Nissan Murano Z50 (2003 year). Manual - part 70

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

CVT-161

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

PFP:23710

Description

ACS002KG

Electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throttle
position sensor etc. The actuator sends a signal to the ECM, and ECM sends signals to TCM with CAN com-
munication.

On Board Diagnosis Logic

ACS002U5

●

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

●

Diagnostic trouble code “ELEC TH CONTROL·” with CONSULT-II is detected when the electronically con-
trolled throttle for ECM is malfunctioning.

Possible Cause

ACS002KI

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

DTC Confirmation Procedure

ACS002KJ

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”. (Do not start engine.)

2.

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

3.

Start engine and let it idle for 5 second.

4.

If DTC is detected, go to 

CVT-161, "Diagnostic Procedure"

 .

Diagnostic Procedure

ACS002KK

1. 

CHECK DTC WITH ECM 

 With CONSULT-II

1.

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

2.

Select “SELF-DIAG RESULTS” mode for “ENGINE” with CON-
SULT-II. Refer to 

EC-125, "CONSULT-II Function"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Check the DTC Detected Item. Refer to 

EC-125, "CON-

SULT-II Function"

 .

●

If CAN communication line is detected, go to 

CVT-76,

"DTC U1000 CAN COMMUNICATION LINE"

 .

SCIA2272E

SCIA2272E

CVT-162

DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM

Revision; 2004 April

2003 Murano

2. 

CHECK DTC

Perform DTC Confirmation Procedure.

●

Refer to 

CVT-161, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING ITEM

Check the following:

●

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

OK or NG

OK

>> Replace the TCM. Refer to 

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

 .

NG

>> Repair or replace damaged parts.

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

CVT-163

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

PFP:31941

Description

ACS002U6

●

Lock-up select solenoid valve switches, which controls lock-up clutch pressure or forward clutch pressure
(reverse brake pressure).

●

When controlling lock-up clutch, turns OFF. When controlling forward clutch, turns ON.

CONSULT-II Reference Value

ACS002KM

On Board Diagnosis Logic

ACS002KN

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “LU-SLCT SOL/CIRC” with CONSULT-II or P1740 without CONSULT-II is
detected under the following conditions.

–

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

Possible Cause

ACS002KO

●

Lock-up select solenoid valve

●

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

DTC Confirmation Procedure

ACS002U7

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”. (Do not start engine.)

2.

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

3.

Start engine and maintain the following conditions for at least 5
consecutive seconds.
SELECTOR LEVER: “D” position and “N” position 
(At each time, wait for 5 seconds.)

4.

If DTC is detected, go to 

CVT-165, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

Item name

Condition 

Display value 

LUSEL SOL OUT

N position 

ON

Wait at least for 5 seconds with the selector 

lever in D position

OFF

SCIA2272E

CVT-164

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

Revision; 2004 April

2003 Murano

Wiring Diagram - CVT - L/USSV

ACS002U8

TCWA0154E

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

CVT-165

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

Remarks: Specification data are reference values.

Diagnostic Procedure

ACS002U9

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

>> Replace the transaxle assembly. Refer to 

CVT-197,

"Removal and Installation"

 .

2. 

CHECK POWER SOURCE CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect TCM 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 open circuit or short to ground or short to power in harness or connectors.

3. 

CHECK DTC

Check again.

●

Refer to 

CVT-163, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 4.

4. 

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

>> INSPECTION END 

NG

>> 1. Repair or replace damaged parts.

2. Replace the TCM. Refer to 

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

 .

Terminal 

No.

Wire color

Item

Condition

Judgement standard

(Approx.)

4

L/Y

Lock-up select 
solenoid valve

N position 

Battery voltage

Wait at least for 5 seconds with the selector lever in D position.

0V

Solenoid Valve

Connector 

No.

Terminal No. 

Resistance 

(Approx.)

Lock-up select 
solenoid valve

F6

13 - Ground

6.0 - 19.0 

Ω

SCIA2038E

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F103

4 (L/Y)

Yes

CVT unit harness connector

F6

13 (L/Y)

SCIA2039E

CVT-166

DTC P1740 LOCK-UP SELECT SOLENOID VALVE CIRCUIT

Revision; 2004 April

2003 Murano

Component Inspection

ACS002UA

LOCK-UP SELECT 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.)

