Nissan Murano Z50 (2003 year). Manual - part 63

TROUBLE DIAGNOSIS

CVT-49

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TROUBLE DIAGNOSIS

PFP:00004

DTC Inspection Priority Chart

ACS001SX

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to

CVT-76

 .

Fail-Safe

ACS001SY

The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. 

FAIL-SAFE FUNCTION 

If any malfunction occurs in a sensor or solenoid, this function controls the CVT to make driving possible.

Output Speed Sensor (Secondary Speed Sensor)

●

The shift pattern is changed in accordance with throttle position when an unexpected signal is sent from
the output speed sensor (secondary speed sensor) to the TCM. The Second position is inhibited, and the
transmission is put in “D” if “S” is selected.

Input Speed Sensor (Primary Speed Sensor)

●

The shift pattern is changed in accordance with throttle position and secondary speed (vehicle speed)
when an unexpected signal is sent from the input speed sensor (primary speed sensor) to the TCM. The
Second position is inhibited and the transmission is put in “D” if “S” is selected.

PNP Switch

●

If an unexpected signal is sent from the PNP switch to the TCM, the transmission is put in “D” 

CVT Fluid Temperature Sensor

●

If an unexpected signal is sent from the CVT fluid temperature sensor to the TCM, the gear ratio in use
before receiving the unexpected signal is maintained or the gear ratio is controlled to keep engine speed
under 5000 rpm.

Transmission Fluid Pressure Sensor A (Secondary Pressure Sensor)

●

If an unexpected signal is sent from the transmission fluid pressure sensor A (secondary pressure sensor)
to the TCM, the secondary pressure feedback control is stopped and the offset value obtained before the
non-standard condition occurs is used to control line pressure.

●

If transmission fluid pressure sensor A (secondary pressure sensor) error signal is input to TCM, second-
ary pressure feedback control stops, but line pressure is controlled normally.

Pressure Control Solenoid A (Line Pressure Solenoid)

●

If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid A (line pres-
sure solenoid) is turned “off” to achieve the maximum fluid pressure.

Pressure Control Solenoid B (Secondary Pressure Solenoid)

●

If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid B (secondary
pressure solenoid) is turned “off” to achieve the maximum fluid pressure.

Torque Converter Clutch Solenoid

●

If an unexpected signal is sent from the solenoid to the TCM, the torque converter clutch solenoid is
turned “off” to cancel the lock-up.

Step Motor

●

If an unexpected signal is sent from the step motor to the TCM, the step motor coil phases “A” through “D”
are all turned “off” to hold the gear ratio used right before the non-standard condition occurred.

Priority

Detected items (DTC)

1

U1000 CAN communication line

2

Except above

CVT-50

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CVT Lock-Up Select Solenoid

●

If an unexpected signal is sent from the solenoid to the TCM, the lock-up select solenoid is turned “off” to
cancel the lock-up.

How To Perform Trouble Diagnosis For Quick and Accurate Repair

ACS001SZ

INTRODUCTION

The TCM receives a signal from the vehicle speed sensor, PNP switch and provides shift control or lock-up
control via CVT solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
CVT system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the CVT system. The CVT system must be in good
operating condition and be free of valve seizure, solenoid valve mal-
function, etc.

It is much more difficult to diagnose an error that occurs intermit-
tently rather than continuously. Most intermittent errors are caused
by poor electric connections or improper wiring. In this case, careful
checking of suspected circuits may help prevent the replacement of
good parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II (or GST) or a circuit tester connected should be
performed. Follow the 

CVT-51, "WORK FLOW"

 .

Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a drivability complaint. The customer
can supply good information about such errors, especially intermit-
tent ones. Find out what symptoms are present and under what con-
ditions they occur. A “Diagnostic Worksheet” as shown on the
example (Refer to 

CVT-52

 ) should be used.

Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot drivability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.

SAT631IB

SAT632I

SEF234G

TROUBLE DIAGNOSIS

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WORK FLOW

A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.
Make good use of the two sheets provided, “Information From Customer” (Refer to 

CVT-52

 ) and “Diagnostic

Worksheet” (Refer to 

CVT-52

 ), to perform the best troubleshooting possible.

Work Flow Chart

*1.

CVT-52

*2.

CVT-52

*3.

CVT-49

*4.

CVT-56

*5.

CVT-56

, 

CVT-57

*6.

CVT-59

*7.

CVT-66

*8.

CVT-45

*9.

