Murano Cross Cabriolet Z51 (2012 year). Manual — part 52
LAN
TROUBLE DIAGNOSIS
LAN-13
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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With PAST
Transmission diagnosis
OK
Normal at present
UNKWN
Unable to transmit signals for 2 seconds or more.
Diagnosis not performed
Control unit name
(Reception diagnosis)
OK
Normal at present
UNKWN
Unable to receive signals for 2 seconds or more.
Diagnosis not performed
No control unit for receiving signals. (No applicable optional parts)
Item
PRESENT
Description
Item
PRESENT
PAST
Description
Transmission diagnosis
OK
OK
Normal at present and in the past
1 – 39
Normal at present, but unable to transmit signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)
UNKWN
0
Unable to transmit signals for 2 seconds or more at present.
Control unit name
(Reception diagnosis)
OK
OK
Normal at present and in the past
1 – 39
Normal at present, but unable to receive signals for 2 seconds or more
in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)
UNKWN
0
Unable to receive signals for 2 seconds or more at present.
Not diag-
nosed
–
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional parts)
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2012 Murano CrossCabriolet
LAN-14
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
How to Use CAN Communication Signal Chart
INFOID:0000000007566327
The CAN communication signal chart lists the signals transmitted/received among control units. It is useful for
detecting the root cause by finding a signal related to the symptom, and by checking transmission and recep-
tion unit.
JSMIA0446GB
Revision: 2013 February
2012 Murano CrossCabriolet
LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-15
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis Flow Chart
INFOID:0000000007566328
Trouble Diagnosis Procedure
INFOID:0000000007566329
INTERVIEW WITH CUSTOMER
Interview with the customer is important to detect the root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.
Points in interview
• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment
• Result: Symptom
Notes for checking error symptoms:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates
tachometer functions normally.
• When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.
JSMIA0528GB
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LAN-16
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
• Indication of the combination meter is important to detect the root cause because it is the most obvious to
the customer, and it performs CAN communication with many units.
INSPECTION OF VEHICLE CONDITION
Check whether the symptom is reproduced or not.
NOTE:
Do not turn the ignition switch OFF or disconnect the battery cable while reproducing the error. The error may
temporarily correct itself, making it difficult to determine the root cause.
CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment.
NOTE:
• This chart is used if CONSULT does not automatically recognize CAN system type.
• There are two styles for CAN system type specification charts. Depending on the number of available sys-
tem types, either style A or style B may be used.
CAN System Type Specification Chart (Style A)
NOTE:
SKIB8717E
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LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-17
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
CAN System Type Specification Chart (Style B)
NOTE:
JSMIA0529GB
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LAN-18
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
CREATE INTERVIEW SHEET
Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview
sheet.
JSMIA0530GB
Revision: 2013 February
2012 Murano CrossCabriolet
LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-19
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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Interview Sheet (Example)
DETECT THE ROOT CAUSE
CAN diagnosis function of CONSULT detects the root cause.
JSMIA0531GB
Revision: 2013 February
2012 Murano CrossCabriolet
LAN-20
< HOW TO USE THIS MANUAL >
[CAN]
HOW TO USE THIS SECTION
HOW TO USE THIS MANUAL
HOW TO USE THIS SECTION
Information
INFOID:0000000007566330
• “CAN” of LAN Section describes information peculiar to a vehicle and inspection procedures.
• For trouble diagnosis procedure, refer to
LAN-15, "Trouble Diagnosis Flow Chart"
of “CAN FUNDAMEN-
TAL”.
Abbreviation List
INFOID:0000000007566331
Unit name abbreviations in CONSULT CAN diagnosis and in this section are as per the following list.
Abbreviation
Unit name
4WD
AWD control unit
A-BAG
Air bag diagnosis sensor unit
ABS
ABS actuator and electric unit (control unit)
ADP
Driver seat control unit
AV
AV control unit
BCM
BCM
C/ROOF
Soft top control unit
DLC
Data link connector
ECM
ECM
HVAC
A/C auto amp.
