Nissan Murano Z51 (2008 year). Manual

CONTROL SYSTEM

TM-19

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

CONTROL SYSTEM

System Diagram

INFOID:0000000003305989

System Description

INFOID:0000000003305990

The CVT senses vehicle operating conditions through various sensors. It always controls the optimum shift
position and reduces shifting and lock-up shocks.

TCM FUNCTION

The function of the TCM is to:
• Receive input signals sent from various switches and sensors.
• Determine required line pressure, shifting point, and lock-up operation.
• Send required output signals to the step motor and the respective solenoids.

INPUT/OUTPUT SIGNAL OF TCM

JPDIA0622GB

SENSORS (or SIGNAL)

⇒

TCM

⇒

ACTUATORS

PNP switch
Accelerator pedal position signal
Closed throttle position signal
Engine speed signal
CVT fluid temperature sensor
Vehicle speed signal
Overdrive control switch signal
Stop lamp switch signal
Primary speed sensor
Secondary speed sensor
Primary pressure sensor
Secondary pressure sensor

Shift control
Line pressure control
Primary pressure control
Secondary pressure control
Lock-up control
Engine brake control
Vehicle speed control
Fail-safe control
Self-diagnosis
CONSULT-III communication line
Duet-EA control
CAN system
On board diagnosis

Step motor
Torque converter clutch solenoid
valve
Lock-up select solenoid valve
Line pressure solenoid valve
Secondary pressure solenoid valve
OD OFF indicator lamp
Shift position indicator
Starter relay

Revision: 2008 October

2009 Murano

TM-20

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

CONTROL SYSTEM

• *1: Input by CAN communications.

• *2: Output by CAN communications.

• *3: If these input and output signals are different, the TCM triggers the fail-safe function.

Control item

Fluid

pressure

control

Select con-

trol

Shift con-

trol

Lock-up

control

CAN com-

munica-

tion control

Fail-safe

function

Input

PNP switch

Accelerator pedal position signal

Closed throttle position signal

Engine speed signal

CVT fluid temperature sensor

Overdrive control switch signal

Stop lamp switch signal

Primary speed sensor

Secondary speed sensor

Primary pressure sensor

Secondary pressure sensor

TCM power supply voltage signal

Output

Step motor

TCC solenoid valve

Lock-up select solenoid valve

Line pressure solenoid valve

Secondary pressure solenoid valve

OD OFF indicator signal

Revision: 2008 October

2009 Murano

CONTROL SYSTEM

TM-21

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

Component Parts Location

INFOID:0000000003317268

Component Description

INFOID:0000000003305992

TRANSAXLE ASSEMBLY

JPDIA0621GB

Revision: 2008 October

2009 Murano

TM-22

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

CONTROL SYSTEM

EXCEPT TRANSAXLE ASSEMBLY

Name

Function

PNP switch

TM-44, "Description"

CVT fluid temperature sensor

TM-47, "Description"

Primary speed sensor

TM-50, "Description"

Secondary speed sensor

TM-53, "Description"

Primary pressure sensor

TM-78, "Description"

Secondary pressure sensor

TM-72, "Description"

Step motor

TM-95, "Description"

TCC solenoid valve

TM-60, "Description"

Lock-up select solenoid valve

TM-92, "Description"

Line pressure solenoid valve

TM-64, "Description"

Secondary pressure solenoid valve

TM-70, "Description"

Name

Function

TCM

TM-17, "Component Description"

Stop lamp switch

TM-41, "Description"

Revision: 2008 October

2009 Murano

LOCK-UP AND SELECT CONTROL SYSTEM

TM-23

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

LOCK-UP AND SELECT CONTROL SYSTEM

System Diagram

INFOID:0000000003305993

System Description

INFOID:0000000003305994

• The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to

increase power transmission efficiency.

• The torque converter clutch control valve operation is controlled by the torque converter clutch solenoid

valve, which is controlled by a signal from TCM. The torque converter clutch control valve engages or
releases the torque converter clutch piston.

• When shifting between “N” (“P”)

⇒

“D” (“R”), torque converter clutch solenoid valve controls engagement

power of forward clutch and reverse brake.

• The lock-up applied gear range was expanded by locking up the

torque converter at a lower vehicle speed than conventional CVT
models.

TORQUE CONVERTER CLUTCH AND SELECT CONTROL VALVE CONTROL

Lock-up Released

In the lock-up released state, the torque converter clutch control valve is set into the unlocked state by the
torque converter clutch solenoid valve and the lock-up apply pressure is drained.
In this way, the torque converter clutch piston is not coupled.