CVT-75

*10.

CVT-76

*11.

CVT-173

*12.

CVT-178

*13.

CVT-76

*14.

CVT-173

*15.

EC-69

SCIA1973E

CVT-52

TROUBLE DIAGNOSIS

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DIAGNOSTIC WORKSHEET
Information from Customer

KEY POINTS

●

WHAT..... Vehicle & CVT model

●

WHEN..... Date, Frequencies

●

WHERE..... Road conditions

●

HOW..... Operating conditions, Symptoms

Diagnostic Worksheet Chart

Customer name

MR/MS

Model & Year

VIN

Trans. Model

Engine

Mileage

malfunction Date

Manuf. Date

In Service Date

Frequency

❏

 Continuous

❏

 Intermittent (

times a day)

Symptoms

❏

 Vehicle does not move.

(

❏

 Any position

❏

 Particular position)

❏

 No shift

❏

 Lock-up malfunction

❏

 Shift shock or slip

(

❏

 N 

→

 D

❏

 N 

→

 R

❏

 Lock-up

❏

 Any drive position)

❏

 Noise or vibration

❏

 No pattern select

❏

 Others

(

)

Malfunction indicator lamp (MIL)

❏

 Continuously lit

❏

 Not lit

1

❏

 Read the item on “cautions concerning fail-safe and understand the customer's complaint.

CVT-49

2

❏

 CVT fluid inspection

CVT-56

❏

 Leak (Repair leak location.)

❏

 State

❏

 Amount

3

❏

 Stall test and line pressure test

CVT-56

, 

CVT-57

❏

 Stall test

❏

 Torque converter one-way clutch

❏

 Reverse brake

❏

 Forward clutch

❏

 Steel belt

❏

 Engine

❏

 Line pressure low

❏

 Primary pulley

❏

 Secondary pulley

❏

 Line pressure inspection - Suspected part:

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4

❏

 perform all road tests and enter checks in required inspection items.

CVT-59

4-1.

Check before engine is started 

❏

 perform self-diagnostics. Enter checks for detected items.

❏

 Output speed sensor (secondary speed sensor). 

CVT-101

 .

❏

 Input speed sensor (primary speed sensor). 

CVT-95

 .

❏

 TCC solenoid valve. 

CVT-112

 .

❏

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

CVT-120

 .

❏

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

CVT-131

 .

❏

 Transmission fluid pressure sensor A (secondary pressure sensor).

CVT-135

 .

❏

 Transmission fluid pressure sensor B (primary pressure sensor).

CVT-143

 .

❏

 Lock-up select solenoid valve. 

CVT-163

 .

❏

 Step motor. 

CVT-168

 .

❏

 PNP switch. 

CVT-85

 .

❏

 CVT fluid temperature sensors. 

CVT-90

 .

❏

 Stop lamp switch signal. 

CVT-83

 .

❏

 Start signal. 

CVT-79

 .

❏

 Accelerator pedal position signal. 

CVT-155

 .

❏

 Vehicle speed signal. 

CVT-157

 .

❏

 Engine speed signal. 

CVT-108

 .

❏

 CAN communication. 

CVT-76

 .

❏

 TCM power supply. 

CVT-150

 .

❏

 Steel belt. 

CVT-110

❏

 Battery

❏

 Other

4-2.

Driving tests

CVT-59

❏

 Cannot Be Changed To Second position. 

CVT-175

 .

❏

 CVT Does Not Shift. 

CVT-59

 .

❏

 perform self-diagnostics. Enter checks for detected items.

❏

 Output speed sensor (secondary speed sensor). 

CVT-101

 .

❏

 Input speed sensor (primary speed sensor). 

CVT-95

 .

❏

 TCC solenoid valve. 

CVT-112

 .

❏

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

CVT-120

 .

❏

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

CVT-131

 .

❏

 Transmission fluid pressure sensor A (secondary pressure sensor).

CVT-135

 .

❏

 Transmission fluid pressure sensor B (primary pressure sensor).

CVT-143

 .

❏

 Lock-up select solenoid valve. 

CVT-163

 .

❏

 Step motor. 

CVT-168

 .

❏

 PNP switch. 

CVT-85

 .

❏

 CVT fluid temperature sensors. 

CVT-90

 .

❏

 Stop lamp switch signal. 

CVT-83

 .

❏

 Start signal. 

CVT-79

 .

❏

 Accelerator pedal position signal. 

CVT-155

 .