IPDM-E
IPDM E/R
M&A
Combination meter
STRG
Steering angle sensor
TCM
TCM
Revision: 2013 February
2012 Murano CrossCabriolet
LAN
PRECAUTIONS
LAN-21
< PRECAUTION >
[CAN]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000007566332
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.
WARNING:
Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
Service Procedure Precautions for Models with a Pop-up Roll Bar
INFOID:0000000007566333
WARNING:
Always observe the following items for preventing accidental activation.
• Risk of passenger injury or death may increase if the pop-up roll bar does not deploy during a roll
over collision. In order to reduce the chance of an incident where the pop-up roll bar is inoperative,
all maintenance must be performed by a NISSAN or INFINITI dealer.
• Before removing and installing the pop-up roll bar component parts and harness, always turn the
ignition switch OFF, disconnect the battery negative terminal, and wait for 3 minutes or more. (The
purpose of this operation is to discharge electricity that is accumulated in the auxiliary power supply
circuit in the air bag diagnosis sensor unit.)
• When repairing, removing, and installing a pop-up roll bar, always refer to SRS AIR BAG and SRS
AIR BAG CONTROL warnings in the Service Manual.
Precaution for Battery Service
INFOID:0000000007566334
Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interfer-
ence between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.
Precautions for Trouble Diagnosis
INFOID:0000000007566335
CAUTION:
Follow the instructions listed below. Failure to do this may cause damage to parts:
Revision: 2013 February
2012 Murano CrossCabriolet
LAN-22
< PRECAUTION >
[CAN]
PRECAUTIONS
• Never apply 7.0 V or more to the measurement terminal.
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness.
Precautions for Harness Repair
INFOID:0000000007566336
• Solder the repaired area and wrap tape around the soldered area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
• Bypass connection is never allowed at the repaired area.
NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost.
• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-
tion line.
SKIB8766E
SKIB8767E
Revision: 2013 February
2012 Murano CrossCabriolet
LAN
COMPONENT PARTS
LAN-23
< SYSTEM DESCRIPTION >
[CAN]
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts Location
INFOID:0000000007566337
1.
Air bag diagnosis sensor unit
2.
A/C auto amp.
3.
AV control unit
4.
ABS actuator and electric unit (con-
trol unit)
5.
AWD control unit
6.
TCM
7.
ECM
8.
IPDM E/R
9.
BCM
10. Data link connector
11.
Combination meter
12. Steering angle sensor
13. Driver seat control unit
14. Soft top control unit
JSMIA0748ZZ
Revision: 2013 February
2012 Murano CrossCabriolet
LAN-24
< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
SYSTEM
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM : System Description
INFOID:0000000007566338
SYSTEM DIAGRAM
DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
Can Communication Signal Generation
• Termination circuits (resistors) are connected across the CAN communication system. When transmitting a
CAN communication signal, each control unit passes a current to the CAN-H line and the current returns to
the CAN-L line.
JSMIA0749GB
JSMIA0450GB
Revision: 2013 February
2012 Murano CrossCabriolet
LAN
SYSTEM
LAN-25
< SYSTEM DESCRIPTION >
[CAN]
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• The current flows separately into the termination circuits connected
across the CAN communication system and the termination cir-
cuits drop voltage to generate a potential difference between the
CAN-H line and the CAN-L line.
NOTE:
A signal with no current passage is called “Recessive” and one
with current passage is called “Dominant”.
• The system produces digital signals for signal communications, by
using the potential difference.
The Construction Of Can Communication Signal (Message)
CAN COMMUNICATION LINE
JSMIA0543GB
JSMIA0544ZZ
JSMIA0545ZZ
No.
Message name
Description
1
Start of frame (1 bit)
Start of message.
2
Arbitration of field (11 bit)
Priorities of message-sending are shown when there is a pos-
sibility that multiple messages are sent at the same time.
3
Control field (6 bit)
Signal quantity in data field is shown.
4
Data field (0-64 bit)
Actual signal is shown.
5
CRC field (16 bit)
• The transmitting control unit calculates sending data in ad-
vance and writes the calculated value in a message.
• The receiving control unit calculates received data and judg-
es that the data reception is normal when the calculated val-
ue is the same as the value written in the sent data.