Lock-up select 
solenoid valve

F6

13 - Ground

6.0 - 19.0 

Ω

SCIA2038E

DTC P1745 LINE PRESSURE CONTROL

CVT-167

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

DTC P1745 LINE PRESSURE CONTROL

PFP:31036

Description

ACS002KR

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.

On Board Diagnosis Logic

ACS002UB

●

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

●

Diagnostic trouble code “L/PRESS CONTROL” with CONSULT-II is detected when TCM detects the unex-
pected line pressure.

Possible Cause

ACS002KT

●

TCM

DTC Confirmation Procedure

ACS002UC

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, 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.

Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
FLUID TEMP SEN: 1.0 - 2.0V
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)
If the check result is NG, go to “Diagnostic Procedure”, 

CVT-167

.

Diagnostic Procedure

ACS002UD

1. 

CHECK DTC 

1.

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

2.

Select SELF-DIAG RESULTS item at SELECT DIAG MODE.

3.

Erase self-diagnostic results. Refer to 

CVT-47, "HOW TO

ERASE DTC (WITH CONSULT-II)"

 .

4.

Turn ignition switch OFF, and wait for 5 seconds or more.

5.

Start engine.

6.

Confirm self-diagnostic results again. Refer to 

CVT-71, "Self-

Diagnostic Result Test Mode"

 .

Is the line pressure control displayed?

YES

>> Replace the TCM. Refer to 

CVT-8, "Precautions for

TCM and CVT Assembly Replacement"

 .

NO

>> INSPECTION END

SCIA2272E

SCIA5492E

CVT-168

DTC P1777 STEP MOTOR - CIRCUIT

Revision; 2004 April

2003 Murano

DTC P1777 STEP MOTOR - CIRCUIT

PFP:31020

Description

ACS00216

●

The step motor changes the step with turning  4 coils ON/OFF according to the signal from TCM.
As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.

CONSULT-II Reference Value

ACS0032M

Remarks: Specification data are reference values.

On Board Diagnosis Logic

ACS0032N

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “STEP MOTOR/CIRC” with CONSULT-II or P1777 without CONSULT-II is
detected under the following conditions.

–

When in operating step motor ON and OFF, there is no proper change in the voltage of the terminal TCM
which corresponds to it.

Possible Cause

ACS0032O

●

Step motor

●

Harness or connectors
(The step motor circuit is open or shorted.)

DTC Confirmation Procedure

ACS0032P

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 5 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
“TRANMISSION” with CONSULT-II.

Monitor item

Condition

Specification

STM STEP

The vehicle runs a safe condition and 
press/depress accelerator pedal.

-20 step - 190 step

SMCOIL A

Changes ON

⇔

OFF.

SMCOIL B

Changes ON

⇔

OFF.

SMCOIL C

Changes ON

⇔

OFF.

SMCOIL D

Changes ON

⇔

OFF.

SCIA2272E

DTC P1777 STEP MOTOR - CIRCUIT

CVT-169

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

2.

Drive vehicle for at least 5 consecutive seconds.
If the check result is “NG”, go to 

CVT-171, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

SCIA5492E

CVT-170

DTC P1777 STEP MOTOR - CIRCUIT

Revision; 2004 April

2003 Murano

Wiring Diagram — CVT — STM

ACS00217

TCWA0158E

DTC P1777 STEP MOTOR - CIRCUIT

CVT-171

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

Remarks: Specification data are reference values.

Diagnostic Procedure

ACS00218

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Start engine.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-II.

3.

Vehicle start and read out the value of “STM STEP”, “SMCOIL A”, “SMCOIL B”, “SMCIOL C”, and
“SMCOIL D”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK STEP MOTOR CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect CVT unit connector and TCM 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.

If OK, check continuity between body ground and CVT assembly.

6.

Reinstall any part removed.

OK or NG

OK

>> GO TO 3.

NG

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

3. 

CHECK STEP MOTOR

Check step motor Refer to 

CVT-172, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace damaged parts.

Terminal 

No.

Wire color

Item

Condition

Judgement standard 

(Approx.)

11

G/R

Step motor

Within 2 seconds after key switch “ON”, check the time measure-
ment by using the pulse width measurement function (Hi level) of 
CONSULT-II.

●

CONSULT-II cable connect to data link connector.

●

This inspection cannot be measured by circuit tester.

30.0 msec

12

O/B

10.0 msec

20

R

30.0 msec

21

R/G

10.0 msec

Item

Connector No.

Terminal No. 

