0031E

CVT-110

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

Revision: 2006 July

2007 Murano

Diagnostic Procedure

NCS0015C

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

3.

Start vehicle.

4.

Check if there is a great difference between “ENG SPEED SIG”
and “PRI SPEED SEN”. (Lock-up ON.)

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 2.

2. 

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

CVT-43, "LINE PRESSURE

TEST"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts. Refer to 

CVT-44,

"Judgment of Line Pressure Test"

 .

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

Torque converter clutch solenoid valve. Refer to 

CVT-108, "Component Inspection"

 .

●

Lock-up select solenoid valve. Refer to 

CVT-166, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED 

SENSOR (PRIMARY SPEED SENSOR) SYSTEM

Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to 

CVT-94, "DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)"

 ,

CVT-89, "DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

Item name

Condition

Display value

ENG SPEED SIG

Engine running

Closely matches the 
tachometer reading.

PRI SPEED SEN

During driving (lock-up ON)

Approximately matches 
the engine speed.

SCIA2279E

SAT494G

DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)

CVT-111

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5. 

CHECK DTC

Perform 

CVT-109, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6. 

CHECK TCM

1.

Check TCM input/output signals. Refer to 

CVT-53, "TCM Input/Output Signal Reference Values"

 .

2.

If NG, re-check TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> 1. Repair or replace damaged parts.

2. Replace the transaxle assembly. Refer to 

CVT-215, "Removal and Installation"

 .

CVT-112

DTC P0745 LINE PRESSURE SOLENOID VALVE

Revision: 2006 July

2007 Murano

DTC P0745 LINE PRESSURE SOLENOID VALVE

PFP:31940

Description

NCS0015D

The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pres-
sure to suit the driving condition in response to a signal sent from the TCM.

CONSULT-II Reference Value

NCS0015E

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS0015F

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P0745 L/PRESS SOL/CIRC” with CONSULT-II is detected under the following
conditions.

–

TCM detects an improper voltage drop when it tries to operate the solenoid valve.

–

When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

NCS0015G

●

Harness or connectors
(Solenoid circuit is open or shorted.)

●

Pressure control solenoid valve A (Line pressure solenoid valve)

DTC Confirmation Procedure

NCS0015H

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Start engine and wait at least 5 seconds.

3.

If DTC is detected, go to 

CVT-114, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

ISOLT2

Release your foot from the accelerator pedal.

0.8 A

Press the accelerator pedal all the way down.

0.0 A

BCIA0031E

DTC P0745 LINE PRESSURE SOLENOID VALVE

CVT-113

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Wiring Diagram — CVT — LPSV

NCS0015I

TCWA0249E

CVT-114

DTC P0745 LINE PRESSURE SOLENOID VALVE

Revision: 2006 July

2007 Murano

TCM terminal data are reference values, measured between each terminal and ground.

Diagnostic Procedure

NCS0015J

1. 

 CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

3.

Read out the value of “ISOLT2”.

 Without CONSULT-II

1.

Start engine.

2.

Check voltage between TCM connector terminal and ground.

3.

Turn ignition switch OFF.

4.

Disconnect TCM connector.

5.

Check if there is continuity between connector terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 2.

Terminal

Wire color

Item

Condition

Data (Approx.)

1

R/Y

Pressure control 
solenoid valve A 
(Line pressure 
solenoid valve)

and

 Release your foot from the accelerator pedal.

5.0 – 7.0 V

 Press the accelerator pedal all the way down.

1.0 – 3.0 V

Item name

Condition

Display value (Approx.)

ISOLT2

Release your foot from 
the accelerator pedal.

0.8 A

Press the accelerator 
pedal all the way down.

0.0 A

SCIA2349E

Name

Connector

Terminal

Condition

Voltage 

(Approx.)

Pressure 
control 
solenoid 
valve A 
(Line pres-
sure sole-
noid valve)

F103

1 – Ground

Release your foot from 
the accelerator pedal.

 5.0 – 7.0 V

Press the accelerator 
pedal all the way down.

1.0 – 3.0 V

SCIA2348E

DTC P0745 LINE PRESSURE SOLENOID VALVE

CVT-115

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2. 

CHECK PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect TCM connector.

3.

Check resistance between TCM connector terminal and ground.

OK or NG

OK >> GO 

TO 

5.

NG

>> GO TO 3.

3. 

CHECK VALVE RESISTANCE

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between CVT unit harness connector terminal
and ground.

OK or NG

OK >> GO 

TO 

4.

NG

>> Replace the transaxle assembly. Refer to 

CVT-215,

"Removal and Installation"

 .

4. 

 CHECK HARNESS BETWEEN TCM AND PRESSURE CONTROL SOLENOID VALVE A (LINE PRES-

SURE SOLENOID VALVE)

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit harness connector and TCM connector.