❏

 Vehicle speed signal. 

CVT-157

 .

❏

 Engine speed signal. 

CVT-108

 .

❏

 CAN communication. 

CVT-76

 .

❏

 TCM power supply. 

CVT-150

 .

❏

 Steel belt. 

CVT-110

❏

 Battery

❏

 Other

5

❏

 Inspect each system for items found to be NG in the self-diagnostics and repair or replace the malfunctioning 

parts.

6

❏

 perform all road tests and enter the checks again for the required items.

CVT-59

7

❏

 For any remaining NG items, perform the “diagnostics procedure” and repair or replace the malfunctioning 

parts.

8

❏

 Erase the results of the self-diagnostics from the TCM.

CVT-66

, 

CVT-75

CVT-54

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CVT Electrical Parts Location

ACS001T0

SCIA4282E

TROUBLE DIAGNOSIS

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Circuit Diagram

ACS001T1

TCWA0145E

CVT-56

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Inspections Before Trouble Diagnosis

ACS001T2

CVT FLUID CHECK
Fluid Leakage and Fluid Level Check 

●

Inspect for fluid leakage and check the fluid level. Refer to 

CVT-14, "Checking CVT Fluid"

 .

Fluid Condition Check

Inspect the fluid condition.

STALL TEST
Stall Test Procedure

1.

Inspect the amount of engine oil. Replenish the engine oil if necessary.

2.

Drive for about 10 minutes to warm up the vehicle so that the
CVT fluid temperature is 50 - 80

°

C (122 - 176

°

F). Inspect the

amount of CVT fluid. Replenish if necessary.

3.

Securely engage the parking brake so that the tires do not turn.

4.

Engine start, apply foot brake, and place selector lever in “D”
position.

5.

While holding down the foot brake, gradually press down the
accelerator pedal.

6.

Quickly read off the stall speed, and then quickly remove your
foot from the accelerator pedal.

CAUTION:

Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.

7.

Move the selector lever to the “N” position.

8.

Cool down the CVT fluid.

Fluid status

Conceivable Cause

Required Operation

Varnished (viscous 
varnish state)

Clutch, brake 
scorched

Replace the ATF and check the 
CVT main unit and the vehicle for 
malfunctions (wire harnesses, 
cooler pipes, etc.)

Milky white or 
cloudy

Water in the fluid

Replace the ATF and check for 
places where water is getting in.

Large amount of 
metal powder mixed 
in

Unusual wear of 
sliding parts within 
CVT

Replace the ATF and check for 
improper operation of the CVT.

SAT638A

SAT647B

SCIA1224E

SAT514G

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CVT-57

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CAUTION:

Run the engine at idle for at least one minute.

Judgement Stall Test

O: Stall speed within standard value position
H: Stall speed higher than standard value
L: Stall speed lower than standard value

LINE PRESSURE TEST
Line Pressure Test Port

Line Pressure Test Procedure

1.

Inspect the amount of engine oil and replenish if necessary.

2.

Drive the car for about 10 minutes to warm it up so that the CVT fluid reaches in the range of 50 - 80

°

C

(122 - 176

°

F), then inspect the amount of CVT fluid and replenish if necessary.

NOTE:
The automatic fluid temperature rises in the range of 50 - 80

°

C (122 - 176

°

F) during 10 minutes of

driving.

3.

After warming up CVT, remove the oil pressure detection plug and install the oil pressure gauge [special
service tool: ST2505S001 (J34301-C)].

CAUTION:

When using the oil pressure gauge, be sure to use the O- ring attached to the oil pressure detec-
tion plug.

4.

Securely engage the parking brake so that the tires do not turn.

Stall speed

:2,700 - 3,250 rpm

Selector lever position

Expected problem location

D

R

Stall rotation 

H

O

●

Forward clutch

O

H

●

Reverse brake

L

L

●

Engine and torque converter one-way clutch

H

H

●

Line pressure low

●

Primary pulley

●

Secondary pulley

●

Steel belt

SCIA1980E

SCIA1224E

CVT-58

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5.

Start the engine, and then measure the line pressure at both idle
and the stall speed.

CAUTION:

●

Keep the brake pedal pressed all the way down during
measurement.

●

When measuring the line pressure at the stall speed,
refer to 

CVT-56, "STALL TEST"

 . 

6.

After the measurements are complete, install the oil pressure
detection plug and tighten to the regulation torque below.

CAUTION:

 Do not reuse the O-ring.