(Wire color)

Continuity

TCM

F103

11 (G/R)

Yes

CVT unit harness connector

F6

6 (G/R)

TCM

F103

12 (O/B)

Yes

CVT unit harness connector

F6

7 (O/B)

TCM

F103

20 (R)

Yes

CVT unit harness connector

F6

8 (R)

TCM

F103

21 (R/G)

Yes

CVT unit harness connector

F6

9 (R/G)

SCIA3704E

CVT-172

DTC P1777 STEP MOTOR - CIRCUIT

Revision; 2004 April

2003 Murano

4. 

CHECK DTC

Check again.

●

Refer to 

CVT-168, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 5.

5. 

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

>> Repair or replace damaged parts.

Component Inspection

ACS00219

STEP MOTOR

1.

Turn ignition switch “OFF”.

2.

Disconnect CVT unit harness connector.

3.

Check resistance between terminals.

4.

If NG, replace transaxle assembly. Refer to 

CVT-197, "Removal and Installation"

 .

Control valve

Connector No.

Terminal No.

Resistance 

(Approx.)

Step motor

F6

6 - 7

30

Ω

8 - 9

6 - Ground

15

Ω

7 - Ground

8 - Ground

9 - Ground

SCIA2040E

DTC P1778 STEP MOTOR - FUNCTION

CVT-173

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

DTC P1778 STEP MOTOR - FUNCTION

PFP:31947

Description

ACS0021D

●

The step motor's 4 aspects of ON/OFF change according to the signal from TCM.
As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled.

●

This diagnosis item detects when electrical system is OK, but mechanical system is NG.

●

This diagnosis item detects when the state of the changing the speed mechanism in unit does not operate
normally.

CONSULT-II Reference Value

ACS0032Q

Remarks: Specification data are reference values.

On Board Diagnosis Logic

ACS0032R

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “STEP MOTOR/FNCTN” with CONSULT-II or P1778 without CONSULT-II is
detected under the following conditions.

–

When not changing the pulley ratio according to the instruction of TCM.

Possible Cause

ACS0032S

●

Step motor

DTC Confirmation Procedure

ACS0032T

CAUTION:

●

Always drive vehicle at a safe speed.

●

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

●

Before starting “DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE”, confirm
“Hi” or “Mid” or “Low” fixation by “PRI SPEED” and “VEHICLE SPEED” on “DATA MONITOR
MODE”.

●

If hi-geared fixation, go to diagnostic procedure soon.

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, 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.

Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
FLUID TEMP SEN: 1.0 - 2.0V
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)

Monitor item

Condition

Specification (Approximately)

STM STEP

The vehicle runs a safe condi-
tion and press/depress acceler-
ator pedal.

-20 step - 190 step

GEAR RATIO

2.37 - 0.43

SCIA2272E

CVT-174

DTC P1778 STEP MOTOR - FUNCTION

Revision; 2004 April

2003 Murano

3.

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

4.

Start engine and maintain the following conditions for at least 30
consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1/8
Selector lever: D position
ENG SPEED: 450 rpm or more
If the check result is NG, GO TO 

CVT-174, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “With CONSULT-II”.

Diagnostic Procedure

ACS0032U

1. 

CHECK STEP MOTOR

●

It is monitoring whether “CVT ratio: 2.37 - 0.43” changes similarly to “STM STEP: -20 - 190” by DATA
MONITOR mode.

●

If no CONSULT-II, inspect the engine speed (rise and descend), vehicle speed, throttle opening angle,
and check shift change.

OK or NG

OK

>> INSPECTION END

NG

>> Replace the transaxle assembly. Refer to 

CVT-197, "Removal and Installation"

 .

SCIA5492E

SECOND POSITION SWITCH

CVT-175

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

SECOND POSITION SWITCH

PFP:34910

Description

ACS0032V

Second position switch is built into CVT control device.
When selector lever is in “S” or “L” positions, second position switch turns ON and sends a signal to unified
meter and A/C amp. 
Then signal is transferred to TCM with CAN communications to improve engine brake performance.

CONSULT-II Reference Value

ACS00332

Remarks: Specification data are reference values.

Possible Cause

ACS0032Y

●

Harness or connectors
(These switch circuits are open or shorted.)

●

Second position switch (Into control device)

Monitor item

Condition

Specification

SECOND POS SW

Selector lever in “S” position

ON

Other than the above (except “L” position)

OFF

CVT-176

SECOND POSITION SWITCH

Revision; 2004 April

2003 Murano

Wiring Diagram — CVT — SPSW

ACS00333

TCWA0162E