Nissan Murano Z51 (2008 year). Manual - part 375

The TCM receives a signal from the vehicle speed sensor and PNP switch. Then it 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 a malfunction that occurs inter-
mittently rather than continuously. Most intermittent malfunctions are
caused by poor electric connections or improper wiring. In this case,
careful checking of suspected circuits may help prevent the replace-
ment of good parts.
A visual check only may not find the cause of the malfunctions. A
road test with CONSULT-III (or GST) or a circuit tester connected
should be performed. Follow the “DETAILED FLOW”.

Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such malfunctions, espe-
cially intermittent ones. Find out what symptoms are present and
under what conditions they occur. A “Diagnostic Work Sheet” as
shown on the example (Refer to

TM-6

) should be used.

Start your diagnosis by looking for “conventional” malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.
Also check related Service Bulletins.

DETAILED FLOW

COLLECT THE INFORMATION FROM THE CUSTOMER

Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred) using the diagnosis work sheet. Refer to

TM-6, "Diagnostic Work Sheet"

>> GO TO 2.

CHECK SYMPTOM 1

Check the following items based on the information obtained from the customer.
• Fail-safe. Refer to

TM-128, "Fail-safe"

• CVT fluid inspection. Refer to

TM-149, "Inspection"

• Line pressure test. Refer to

TM-156, "Inspection and Judgment"

SAT631IB

SAT632I

SEF234G

Revision: 2008 October

2009 Murano

TM-6

< BASIC INSPECTION >

[CVT: RE0F09B]

DIAGNOSIS AND REPAIR WORK FLOW

• Stall test. Refer to

TM-154, "Inspection and Judgment"

>> GO TO 3.

CHECK DTC

Check DTC.

Perform the following procedure if DTC is detected.

• Record DTC.
• Erase DTC. Refer to

TM-32, "Diagnosis Description"

Is any DTC detected?

YES

>> GO TO 4.

>> GO TO 5.

PERFORM DIAGNOSTIC PROCEDURE

Perform “Diagnostic Procedure” for the displayed DTC. Repair detected items.

>> GO TO 5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform “DTC CONFIRMATION PROCEDURE” for the displayed DTC.
Is DTC detected?

YES

>> GO TO 4.

>> GO TO 6.

CHECK SYMPTOM 2

Confirm the symptom described by the customer.

Is any malfunction present?

YES

>> GO TO 7.

>> INSPECTION END

ROAD TEST

Perform “ROAD TEST”. Refer to

TM-158, "Description"

>> GO TO 8.

CHECK SYMPTOM 3

Confirm the symptom described by the customer.

Is any malfunction present?

YES

>> GO TO 2.

>> INSPECTION END

Diagnostic Work Sheet

INFOID:0000000003305976

INFORMATION FROM CUSTOMER

KEY POINTS

• WHAT..... Vehicle & CVT model
• WHEN..... Date, Frequencies
• WHERE..... Road conditions
• HOW..... Operating conditions, Symptoms

Customer name

MR/MS

Model & Year

VIN

Trans. Model

Engine

Mileage

Malfunction Date

Manuf. Date

In Service Date

Frequency

Continuous

Intermittent (

times a day)

Revision: 2008 October

2009 Murano

DIAGNOSIS AND REPAIR WORK FLOW

TM-7

< BASIC INSPECTION >

[CVT: RE0F09B]

DIAGNOSTIC WORK SHEET

Symptoms

Vehicle does not move.

(

Any position

Particular position)

No shift

Lock-up malfunction

Shift shock or slip

(

→

Lock-up

Any drive position)

Noise or vibration

No pattern select

Others

(

)

Malfunction Indicator Lamp (MIL)

Continuously lit

Not lit

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

TM-128

CVT fluid inspection, stall test and line pressure test

CVT fluid inspection

TM-149

Leak (Repair leak location.)

State

Amount

Stall test

TM-154
TM-156

Torque converter one-way clutch

Reverse brake

Forward clutch

Steel belt

Engine

Line pressure low

Primary pulley

Secondary pulley

Line pressure inspection - Suspected part:

Perform self-diagnosis.

TM-34

Enter checks for detected items.

Perform road test.

TM-158

4-1.

Check before engine is started

TM-158

4-2.

