Nissan Murano Z50 (2003 year). Manual - part 68

DTC P0776 PRESSURE CONTROL SOLENOID B PERFOMANCE (SEC PRES-

SURE SOLENOID VALVE)

CVT-129

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CVT

Revision; 2004 April

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If the check result is NG, go to “Diagnostic Procedure”, 

CVT-129

.

 WITH GST

Follow the procedure “With CONSULT-II”.

Diagnostic Procedure

ACS002TE

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-57, "LINE PRESSURE TEST"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts. Refer to 

CVT-58, "Judgement of Line Pressure Test"

 .

3. 

DETECT MALFUNCTIONING ITEM

Check the following:

●

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

CVT-134, "Component

Inspection"

 .

●

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

CVT-124, "Component Inspec-

tion"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

4. 

CHECK SECONDARY PRESSURE SENSOR SYSTEM

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

CVT-135, "DTC P0840

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

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts.

SCIA5492E

Monitor item

Condition

Specification (Approximately)

SEC PRESS

N position idle

0.5MPa

SCIA2366E

CVT-130

DTC P0776 PRESSURE CONTROL SOLENOID B PERFOMANCE (SEC PRES-

SURE SOLENOID VALVE)

Revision; 2004 April

2003 Murano

5. 

DETECT MALFUNCTIONING ITEM

Check the following:

●

Power supply and ground circuit for TCM.

●

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 DTC Confirmation Procedure.

●

Refer to 

CVT-128, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace the transaxle assembly. Refer to 

CVT-197, "Removal and Installation"

 .

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-

SURE SOLENOID VALVE)

CVT-131

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CVT

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

PFP:31941

Description

ACS002J9

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.
The secondary pressure duty cycle value is not consistent when the closed throttle position signal is
“ON”. To confirm the secondary pressure duty cycle at low-pressure, the accelerator (throttle) should
be open until the closed throttle position signal is “OFF”.

NOTE:
CONSULT-II screen terms are shown differently depending on the version of CONSULT-II card.

CONSULT-II Reference Value

ACS002TF

Remarks: Specification data are reference values.

On Board Diagnosis Logic

ACS002JA

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “SEC/PRESS SOL/CIRC” with CONSULT-II or P0778 without CONSULT-II is
detected under the following conditions.

–

When 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

ACS002JB

●

Harness or connectors
(The solenoid circuit is open or shorted.)

●

Pressure control solenoid valve B (secondary pressure solenoid valve)

DTC Confirmation Procedure

ACS002JC

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-133, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

Monitor item

Condition

Specification (Approximately)

ISOLT3

N position idle

0.6 - 0.7A

When stalled

0.4 - 0.6A

SOLMON3

N position idle

0.6 - 0.7A

When stalled

0.4 - 0.6A

SCIA2272E

CVT-132

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-

SURE SOLENOID VALVE)

Revision; 2004 April

2003 Murano

Wiring Diagram — CVT — SECPSV

ACS002TG

TCWA0152E

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-

SURE SOLENOID VALVE)

CVT-133

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2003 Murano

Remarks: Specification data are reference values.

Diagnostic Procedure

ACS002TH

1. 

CHECK VALVE RESISTANCE

1.

Turn ignition switch “OFF”.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between terminal and ground.

OK or NG

OK >> GO 

TO 

2.

NG

>> Repair or replace damaged parts.

2. 

CHECK POWER SOURCE CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect TCM connector and CVT unit harness connector.

3.

Check continuity between CVT unit harness connector and TCM
connector.

4.

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

5.

Reinstall any part removed.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

CHECK DTC

Check again.

●

Refer to 

CVT-131, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 4.

Terminal 

No.

Wire color

Item

Condition

Judgement standard

(Approx.)

2

W/B

Pressure control 
solenoid valve B 
(secondary pres-
sure solenoid valve)

Release your foot from the accelera-
tor pedal.

5.0 - 7.0V

Press the accelerator pedal all the 
way down.

3.0 - 4.0V

Solenoid Valve

Connector No.

