Nissan Murano Z51 (2008 year). Manual — part 376
CONTROL SYSTEM
TM-19
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
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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
*3
Input
PNP switch
X
X
X
X
X
X
Accelerator pedal position signal
*1
X
X
X
X
X
X
Closed throttle position signal
*1
X
X
X
X
Engine speed signal
*1
X
X
X
X
X
CVT fluid temperature sensor
X
X
X
X
X
Overdrive control switch signal
*1
X
X
X
X
Stop lamp switch signal
*1
X
X
X
X
Primary speed sensor
X
X
X
X
X
Secondary speed sensor
X
X
X
X
X
X
Primary pressure sensor
X
X
Secondary pressure sensor
X
X
X
TCM power supply voltage signal
X
X
X
X
X
X
Output
Step motor
X
X
TCC solenoid valve
X
X
X
Lock-up select solenoid valve
X
X
X
Line pressure solenoid valve
X
X
X
X
Secondary pressure solenoid valve
X
X
X
OD OFF indicator signal
*2
X
X
Revision: 2008 October
2009 Murano
CONTROL SYSTEM
TM-21
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
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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
CVT fluid temperature sensor
Primary speed sensor
Secondary speed sensor
Primary pressure sensor
Secondary pressure sensor
Step motor
TCC solenoid valve
Lock-up select solenoid valve
Line pressure solenoid valve
Secondary pressure solenoid valve
Name
Function
TCM
TM-17, "Component Description"
Stop lamp switch
Revision: 2008 October
2009 Murano
LOCK-UP AND SELECT CONTROL SYSTEM
TM-23
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
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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
TM-24
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
LOCK-UP AND SELECT CONTROL SYSTEM
Component Parts Location
INFOID:0000000003317536
Component Description
INFOID:0000000003305996
TRANSAXLE ASSEMBLY
JPDIA0621GB
Revision: 2008 October
2009 Murano
LOCK-UP AND SELECT CONTROL SYSTEM
TM-25
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
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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
Lock-up select solenoid valve
Primary speed sensor
Secondary speed sensor
CVT fluid temperature sensor
PNP switch
Forward clutch
TM-13, "Component Description"
Reverse brake
Torque converter
Name
Function
TCM
TM-17, "Component Description"
Accelerator pedal position sensor
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]
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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
TM-28
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
SHIFT CONTROL SYSTEM
Component Parts Location
INFOID:0000000003317537
Component Description
INFOID:0000000003306000
TRANSAXLE ASSEMBLY
JPDIA0621GB
Revision: 2008 October
2009 Murano
SHIFT CONTROL SYSTEM
TM-29
< FUNCTION DIAGNOSIS >
[CVT: RE0F09B]
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EXCEPT TRANSAXLE ASSEMBLY
Item
Function
PNP switch
Primary speed sensor
Secondary speed sensor
Step motor
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]
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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
D
: Detent rod
JPDIA0614ZZ
1.
Shift lock relay
2.
Stop lamp switch
3.
Brake pedal
A.
Shift lock solenoid
B.
Park position switch
C.
Shift lock release button
JPDIA0625ZZ
Component
Function
Shift lock solenoid
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
.
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]
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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
- 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)
1.
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.
2.
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.
1.
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
.
2.
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
1
Freeze frame data
Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175
2
Except the above items (Includes CVT related items)
3
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
.
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”
0
: 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
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