Check at idle

TM-159

4-3.

Cruise test

TM-160

Check malfunction phenomena to repair or replace malfunctioning part after completing all road tests.

TM-131

Drive vehicle to check that the malfunction phenomenon has been resolved.

Erase the results of the self-diagnosis from the TCM and the ECM.

Revision: 2008 October

2009 Murano

TM-8

< BASIC INSPECTION >

[CVT: RE0F09B]

INSPECTION AND ADJUSTMENT

INSPECTION AND ADJUSTMENT

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT

ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Precaution for TCM
and CVT Assembly Replacement

INFOID:0000000003674388

CAUTION:

• Check if new data (Unit ID) are entered correctly after replacing CVT assembly and erasing data in

TCM. (Connect CONSULT-III, and then turn ignition switch OFF.)

• When replacing CVT assembly or TCM, refer to the pattern table below and erase the EEPROM in the

TCM if necessary.

EEPROM ERASING PATTERNS

METHOD FOR ERASING THE EEPROM IN THE TCM

Turn ignition switch ON.

Move selector lever to “R” position.

Perform “Self Diagnostic Results” in “TRANSMISSION”.

Press the brake pedal and turn the brake switch ON.

Press the accelerator pedal (0.5/8 - 4/8 throttle) not to exceed the half, and hold it in the half or less open
position. (This will set the closed throttle position signal to OFF and the wide open throttle position signal
to OFF.)

Perform “ERASE”.

Wait 3 seconds and then release the accelerator pedal.

Turn ignition switch OFF.

METHOD FOR WRITING DATA FROM THE ROM ASSEMBLY IN THE TRANSAXLE

In the following procedure, the TCM reads data from the ROM assembly and writes it to the EEPROM in the
TCM.

Erase the EEPROM in the TCM.

Move selector lever to “P” position.

Turn ignition switch ON.

CHECK METHOD

• Standard: About 2 seconds after the ignition switch ON, the CVT indicator lamp lights up for 2 seconds.
• Non-standard: Even after the ignition switch ON, the CVT indicator lamp does not light up after 2 seconds or

illuminates immediately.

CAUTION:

Perform in the “P” or “N” position.

Action for Non-standard

• Replace the CVT assembly.
• Replace the TCM.

CVT assembly

TCM

Erasing EEPROM in TCM

Remarks

Replaced

Not required

Not required because the EEPROM in the TCM is in
the default state. (CVT assembly must be replaced
first.)

Not replaced

Replaced

Not required

Not required because the EEPROM in the TCM is in
the default state.

Replaced

Not replaced

Required

Required because data has been written in the EE-
PROM in the TCM and because the TCM cannot write
data from the ROM assembly in the transmission.

Revision: 2008 October

2009 Murano

CVT SYSTEM

TM-9

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

FUNCTION DIAGNOSIS

CVT SYSTEM

System Diagram

INFOID:0000000003305978

JPDIA0595GB

Revision: 2008 October

2009 Murano

TM-10

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

CVT SYSTEM

Component Parts Location

INFOID:0000000003305979

JPDIA0621GB

Revision: 2008 October

2009 Murano

MECHANICAL SYSTEM

TM-11

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

MECHANICAL SYSTEM

Cross-Sectional View

INFOID:0000000003305980

Converter housing

Oil pump

Forward clutch

Reverse brake

Planetary carrier

Primary pulley

Steel belt

Sun gear

Side cover

10. Internal gear

11.

Secondary pulley

12. Final gear

13. Differential case

14. Idler gear

15. Reduction gear

16. Taper roller bearing

17. Output gear

18. Parking gear

19. Input shaft

20. Torque converter

SCIA4837E

Revision: 2008 October

2009 Murano

TM-12

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

MECHANICAL SYSTEM

System Diagram

INFOID:0000000003317230

System Description

INFOID:0000000003305982

Transmits the power from the engine to the drive wheel.

JPDIA0595GB

Revision: 2008 October

2009 Murano

MECHANICAL SYSTEM

TM-13

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

Component Parts Location

INFOID:0000000003317231

Component Description

INFOID:0000000003305984

JPDIA0621GB

Revision: 2008 October

2009 Murano

TM-14

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

MECHANICAL SYSTEM

Item

Function

Torque converter

The torque converter is the device that increases the engine torque as well as the con-
ventional AT and transmits it to the transaxle.