Terminal No.

Resistance 

(Approx.)

Pressure control sole-
noid valve B (secondary 
pressure solenoid valve) 

F6

3 - Ground

3.0 - 9.0 

Ω

SCIA2032E

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM connector

F103

2 (W/B)

Yes

CVT unit harness connector

F6

3 (W/B)

SCIA2033E

CVT-134

DTC P0778 PRESSURE CONTROL SOLENOID B ELECTRICAL (SEC PRES-

SURE SOLENOID VALVE)

Revision; 2004 April

2003 Murano

4. 

CHECK TCM INSPECTION

1.

Perform TCM input/output signal inspection.

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-197, "Removal and Installation"

 .

Component Inspection

ACS002TI

PRESSURE CONTROL SORENOID VALVE B (SECONDARY PRESSURE SOLENOID VALVE)

1.

Turn ignition switch “OFF”.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between terminal and ground.

4.

If NG, replace transaxle assembly. Refer to 

CVT-197, "Removal

and Installation"

 .

Solenoid Valve

Connector No.

Terminal No.

Resistance 

(Approx.)

Pressure control sole-
noid valve B (secondary 
pressure solenoid valve) 

F6

3 - Ground

3.0 - 9.0 

Ω

SCIA2032E

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC 

PRESSURE SENSOR)

CVT-135

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CVT

Revision; 2004 April

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

PFP:31936

Description

ACS002JM

The transmission fluid pressure sensor A (secondary pressure sensor) detects secondary pressure of CVT
and sends TCM the signal.

NOTE:
CONSULT-II screen terms are shown differently depending on the version of CONSULT-II card.

CONSULT-II Reference Value

ACS002TJ

Remarks: Specification data are reference values.

On Board Diagnosis Logic

ACS002TK

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “SEC PRS SEN/CIRC” with CONSULT-II or P0840 without CONSULT-II is
detected when TCM detects an improper voltage drop when it tries to operate the sensor.

Possible Cause

ACS002JO

●

Transmission fluid pressure sensor A (secondary pressure sensor)

●

Harness or connectors
(The switch circuit is open or shorted.)

DTC Confirmation Procedure

ACS002JP

CAUTION:

●

Always drive vehicle at a safe speed.

●

Be careful not to rev engine into the red zone on the tachometer.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 5 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.

Make sure that output voltage of line temperature sensor is
within the range below.
ATF TEMP SEN: 1 - 2V
If 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)

3.

Start engine and wait for at least 5 consecutive seconds.
If the check result is NG, go to “Diagnostic Procedure”, 

CVT-137,

"Diagnostic Procedure"

 .

WITH GST

Follow the procedure “With CONSULT-II”.

Monitor item

Condition

Specification (Approximately)

SEC HYDR SEN

N position idle

0.8V

SEC PRS

During driving [40km/h (25 MPH)]

0.4MPa

SCIA2272E

CVT-136

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC 

PRESSURE SENSOR)

Revision; 2004 April

2003 Murano

Wiring Diagram - CVT - SECPS

ACS002TL

TCWA0155E

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC 

PRESSURE SENSOR)

CVT-137

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Revision; 2004 April

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Remarks: Specification data are reference values.

Diagnostic Procedure

ACS002JQ

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

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

3.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 2.

2. 

CHECK SENSOR POWER AND SENSOR GROUND

1.

Turn ignition switch “ON”. (Do not start engine)

2.

Check voltage between TCM connector 46 and 42.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

Terminal 

No.

Wire color

Item

Condition

Judgement standard

(Approx.)

37

V/W

Transmission fluid 
pressure sensor A 
(secondary pressure 
sensor)

N position idle

0.8V

SCIA2279E

Item

Connector No.

Terminal No.

 (Wire color)

Data (Approx.)

TCM connector

F104

46 (L/O) - 42 (W/R) 

5V

SCIA2367E

CVT-138

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC 

PRESSURE SENSOR)

Revision; 2004 April

2003 Murano

3. 

