Qashqai J11. Lan system — part 1
LAN
HOW TO USE THIS SECTION
LAN-17
< HOW TO USE THIS MANUAL >
[CAN FUNDAMENTAL]
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HOW TO USE THIS MANUAL
HOW TO USE THIS SECTION
Information
INFOID:0000000010272903
• “CAN FUNDAMENTAL” of LAN Section describes the basic knowledge of the CAN communication system
and the method of trouble diagnosis.
• For information peculiar to a vehicle and inspection procedure, refer to “CAN”.
LAN-18
< PRECAUTION >
[CAN FUNDAMENTAL]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precautions for Trouble Diagnosis
INFOID:0000000010272904
CAUTION:
Follow the instructions listed below. Failure to do this may cause damage to parts:
• 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:0000000010272905
• 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
LAN
SYSTEM
LAN-19
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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SYSTEM DESCRIPTION
SYSTEM
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM : System Description
INFOID:0000000010272906
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.
DIAG ON CAN
DIAG ON CAN : System Description
INFOID:0000000010272907
SYSTEM DIAGRAM
JSMIA0526GB
LAN-20
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
SYSTEM
DESCRIPTION
“Diag on CAN” is a diagnosis method which uses the CAN communication line for the communication between
the control unit and the diagnostic tool.
Name
Harness
Description
DDL1
Tx
Rx
For communications with the diagnostic tool. (CAN-H and CAN-L are used for control-
ling)
DDL2
K-LINE
For communications with the diagnostic tool. (CAN-H and CAN-L are used for control-
ling)
Diag on CAN
CAN-H
CAN-L
For communications with the diagnostic tool. (CAN-H and CAN-L are also used for con-
trol and diagnoses.)
LAN
TROUBLE DIAGNOSIS
LAN-21
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Component Description
INFOID:0000000010272908
Condition of Error Detection
INFOID:0000000010272909
DTC (e.g. U1000 and U1001) of CAN communication is indicated on SELF-DIAG RESULTS on CONSULT if a
CAN communication signal is not transmitted or received between units for 2 seconds or more.
CAN COMMUNICATION SYSTEM ERROR
• CAN communication line open (CAN-H, CAN-L, or both)
• CAN communication line short (ground, between CAN communication lines, other harnesses)
• Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN DTC OF CAN COMMUNICATION IS INDICATED EVEN THOUGH CAN COMMUNICATION
SYSTEM IS NORMAL
• Removal/installation of parts: Error may be detected when removing and installing CAN communication unit
and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)
• Fuse blown out (removed): CAN communication of the unit may cease.
• Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition
switch ON (Depending on the control unit which carries out CAN communication).
• Error may be detected if the power supply circuit of the control unit, which carries out CAN communication,
malfunctions (Depending on the control unit which carries out CAN communication).
• Error may be detected if reprogramming is not completed normally.
NOTE:
CAN communication system is normal if DTC of CAN communication is indicated on SELF-DIAG RESULTS of
CONSULT under the above conditions. Erase the memory of the self-diagnosis of each control unit.
JSMIA0527GB
Component
Description
Main line
CAN communication line between splices
Branch line
CAN communication line between splice and a control unit
Splice
A point connecting a branch line with a main line
Termination circuit
Circuit connected across the CAN communication system. (Resistor)
LAN-22
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Symptom When Error Occurs in CAN Communication System
INFOID:0000000010272910
In CAN communication system, multiple control units mutually transmit and receive signals. Each control unit
cannot transmit and receive signals if any error occurs on CAN communication line. Under this condition, mul-
tiple control units related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
Each vehicle differs in symptom of each control unit under fail-safe mode and CAN communication line wiring.
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control Unit) Open Circuit
JSMIA0442GB
Unit name
Major symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
• Reverse warning buzzer does not sound.
• The front wiper moves under continuous operation mode even though the front wip-
er switch being in the intermittent position.
EPS control unit
The steering effort increases.