3.

Check continuity between TCM connector terminal and CVT unit
harness connector terminal.

4.

If OK, check harness for short to ground and short to power.

5.

If OK, check continuity between ground and CVT assembly.

6.

Reinstall any part removed.

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. 

CHECK DTC

Perform 

CVT-112, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

Solenoid valve

Connector

Terminal

Resistance 

(Approx.)

Pressure control solenoid valve A 
(Line pressure solenoid valve) 

F103

1 – Ground

3.0 – 9.0 

Ω

SCIA4685E

Solenoid valve

Connector

Terminal

Resistance 

(Approx.)

Pressure control solenoid valve A 
(Line pressure solenoid valve) 

F6

2 – Ground

3.0 – 9.0 

Ω

SCIA4686E

Item

Connector

Terminal

Continuity

TCM connector

F103

1

Yes

CVT unit harness connector

F6

2

SCIA4687E

CVT-116

DTC P0745 LINE PRESSURE SOLENOID VALVE

Revision: 2006 July

2007 Murano

6. 

CHECK TCM

1.

Check TCM input/output signals. Refer to 

CVT-53, "TCM Input/Output Signal Reference Values"

 .

2.

If NG, re-check TCM pin terminals for damage or loose connection with harness connector.

OK or NG

OK

>> INSPECTION END

NG

>> 1. Repair or replace damaged parts.

2. Replace the transaxle assembly. Refer to 

CVT-215, "Removal and Installation"

 .

Component Inspection

NCS0015K

PRESSURE CONTROL SOLENOID VALVE A (LINE PRESSURE SOLENOID VALVE)

1.

Turn ignition switch OFF.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between CVT unit harness connector terminal
and ground.

4.

If NG, replace the transaxle assembly. Refer to 

CVT-215,

"Removal and Installation"

 .

Solenoid valve

Connector

Terminal

Resistance 

(Approx.)

Pressure control solenoid valve A 
(Line pressure solenoid valve) 

F6

2 – Ground

3.0 – 9.0 

Ω

SCIA4686E

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRES-

SURE SOLENOID VALVE)

CVT-117

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DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRES-
SURE SOLENOID VALVE)

PFP:31941

Description

NCS0015L

The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pres-
sure to suit the driving condition in response to a signal sent from the TCM.

CONSULT-II Reference Value

NCS0015M

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS0015N

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P0746 PRS CNT SOL/A FCTN” with CONSULT-II is detected under the following
conditions.

–

Unexpected gear ratio was detected in the LOW side due to excessively low line pressure.

Possible Cause

NCS0015O

●

Line pressure control system

●

Output speed sensor (Secondary speed sensor)

●

Input speed sensor (Primary speed sensor)

DTC Confirmation Procedure

NCS0015P

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Start engine and maintain the following conditions for at least 10
consecutive seconds. Test start from 0 km/h (0 MPH).
ATF TEMP SEN: 1.0 – 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.

3.

If DTC is detected, go to 

CVT-118, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

PRI PRESS

“N” position idle

0.3 – 0.9 MPa

BCIA0031E

CVT-118

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRES-

SURE SOLENOID VALVE)

Revision: 2006 July

2007 Murano

Diagnostic Procedure

NCS0015Q

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

3.

Start vehicle and read out the value of “PRI PRESS”.

 Without CONSULT-II

1.

Start engine.

2.

Check voltage between TCM connector terminal and ground.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 2.

2. 

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

CVT-43, "LINE PRESSURE

TEST"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts. Refer to 

CVT-44,

"Judgment of Line Pressure Test"

 .

3. 

DETECT MALFUNCTIONING ITEM

Check Pressure control solenoid valve A (line pressure solenoid valve). Refer to 

CVT-116, "Component

Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

Item name

Condition

Display value (Approx.)

PRI PRESS

“N” position idle

0.3 – 0.9 MPa

SCIA2366E

Name

Connector

Terminal

Condition

Voltage 

(Approx.)

Transmission 
fluid pressure 
sensor B (Pri-
mary pressure 
sensor)

F104

41 – Ground

“N” position idle

0.7 – 3.5 V

SCIA1922E

SAT494G

DTC P0746 PRESSURE CONTROL SOLENOID A PERFORMANCE (LINE PRES-

SURE SOLENOID VALVE)

CVT-119

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4. 

CHECK OUTPUT SPEED SENSOR (SECONDARY SPEED SENSOR) SYSTEM AND INPUT SPEED 

SENSOR (PRIMARY SPEED SENSOR) SYSTEM

Check output speed sensor (secondary speed sensor) system and input speed sensor (primary speed sensor)
system. Refer to 

CVT-94, "DTC P0720 VEHICLE SPEED SENSOR CVT (SECONDARY SPEED SENSOR)"

 ,

CVT-89, "DTC P0715 INPUT SPEED SENSOR CIRCUIT (PRI SPEED SENSOR)"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

5. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

Power supply and ground circuit for TCM. Refer to 

CVT-150, "Wiring Diagram — CVT — POWER"

 .