6
ACK field (2 bit)
The completion of normal reception is sent to the transmitting
unit.
7
End of frame (7 bit)
End of message.
Revision: 2013 February
2012 Murano CrossCabriolet
LAN-26
< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
The CAN communication line is a twisted pair wire consisting of
strands of CAN-H (1) and CAN-L (2) and has noise immunity.
NOTE:
The CAN communication system has the characteristics of noise-resistant because this system produces dig-
ital signals by using the potential difference between the CAN-H line and the CAN-L line and has the twisted
pair wire structure.
Since the CAN-H line and the CAN-L line are always adjacent to
each other, the same degree of noise occurs, respectively, when a
noise (1) occurs. Although the noise changes the voltage, the poten-
tial difference (2) between the CAN-H line and the CAN-L line is
insensitive to noise. Therefore, noise-resistant signals can be
obtained.
CAN SIGNAL COMMUNICATIONS
Each control unit of the CAN communication system transmits signals through the CAN communication con-
trol circuit included in the control unit and receives only necessary signals from each control unit to perform
various kinds of control.
• Example: Transmitted signals
JSMIA0382ZZ
JSMIA0383ZZ
JSMIA0576GB
Revision: 2013 February
2012 Murano CrossCabriolet
LAN
SYSTEM
LAN-27
< SYSTEM DESCRIPTION >
[CAN]
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• Example: Received signals
NOTE:
The above signal names and signal communications are provided for reference purposes. For CAN communi-
cations signals of this vehicle, refer to
LAN-28, "CAN COMMUNICATION SYSTEM : CAN Communication
.
CAN COMMUNICATION SYSTEM : CAN Communication Control Circuit
INFOID:0000000007566339
CAN communication control circuit is incorporated into the control unit and transmits/receives CAN communi-
cation signals.
JSMIA0577GB
JSMIA0453GB
Component
System description
CAN controller
It controls CAN communication signal transmission and reception, error detection, etc.
Transceiver IC
It converts digital signal into CAN communication signal, and CAN communication signal into digital
signal.
Revision: 2013 February
2012 Murano CrossCabriolet
LAN-28
< SYSTEM DESCRIPTION >
[CAN]
SYSTEM
*: These are the only control units wired with both ends of CAN communication system.
CAN COMMUNICATION SYSTEM : CAN System Specification Chart
INFOID:0000000007566340
Determine CAN system type from the following specification chart.
NOTE:
Refer to
LAN-15, "Trouble Diagnosis Procedure"
for how to use CAN system specification chart.
CAN COMMUNICATION SYSTEM : CAN Communication Signal Chart
INFOID:0000000007566341
LAN-14, "How to Use CAN Communication Signal Chart"
for how to use CAN communication signal
chart.
NOTE:
Refer to
for the abbreviations of the connecting units.
T: Transmit
R: Receive
Noise filter
It eliminates noise of CAN communication signal.
Termination circuit
*
(Resistance of approx. 120
Ω
)
Generates a potential difference between CAN-H and CAN-L.
Component
System description
Body type
Convertible
Axle
AWD
Engine
VQ35DE
Transmission
CVT
Brake control
VDC
CAN system type
1
Signal name
EC
M
ADP
C/ROO
F
4WD
AV
HV
AC
M&A
A-BAG
BC
M
ST
R
G
ABS
TCM
IP
DM-E
A/C compressor request signal
T
R
Accelerator pedal position signal
T
R
R
R
ASCD CRUISE indicator signal
T
R
ASCD operation signal
T
R
ASCD SET indicator signal
T
R
Closed throttle position signal
T
R
Cooling fan speed request signal
T
R
Engine and CVT integrated control signal
T
R
R
T
Engine coolant temperature signal
T
R
R
R
Engine speed signal
T
R
R
R
R
Engine status signal
T
R
R
Fuel consumption monitor signal
T
R
R
Fuel filler cap warning display signal
T
R
Malfunctioning indicator lamp signal
T
R
Power generation command value signal
T
R
System setting signal
T
R
R
T
R
R
T
Meter display signal
T
R
R
T
Revision: 2013 February
2012 Murano CrossCabriolet
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