CHECK THE HARNESS BETWEEN TCM AND CVT UNIT HARNESS CONNECTOR (SENSOR POWER 

AND SENSOR GROUND)

1.

Turn ignition switch “OFF”.

2.

Disconnect the TCM connector and CVT unit harness connector.

3.

Check continuity between TCM connector and CVT unit harness
connector.

4.

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

5.

Reinstall any part removed.

OK or NG

OK

>> Replace the TCM. Refer to 

CVT-8, "Precautions for TCM and CVT Assembly Replacement"

 .

NG

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

4. 

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

CUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect TCM connector and CVT unit harness connector.

3.

Check continuity between CVT unit harness connector and TCM
connector.

4.

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

5.

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 DTC Confirmation Procedure.

●

Refer to 

CVT-135, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F104

42 (W/R)

Yes

CVT unit harness connector

F6

19 (W/R)

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F104

46 (L/O)

Yes

CVT unit harness connector

F6

20 (L/O)

SCIA2340E

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F104

37 (V/W)

Yes

CVT unit harness connector

F6

23 (V/W)

SCIA2368E

DTC P0840 TRANSMISSION FLUID PRESSURE SENSOR A CIRCUIT (SEC 

PRESSURE SENSOR)

CVT-139

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Revision; 2004 April

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6. 

PERFORM TCM INSPECTION

1.

Perform TCM input/output signal inspection.

2.

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

OK or NG

OK

>> Replace the transaxle assembly. Refer to 

CVT-197, "Removal and Installation"

 .

NG

>> Repair or replace damaged parts.

CVT-140

DTC P0841 PRESSURE SENSOR FUNCTION

Revision; 2004 April

2003 Murano

DTC P0841 PRESSURE SENSOR FUNCTION

PFP:31936

Description

ACS002TM

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

CONSULT-II Reference Value

ACS002TN

Remarks: Specification data are reference values.

On Board Diagnosis Logic

ACS002JS

●

This is not an OBD-II self-diagnostic item.

●

Diagnostic trouble code “PRESS SEN/FNCTN” with CONSULT-II is detected when correlation between
the values of the secondary pressure sensor and the primary pressure sensor is out of specification.

Possible Cause

ACS002JT

●

Transmission pressure sensor A (secondary pressure sensor)

●

Transmission pressure sensor B (primary pressure sensor)

●

Harness or connectors
(The sensor circuit is open or shorted.)

DTC Confirmation Procedure

ACS002TO

CAUTION:

●

Always drive vehicle at a safe speed.

●

Be careful not to rev engine into the red zone on the tachometer.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 5 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 12
consecutive seconds.
VHCL SPEED: 40 km/h (25 MPH) More than
Selector lever: D position

Monitor item

Condition

Specification (Approximately)

PRI HYDR SEN

N position idle

0.7V - 1.2V

During driving [40km/h (25 MPH)]

1.0V

SEC HYDR SEN

N position idle

0.8V

During driving

0.7V

SCIA2272E

DTC P0841 PRESSURE SENSOR FUNCTION

CVT-141

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Revision; 2004 April

2003 Murano

If the check result is NG, go to “Diagnostic Procedure”, 

CVT-141

.

Diagnostic Procedure

ACS002TP

1. 

CHECK CAN COMMUNICATION CIRCUIT

Perform the self-diagnosis.

Is any malfunction of the “CAN COMM CIRCUIT” indicated?

YES

>> Refer to 

CVT-76, "DTC U1000 CAN COMMUNICATION LINE"

 .

NO

>> GO TO 2.

2. 

CHECK INPUT SIGNAL (WITH CONSULT-II)

 With CONSULT-II

1.

Start engine.

2.

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

3.

Start vehicle and read out the value of “SEC HYDR SEN” and
“PRI HYDR SEN”.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 4.

3. 

CHECK INPUT SIGNAL (WITHOUT CONSULT-II)

 Without CONSULT-II

1.

Start engine.

2.

Check voltage between TCM connector and ground.

OK or NG

OK >> GO 

TO 

7.