●

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

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace damaged parts.

6. 

CHECK DTC

Perform 

CVT-117, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace the transaxle assembly or TCM. Refer to 

CVT-215, "Removal and Installation"

 .

CVT-120

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRES-

SURE SOLENOID VALVE)

Revision: 2006 July

2007 Murano

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRES-
SURE SOLENOID VALVE)

PFP:31941

Description

NCS0015R

The pressure control solenoid valve B (secondary pressure solenoid valve) regulates the secondary pressure
to suit the driving condition in response to a signal sent from the TCM.

CONSULT-II Reference Value

NCS0015S

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS0015T

●

This is an OBD-II self-diagnostic item. 

●

Diagnostic trouble code “P0776 PRS CNT SOL/B FCTN” with CONSULT-II is detected when secondary
pressure is too high or too low compared with the commanded value while driving.

Possible Cause

NCS0015U

●

Harness or connectors
(Solenoid circuit is open or shorted.)

●

Pressure control solenoid valve B (Secondary pressure solenoid valve system)

●

Transmission fluid pressure sensor A (Secondary pressure sensor)

●

Line pressure control system

DTC Confirmation Procedure

NCS0015V

CAUTION:

Always drive vehicle at a safe speed.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

2.

Start engine and maintain the following conditions for at least 30
consecutive seconds.
ATF TEMP SEN: 1.0 – 2.0 V
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
VEHICLE SPEED: 10 km/h (6 MPH) More than
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.

3.

If DTC is detected, go to 

CVT-121, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

SEC PRESS

“N” position idle

0.5 – 0.9 MPa

BCIA0031E

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRES-

SURE SOLENOID VALVE)

CVT-121

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Diagnostic Procedure

NCS0015W

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.

3.

Start vehicle and read out the value of “SEC PRESS”.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 2.

2. 

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

CVT-43, "LINE PRESSURE

TEST"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts. Refer to 

CVT-44,

"Judgment of Line Pressure Test"

 .

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

Pressure control solenoid valve B (Secondary pressure solenoid valve). Refer to 

CVT-127, "Component

Inspection"

 .

●

Pressure control solenoid valve A (Line pressure solenoid valve). Refer to 

CVT-116, "Component Inspec-

tion"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK TRANSMISSION FLUID PRESSURE SENSOR A (SECONDARY PRESSURE SENSOR) SYS-

TEM

Check transmission fluid pressure sensor A (secondary pressure sensor) system. Refer to 

CVT-133, "DTC

P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC PRESSURE SENSOR)"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

Item name

Condition

Display value (Approx.)

SEC PRESS

“N” position idle

0.5 – 0.9 MPa

SCIA2366E

SAT494G

CVT-122

DTC P0776 PRESSURE CONTROL SOLENOID B PERFORMANCE (SEC PRES-

SURE SOLENOID VALVE)

Revision: 2006 July

2007 Murano

5. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

Power supply and ground circuit for TCM. Refer to 

CVT-150, "Wiring Diagram — CVT — POWER"

 .

●

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

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace damaged parts.

6. 

CHECK DTC

Perform 

CVT-120, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace the transaxle assembly. Refer to 

CVT-215, "Removal and Installation"

 .

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-

SURE SOLENOID VALVE)

CVT-123

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision: 2006 July

2007 Murano

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRESSURE
SOLENOID VALVE)

PFP:31941

Description

NCS0015X

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

CONSULT-II Reference Value

NCS0015Y

Remarks: Specification data are reference values.

On Board Diagnosis Logic

NCS0015Z

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P0778 PRS CNT SOL/B CIRC” with CONSULT-II is detected under the following
conditions.

–

TCM detects an improper voltage drop when it tries to operate the solenoid valve.

–

When TCM compares target value with monitor value and detects an irregularity.

Possible Cause

NCS00160

●

Harness or connectors
(Solenoid circuit is open or shorted.)

●

Pressure control solenoid valve B (Secondary pressure solenoid valve)

DTC Confirmation Procedure

NCS00161

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.

3.

Start engine and wait at least 5 seconds.

4.

If DTC is detected, go to 

CVT-125, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Item name

Condition

Display value (Approx.)

ISOLT3

Secondary pressure low – Secondary pressure high

0.8 – 0.0 A

SOLMON3

“N” position idle

0.6 – 0.7 A

When stalled

0.4 – 0.6 A

BCIA0031E

CVT-124

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-

SURE SOLENOID VALVE)

Revision: 2006 July

2007 Murano

Wiring Diagram — CVT — SECPSV

NCS00162

TCWA0250E