Line Pressure

*1: Reference values.

Judgement of Line Pressure Test

:5.0 - 10 N-m (0.51 - 1.0 kg-m, 45 - 88 in-lb)

SAT493G

Engine

Engine speed

Line Pressure

kPa (kg/cm

2

 , psi)

R,D,L positions

VQ35DE

At idle speed

 750 (7.65, 108.8)

At stall speed

 5300 - 5700 (54.06 - 58.14, 768.5 - 826.5)*

1

Judgement Possible 

cause

Idle speed

Low for all positions 
(P, R, N, D, L)

Possible causes include malfunctions in the pressure supply system and low oil pump output.
For example

●

Oil pump wear

●

Pressure regulator valve or plug sticking or spring fatigue

●

Oil strainer 

Þ

 oil pump 

Þ

 pressure regulator valve passage oil leak

●

Engine idle speed too low

Only low for a spe-
cific position

Possible causes include an oil pressure leak in a passage or device related to the position after 
the pressure is distributed by the manual valve.

High

Possible causes include a sensor malfunction or malfunction in the line pressure adjustment func-
tion.
For example

●

Accelerator pedal position signal malfunction

●

CVT fluid temperature sensor malfunction

●

Pressure control solenoid A (line pressure solenoid) malfunction (sticking in “OFF” state, filter 
clog, cut line)

●

Pressure regulator valve or plug sticking

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ROAD TEST
Description

●

The purpose of the test is to determine overall performance of CVT and analyze causes of problems.

●

Before road test, familiarize yourself with all test procedures and
items to check.

●

perform tests on all items until specified symptom is found. Trou-
bleshoot items which check out No Good after road test. Refer
to 

CVT-45, "ON BOARD DIAGNOSTIC (OBD) SYSTEM"

 .

Cruse Test

With CONSULT-II

●

Using CONSULT-II, perform a cruise test and record the result.

●

Print the result and ensure that shifts and lock-ups take place as
per Shift Schedule.

CONSULT-II Setting Procedure

CAUTION:

If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carry out CAN communication.

1.

Turn ignition switch “OFF”.

Stall speed

Oil pressure does 
not rise higher than 
the oil pressure for 
idle.

Possible causes include a sensor malfunction or malfunction in the pressure adjustment function.
For example

●

Accelerator pedal position signal malfunction

●

TCM breakdown

●

Pressure control solenoid A (line pressure solenoid) malfunction (shorting, sticking in“ ON” 
state)

●

Pressure regulator valve or plug sticking

The pressure rises, 
but does not enter 
the standard posi-
tion.

Possible causes include malfunctions in the pressure supply system and malfunction in the pres-
sure adjustment function.
For example

●

Accelerator pedal position signal malfunction

●

Pressure control solenoid A (line pressure solenoid) malfunction (sticking, filter clog)

●

Pressure regulator valve or plug sticking

Only low for a spe-
cific position

Possible causes include an oil pressure leak in a passage or device related to the position after 
the pressure is distributed by the manual valve.

Judgement Possible 

cause

SAT496G

SAT601J

CVT-60

TROUBLE DIAGNOSIS

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2.

Connect CONSULT-II and CONSULT-II CONVERSTER to data
link connector, which is located in lower instrument panel on
driver side.

3.

Turn ignition switch “ON”.

4.

Touch “START (NISSAN BASED VHCL)”.

5.

Touch “TRANSMISSION”.
If “TRANSMISSION” or “ENGINE” is not indicated, go to 

GI-38,

"CONSULT-II Data Link Connector (DLC) Circuit"

 .

6.

Touch “DATA MONITOR”.

PBIB0196E

SAIA0450E

SCIA2272E

SCIA5492E

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7.

Touch “MAIN SIGNALS” to set recording condition.

8.

See “Numerical Display”, “Barchart Display” or “Line Graph Dis-
play”.

9.

Touch “START”.

10. When performing cruise test, touch “Store Data”.

11. After finishing cruise test part 1, touch “STOP”.

12. Touch “STORE”.

SCIA5493E

SAT236K

SAT237K

SAT254K

CVT-62

TROUBLE DIAGNOSIS

Revision; 2004 April

2003 Murano

13. Touch “DISPLAY”.

14. Touch “PRINT”.

15. Check the monitor data printed out.

Vehicle Speed When Shifting Gears

ACS001T8

Numerical value data are reference values.