Lock-up Applied

In the lock-up applied state, the torque converter clutch control valve is set into the locked state by the torque
converter clutch solenoid valve and lock-up apply pressure is generated.
In this way, the torque converter clutch piston is pressed and coupled.

Select Control

When shifting between “N” (“P”)

⇒

“D” (“R”), optimize the operating pressure on the basis of the throttle posi-

tion, the engine speed, and the secondary pulley (output) revolution speed to lessen the shift shock.

SCIA2374E

JPDIA0312GB

Revision: 2008 October

2009 Murano

LOCK-UP AND SELECT CONTROL SYSTEM

TM-25

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

EXCEPT TRANSAXLE ASSEMBLY

Name

Function

Torque converter regulator valve

TM-17, "Component Description"

TCC control valve

Select control valve

Select switch valve

Manual valve

TCC solenoid valve

TM-60, "Description"

Lock-up select solenoid valve

TM-92, "Description"

Primary speed sensor

TM-50, "Description"

Secondary speed sensor

TM-53, "Description"

CVT fluid temperature sensor

TM-47, "Description"

PNP switch

TM-44, "Description"

Forward clutch

TM-13, "Component Description"

Reverse brake

Torque converter

Name

Function

TCM

TM-17, "Component Description"

Accelerator pedal position sensor

TM-86, "Description"

Revision: 2008 October

2009 Murano

TM-26

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

SHIFT CONTROL SYSTEM

SHIFT CONTROL SYSTEM

System Diagram

INFOID:0000000003305997

NOTE:
The gear ratio is set for each position separately.

System Description

INFOID:0000000003305998

In order to select the gear ratio that can obtain the driving force in accordance with driver's intention and the
vehicle condition, TCM monitors the driving conditions, such as the vehicle speed and the throttle position,
selects the optimum gear ratio, and determines the gear change steps to the gear ratio. Then TCM sends the
command to the step motor, controls the inflow/outflow of line pressure from the primary pulley to determine
the position of the moving-pulley and controls the gear ratio.

“D” POSITION

Shifting over all the ranges of gear ratios from the lowest to the high-
est.

OVERDRIVE OFF CONDITION

Use this position for improved engine braking.

“L” POSITION

JPDIA0623GB

SCIA1953E

JPDIA0685GB

Revision: 2008 October

2009 Murano

SHIFT CONTROL SYSTEM

TM-27

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

By limiting the gear range to the lowest position, the strong driving
force and the engine brake can be secured.

DOWNHILL ENGINE BRAKE CONTROL (AUTO ENGINE BRAKE CONTROL)

When a downhill slope is detected with the accelerator pedal released, the engine brake will be strengthened
up by downshifting so as not to accelerate the vehicle more than necessary.

ACCELERATION CONTROL

According to vehicle speed and a change of accelerator pedal angle, driver's request for acceleration and driv-
ing scene are judged. This function assists improvement in the acceleration feeling by making the engine
speed proportionate to the vehicle speed. And a shift map that can gain a larger driving force is available for
compatibility of mileage with driveability.

JPDIA0686GB

Revision: 2008 October

2009 Murano

SHIFT CONTROL SYSTEM

TM-29

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

EXCEPT TRANSAXLE ASSEMBLY

Item

Function

PNP switch

TM-44, "Description"

Primary speed sensor

TM-50, "Description"

Secondary speed sensor

TM-53, "Description"

Step motor

TM-95, "Description"

Shift control valve

TM-17, "Component Description"

Primary pulley

TM-13, "Component Description"

Secondary pulley

TM-13, "Component Description"

Item

Function

TCM

TM-17, "Component Description"

Revision: 2008 October

2009 Murano

TM-30

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

SHIFT LOCK SYSTEM

SHIFT LOCK SYSTEM

System Description

INFOID:0000000003306001

The shift lever cannot be shifted from the “P” position unless the
brake pedal is depressed while the ignition switch is set to ON. The
shift lock is unlocked by turning the shift lock solenoid ON when the
ignition switch is set to ON, the park position switch is turned ON
(selector lever is in “P” position), and the stop lamp switch is turned
ON (brake pedal is depressed) as shown in the operation chart in the
figure. Therefore, the shift lock solenoid receives no ON signal and
the shift lock remains locked if all of the above conditions are not ful-
filled. (However, selector operation is allowed if the shift lock release
button is pressed.)