Oil pump

The adoption of a trochoidal oil pump with a flow control valve actuated directly by the
engine enables the sufficient discharge from an oil pump in the low-rpm range and the
adequate discharge adjustments in the high-rpm range.

Planetary gear

Perform the transmission of drive power and the switching of forward/backward move-
ment.

Forward clutch

Reverse brake

Primary pulley

It is composed of a pair of pulleys (the groove width is changed freely in the axial direc-
tion) and the steel belt (the steel star wheels are placed continuously and the belt is guid-
ed with the multilayer steel rings on both sides). The groove width changes according to
wrapping radius of steel belt and pulley from low status to overdrive status continuously
with non-step. It is controlled with the oil pressures of primary pulley and secondary pul-
ley.

Secondary pulley

Steel belt

Output gear

Reduction gear consists of primary deceleration (output gear and idler gear in pair) and
secondary deceleration (reduction gear and final gear in pair). Each of them uses a he-
lical gear.

Idler gear

Reduction gear

Final gear

Differential

Manual shaft

The parking rod rotates the parking pole and the parking pole engages with the parking
gear when the manual shaft is in “P” position. As a result the parking gear and the output
axis are fixed.

Parking rod

Parking pawl

Parking gear

Revision: 2008 October

2009 Murano

HYDRAULIC CONTROL SYSTEM

TM-15

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

HYDRAULIC CONTROL SYSTEM

System Diagram

INFOID:0000000003305985

System Description

INFOID:0000000003305986

The hydraulic control mechanism consists of the oil pump directly driven by the engine, the hydraulic control
valve that controls line pressure and transmission, and the input signal line.

LINE PRESSURE AND SECONDARY PRESSURE CONTROL

• When an input torque signal equivalent to the engine driving force is transmitted from the ECM to the TCM,

the TCM controls the line pressure solenoid valve and secondary pressure solenoid valve.

• Line pressure solenoid valve activates pressure regulator valve, and line pressure from oil pump is adjusted

for the optimum driving condition. Secondary pressure is controlled by lowering line pressure.

JPDIA0589GB

SCIA1846E

Revision: 2008 October

2009 Murano

TM-16

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

HYDRAULIC CONTROL SYSTEM

Normal Control

Optimize the line pressure and secondary pressure, depending on driving conditions, on the basis of the throt-
tle position, the engine speed, the primary pulley (input) revolution speed, the secondary pulley (output) revo-
lution speed, the brake signal, the PNP switch signal, the lock-up signal, the voltage, the target gear ratio, the
fluid temperature, and the fluid pressure.

Feedback Control

For the normal fluid control and the select fluid control, secondary pressure is detected for feedback control by
using a secondary pressure sensor to set a high-precision secondary pressure.

Revision: 2008 October

2009 Murano

HYDRAULIC CONTROL SYSTEM

TM-17

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

Component Parts Location

INFOID:0000000003317233

Component Description

INFOID:0000000003305988

TRANSAXLE ASSEMBLY

JPDIA0621GB

Revision: 2008 October

2009 Murano

TM-18

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

HYDRAULIC CONTROL SYSTEM

EXCEPT TRANSAXLE ASSEMBLY

Name

Function

Torque converter regulator valve

Optimizes the supply pressure for the torque converter depending on driving conditions.

Pressure regulator valve

Optimizes the discharge pressure from the oil pump depending on driving conditions.

TCC control valve

• Activates or deactivates the lock-up.
• Locks up smoothly by opening lock-up operation excessively.

Shift control valve

Controls inflow/outflow of line pressure from the primary pulley depending on the stroke
difference between the stepping motor and the primary pulley.

Secondary valve

Controls the line pressure from the secondary pulley depending on operating conditions.

Clutch regulator valve

Adjusts the clutch operating pressure depending on operating conditions.

Manual valve

Transmits the clutch operating pressure to each circuit in accordance with the selected
position.

Select control valve

Engages forward clutch, reverse brake smoothly depending on select operation.

Select switch valve

The select switch valve enables to select engagement/disengagement of lock-up clutch
and that of forward clutch and reverse clutch.

TCC solenoid valve

TM-60, "Description"