NG

>> GO TO 4.

SCIA5492E

Monitor item

Condition

Specification

(Approximately)

PRI HYDR SEN

N position idle

0.7V - 1.2V

During driving [40km/h (25 MPH)]

1.0V

SEC HYDR SEN

N position idle

0.8V

During driving

0.7V

SCIA2277E

Name

Connector 

No.

Terminal 

No.

Condition

Voltage 

(Approx.)

Transmission pressure 
sensor B (primary pres-
sure sensor)

F104

 41 (V/O) - 

ground

“ N” position 

idle

0.7 - 1.2V

Transmission pressure 
sensor A (secondary 
pressure sensor)

 37 (V/W) - 

ground

0.8V

SCIA1943E

CVT-142

DTC P0841 PRESSURE SENSOR FUNCTION

Revision; 2004 April

2003 Murano

4. 

CHECK LINE PRESSURE

Perform line pressure test. Refer to 

CVT-57, "LINE PRESSURE TEST"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace damaged parts. Refer to 

CVT-58, "Judgement of Line Pressure Test"

 .

5. 

CHECK TRANSMISSION PRESSORE SENSOR A (SECONDARY PRESSURE SENSOR) SYSTEM 

AND TRANSMISSION PRESSURE SENSOR B (PRIMARY PRESSURE SENSOR) SYSTEM

Check secondary pressure sensor system and primary pressure sensor system. Refer to 

CVT-135, "DTC

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

 , 

CVT-143,

"DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRESSURE SENSOR)"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace damaged parts.

6. 

DETECT MALFUNCTIONING ITEM

Check the following:

●

Line pressure solenoid valve. Refer to 

CVT-124, "Component Inspection"

 .

●

Secondary pressure solenoid valve. Refer to 

CVT-134, "Component Inspection"

 .

●

Step motor. Refer to 

CVT-172, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace damaged parts.

7. 

CHECK DTC

Perform DTC Confirmation Procedure.

●

Refer to 

CVT-140, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace the TCM or transaxle assembly. Refer to 

CVT-197, "Removal and Installation"

 .

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI 

PRESSURE SENSOR)

CVT-143

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CVT

Revision; 2004 April

2003 Murano

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI PRES-
SURE SENSOR)

PFP:31936

Description

ACS002TQ

The primary pressure sensor detects primary pressure of CVT and sends TCM the signal.

NOTE:
CONSULT-II screen terms are shown differently depending on the version of CONSULT-II card.

CONSULT-II Reference Value

ACS002TR

Remarks: Specification data are reference values.

On Board Diagnosis Logic

ACS002TS

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “PRI PRS SEN/CIRC” with CONSULT-II or P0845 without CONSULT-II is
detected under the following conditions.

–

When TCM detects an improper voltage drop when it tries to operate the sensor.

–

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

Possible Cause

ACS002TT

●

Transmission fluid pressure sensor B (primary pressure sensor)

●

Harness or connectors
(The sensor circuit is open or shorted.)

DTC Confirmation Procedure

ACS002TU

CAUTION:

●

Always drive vehicle at a safe speed.

●

Be careful not to rev engine into the red zone on the tachometer.

NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 5 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.

Make sure that output voltage of line temperature sensor is
within the range below.
ATF TEMP SEN: 1 - 2V
If 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).

3.

Start engine and wait for at least 5 consecutive seconds.
If the check result is NG, go to “Diagnostic Procedure”, 

CVT-145

.

 WITH GST

Follow the procedure “With CONSULT-II”.

Monitor item

Condition

Specification (Approximately)

PRI HYDR SEN

N position idle

0.7 - 1.2V

During driving [40 km/h (25 MPH)]

1.0V

SCIA2272E

CVT-144

DTC P0845 TRANSMISSION FLUID PRESSURE SENSOR B CIRCUIT (PRI 

PRESSURE SENSOR)

Revision; 2004 April

2003 Murano

Wiring Diagram - CVT - PRIPS

ACS002TV

TCWA0157E