SHIFT LOCK OPERATION AT “P” POSITION

When Brake Pedal Is Not Depressed (No Selector Operation Allowed)

The shift lock solenoid (A) is turned OFF (not energized) and the
solenoid rod (B) is extended with the spring when the brake pedal is
not depressed (no selector operation allowed) with the ignition
switch ON.
The connecting lock lever (C) is located at the position shown in the
figure when the solenoid rod is extended. It prevents the movement
of the detent rod (D). For these reasons, the selector lever cannot be
shifted from the “P” position.

When Brake Pedal Is Depressed (Shift Operation Allowed)

The shift lock solenoid (A) is turned ON (energized) when the brake
pedal is depressed with the ignition switch ON. The solenoid rod (B)
is compressed by the electromagnetic force. The connecting lock
lever (C) rotates when the solenoid is activated. Therefore, the
detent rod (D) can be moved. For these reasons, the selector lever
can be shifted to other positions.

“P” POSITION HOLD MECHANISM (IGNITION SWITCH LOCK)

JPDIA0624GB

JPDIA0612ZZ

JPDIA0613ZZ

Revision: 2008 October

2009 Murano

SHIFT LOCK SYSTEM

TM-31

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

The shift lock solenoid (A) is not energized when the ignition switch
is in any position other than ON. In this condition, the shift mecha-
nism is locked and “P” position is held. The operation cannot be per-
formed from “P” position if the brake pedal is depressed with the
ignition switch ON when the operation system of shift lock solenoid is
malfunctioning. However, the lock lever (B) is forcibly rotated and the
shift lock is released when the shift lock release button (C) is
pressed from above. Then the selector operation from “P” position
can be performed.

CAUTION:

Use the shift lock release button only when the selector lever cannot be operated even if the brake
pedal is depressed with the ignition switch ON.

Component Parts Location

INFOID:0000000003306002

Component Description

INFOID:0000000003306003

SHIFT LOCK

: Detent rod

JPDIA0614ZZ

Shift lock relay

Stop lamp switch

Brake pedal

Shift lock solenoid

Park position switch

Shift lock release button

JPDIA0625ZZ

Component

Function

Shift lock solenoid

TM-101

Lock lever

Detent rod

Park position switch

Shift lock release button

Revision: 2008 October

2009 Murano

TM-32

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Diagnosis Description

INFOID:0000000003306004

DESCRIPTION

The CVT system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination
with the ECM. A malfunction is indicated by the MIL (Malfunction Indicator Lamp) and is stored as a DTC in
the ECM memory and in the TCM memory.
The second is the TCM original self-diagnosis performed by the TCM. A malfunction history is stored in the
TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For details, refer to

TM-

129, "DTC Index"

OBD-II FUNCTION

The ECM provides emission-related on board diagnostic (OBD-II) functions for the CVT system. One function
is to receive a signal from the TCM used with OBD-related parts of the CVT system. The signal is sent to the
ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a
diagnostic result by means of the MIL (Malfunction Indicator Lamp) on the instrument panel. Sensors,
switches and solenoid valves are used as sensing elements.
The MIL automatically illuminates in “One or Two Trip Detection Logic” when a malfunction is sensed in rela-
tion to CVT system parts.

ONE OR TWO TRIP DETECTION LOGIC OF OBD-II

One Trip Detection Logic

If a malfunction is sensed during the first test drive, the MIL illuminates and the ECM memory stores the mal-
function as a DTC. The TCM is not provided with such a memory function.

Two Trip Detection Logic

When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC
(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL does not illuminate. — 1st trip
If the same malfunction as that experienced during the first test drive is sensed during the second test drive,
the MIL will illuminate. — 2nd trip
The “trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation.

OBD-II DIAGNOSTIC TROUBLE CODE (DTC)

How to Read DTC and 1st Trip DTC

DTC and 1st trip DTC can be read by the following methods.
(

with CONSULT-III or

GST) CONSULT-III or GST (Generic Scan Tool) Examples: P0705, P0720, etc.

These DTC are prescribed by SAE J2012.
(CONSULT-III also displays the malfunctioning component or system.)
• 1st trip DTC No. is the same as DTC No.
• Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-

ever, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring or
it occurred in the past and has returned to normal.
CONSULT-III can identify them as shown below, therefore, CONSULT-III (if available) is recom-
mended.

- DTC or 1st trip DTC of a malfunction is displayed in Self-Diagnostic Results in “ENGINE” with CONSULT-III.

Time data indicates how many times the vehicle was driven after the last detection of a DTC.

- If the DTC is being detected currently, the time data will be “0”.
- If a 1st trip DTC is stored in the ECM, the time data will be “1t”.