CAUTION:

Lock-up clutch is engaged when vehicle speed is approximately 18 km/h (11MPH) to 40 km/h (25MPH).

SAT608J

SAT974J

SAT238K

Engine type

 Throttle position

Shift pattern

Engine speed (rpm)

At 40 km/h (25MPH)

At 60 km/h (37MPH)

VQ35DE

8/8

D position

Second position

L position

 2,800 - 4,300

 3,900 - 5,300

2/8

D position

 1,200 - 2,000

 1,300 - 2,100

Second position

 2,200 - 3,000

 2,800 - 3,600

L position

 2,800 - 3,600

 3,800 - 4,600

TROUBLE DIAGNOSIS

CVT-63

D

E

F

G

H

I

J

K

L

M

A

B

CVT

Revision; 2004 April

2003 Murano

TCM Input/Output Signal Reference Values

ACS001TC

TCM TERMINAL CONNECTOR LAYOUT 

TCM INSPECTION TABLE

Data are reference values and are measured between each terminal and ground.

SCIA0495E

Terminal 

No.

Wire 

color

Item

Condition

Data (Approx.)

1

R/Y

Pressure control 
solenoid valve A 
(line pressure 
solenoid valve)

 Release your foot from the accelerator pedal.

5.0 - 7.0V

 Press the accelerator pedal all the way down.

1.0V

2

W/B

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

 Release your foot from the accelerator pedal.

5.0 - 7.0V

 Press the accelerator pedal all the way down.

3.0 - 4.0V

3

L/W

TCC solenoid 
valve

When 

vehicle 
cruises

Lock-up applied to lock-up cancelled

6.0 - 1.0V

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

5

L

CAN H

–

–

6

Y

CAN L

–

–

8

SB

Back-up lamp 
relay

Selector lever in “R” position.

Battery voltage

Selector lever in other positions.

0V

10

Y/L

Power supply

—

Battery voltage

—

0V

11

G/R

Step motor A

Within 2 seconds after key switch “ON”, the time measurement by 
using the pulse width measurement function (Hi level) of CONSULT-
II.*1

CAUTION:

Connect the diagnosis data link cable to the vehicle diagnosis 
connector.
*1: A circuit tester cannot be used to test this item.

30.0 msec

12

O/B

Step motor B

10.0 msec 

13

G/W

 ROM assembly

—

—

—

—

14

L/R

 ROM assembly

—

—

—

—

CVT-64

TROUBLE DIAGNOSIS

Revision; 2004 April

2003 Murano

15

BR/R

 ROM assembly

—

—

—

—

19

Y/L

Power supply

—

Battery voltage

—

0V

20

R

Step motor C

Within 2 seconds after key switch “ON”, the time measurement by 
using the pulse width measurement function (Hi level) of CONSULT-
II.*1

CAUTION:

Connect the diagnosis data link cable to the vehicle diagnosis 
connector.
*1: A circuit tester cannot be used to test this item.

30.0 msec

21

R/G

Step motor D

10.0 msec 

24

G/O

Starter relay

Selector lever in “N”,“P”position.

Battery voltage

Selector lever in other position.

0V

 

—

0V

25

B

Ground

—

0V

27

BR/W

PNP switch 1

Selector lever in “R”,“N”,“D”position.

0V

Selector lever in other position.

Battery voltage

28

Y/R

Power supply
(Memory back-up)

—

Battery voltage

29

LG/R

Output speed sen-
sor (secondary 
speed sensor)

When 

vehicle 
cruises

When driving [D position, 20 km/h (12 MPH)]

300 (Hz)

32

GR

PNP switch 3 
(monitor)

Selector lever in “D”,“L” position.

0V

Selector lever in other positions.

Battery voltage

34

P/B

PNP switch 2

Selector lever in “N”,“D”,“L”position.

0V

Selector lever in other positions.

Battery voltage

35

P/L

PNP switch 3

Selector lever in “D”,“L” position.

0V

Selector lever in other positions.

Battery voltage

36

G

PNP switch 4

Selector lever in “R”, “D”position.

0V

Selector lever in other positions.

Battery voltage

37

V/W

Transmission fluid 
pressure sensor A 
(secondary pres-
sure sensor)

 N position idle

0.8V

38

LG

Input speed sen-
sor (primary 
speed sensor)

When 

vehicle 
cruises

When driving [L position, 20 km/h (12 MPH)]

600 (Hz)

Terminal 

No.

Wire 

color

Item

Condition

Data (Approx.)