Freeze Frame Data and 1st Trip Freeze Frame Data

• The ECM has a memory function, which stores the driving conditions such as fuel system status, calculated

load value, engine coolant temperature, short-term fuel trim, long-term fuel trim, engine speed and vehicle
speed at the moment the ECM detects a malfunction.
Data that are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data,
and the data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-
III or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-III screen, not on the GST.
For details, refer to

EC-115, "CONSULT-III Function"

Revision: 2008 October

2009 Murano

ON BOARD DIAGNOSTIC (OBD) SYSTEM

TM-33

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data, and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.

Both 1st trip freeze frame data and freeze frame data (along with the DTC) are cleared when the ECM mem-
ory is erased.

How to Erase DTC

• The diagnostic trouble code can be erased by CONSULT-III, GST or ECM DIAGNOSTIC TEST MODE as

described below.

- If the battery cable is disconnected, the diagnostic trouble code will be lost within 24 hours.
- When erasing the DTC, using CONSULT-III or GST is easier and quicker than switching the mode

selector on the ECM.

• The following emission-related diagnostic information is cleared from the ECM memory when erasing DTC

related to OBD-II. For details, refer to

EC-521, "DTC Index"

- Diagnostic trouble codes (DTC)
- 1st trip diagnostic trouble codes (1st trip DTC)
- Freeze frame data
- 1st trip freeze frame data
- System readiness test (SRT) codes
- Test values

How to Erase DTC (With CONSULT-III)

The emission related diagnostic information in the TCM and ECM can be erased by selecting “ALL Erase” in
the “Description” of “FINAL CHECK” mode with CONSULT-III.

How to Erase DTC (With GST)

If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10
seconds and then turn it ON (engine stopped) again.

Select Mode 4 with GST (Generic Scan Tool). For details, refer to

EC-115, "CONSULT-III Function"

MALFUNCTION INDICATOR LAMP (MIL)

Description

The MIL is located on the instrument panel.

The MIL is turned ON when the ignition switch is turned ON
without the engine running. This is a bulb check.
• If the MIL is not turned ON, refer to

EC-456, "Component

Function Check"

Turn OFF the MIL when the engine is started.
If the MIL remains ON, the on board diagnostic system has
detected an engine system malfunction.

Priority

Items

Freeze frame data

Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175

Except the above items (Includes CVT related items)

1st trip freeze frame data

SEF217U

Revision: 2008 October

2009 Murano

TM-34

< FUNCTION DIAGNOSIS >

[CVT: RE0F09B]

DIAGNOSIS SYSTEM (TCM)

DIAGNOSIS SYSTEM (TCM)

CONSULT-III Function (TRANSMISSION)

INFOID:0000000003306005

FUNCTION

CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.

WORK SUPPORT MODE

Display Item List

Engine Brake Adjustment

CAUTION:

Mode of “+1”“0”“

−

1”“

−

2”“OFF” can be selected by touching “UP”or “DOWN” on CONSULT-III screen.

However, do not select a mode other than “0” and “OFF”. Selecting “+1” or “

−

1” or “–2” may cause

irregular driveability.

Check CVT Fluid Deterioration Date

CAUTION:

Touch “CLEAR” after changing CVT fluid, and then erase “CVTF DETERIORATION DATE”.

SELF DIAGNOSTIC RESULTS MODE

Refer to

TM-129, "DTC Index"

DATA MONITOR MODE

Display Items List

Diagnostic test mode

Function

Work Support

This mode enables a technician to adjust some devices faster and more accurately.

Self Diagnostic Results

Retrieve DTC from ECU and display diagnostic items.

Data Monitor

Monitor the input/output signal of the control unit in real time.

CAN Diagnosis

This mode displays a network diagnosis result about CAN by a diagram.

CAN Diagnostic Support Monitor

It monitors the status of CAN communication.

Function Test

This mode can show results of self-diagnosis of ECU with either “OK” or “NG”. For en-
gine, more practical tests regarding sensors/switches and/or actuators are available.

ECU Identification

Display the ECU identification number (part number etc.) of the selected system.

Special Function

Other results or histories, etc. that are recorded in ECU are displayed.

Item name

Description

ENGINE BRAKE ADJ.

The engine brake level setting can be canceled.

CONFORM CVTF DETERIORTN

The CVT fluid deterioration level can be checked.

“ENGINE BRAKE LEVEL”

: Initial set value (Engine brake level control is activated)

OFF

: Engine brake level control is deactivated.

“CVTF DETERIORATION DATE”

More than 210000

: It is necessary to change CVT fluid.

Less than 210000

: It is not necessary to change CVT fluid.

Revision: 2008 October

2009 Murano

Nissan Murano Z51 (2008 year). Manual - part 376