Combination meter
• The shift position indicator and OD OFF indicator turn OFF.
• The speedometer is inoperative.
• The odo/trip meter stops.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
LAN
TROUBLE DIAGNOSIS
LAN-23
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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Example: TCM Branch Line Open Circuit
NOTE:
The model (all control units on CAN communication system are Diag on CAN) cannot perform CAN diagnosis
with CONSULT if the following error occurs. The error is judged by the symptom.
Example: Data Link Connector Branch Line Open Circuit
JSMIA0443GB
Unit name
Major symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
Reverse warning buzzer does not sound.
EPS control unit
Normal operation.
Combination meter
• Shift position indicator and O/D OFF indicator turn OFF.
• Warning lamps turn ON.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
Normal operation.
Error
Difference of symptom
Data link connector branch line open circuit
Normal operation.
CAN-H, CAN-L harness short-circuit
Most of the control units which are connected to the CAN commu-
nication system enter fail-safe mode or are deactivated.
JSMIA0444GB
LAN-24
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
NOTE:
When data link connector branch line is open, transmission and reception of CAN communication signals are
not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
Example: CAN-H, CAN-L Harness Short Circuit
CAN Diagnosis with CONSULT
INFOID:0000000010272911
CAN diagnosis on CONSULT extracts the root cause by receiving the following information.
Unit name
Major symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
JSMIA0445GB
Unit name
Major symptom
ECM
• Engine torque limiting is affected, and shift harshness increases.
• Engine speed drops.
BCM
• Reverse warning buzzer does not sound.
• The front wiper moves under continuous operation mode even though the front
wiper switch being in the intermittent position.
• The room lamp does not turn ON.
• The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch OFF.)
• The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch OFF.)
EPS control unit
The steering effort increases.
Combination meter
• The tachometer and the speedometer do not move.
• Warning lamps turn ON.
• Indicator lamps do not turn ON.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
LAN
TROUBLE DIAGNOSIS
LAN-25
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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• Response to the system call
• Control unit diagnosis information
• Self-diagnosis
• CAN diagnostic support monitor
Self-Diagnosis
INFOID:0000000010272912
If communication signals cannot be transmitted or received among control units communicating via CAN com-
munication line, CAN communication-related DTC is displayed on the CONSULT “Self Diagnostic Result”
screen.
NOTE:
The following table shows examples of CAN communication-related DTC. For other DTC, refer to the applica-
ble sections.
CAN Diagnostic Support Monitor
INFOID:0000000010272913
MONITOR ITEM (CONSULT)
Example: CAN DIAG SUPPORT MNTR indication
Without PAST
DTC
Self-diagnosis item
(CONSULT indication)
DTC detection condition
Inspection/Action
U1000
CAN COMM CIRCUIT
ECM
When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-relat-
ed diagnosis) for 2 seconds or more.
Start the inspection. Re-
fer to the applicable sec-
tion of the indicated
control unit.
Except
for ECM
When a control unit (except for ECM) is not
transmitting or receiving CAN communication
signal for 2 seconds or more.
U1001
CAN COMM CIRCUIT
When ECM is not transmitting or receiving CAN communi-
cation signal other than OBD (emission-related diagnosis)
for 2 seconds or more.
U1002
SYSTEM COMM
When a control unit is not transmitting or receiving CAN
communication signal for 2 seconds or less.
U1010
CONTROL UNIT(CAN)
When an error is detected during the initial diagnosis for
CAN controller of each control unit.
Replace the control unit
indicating “U1010”.
JSMIA0964GB
Item
PRESENT
Description
Initial diagnosis
OK
Normal at present
NG
Control unit error (Except for some control units)
LAN-26
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
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 diagnosed
–
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional parts)
LAN
TROUBLE DIAGNOSIS
LAN-27
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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How to Use CAN Communication Signal Chart
INFOID:0000000010272914
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
LAN-28
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis Flow Chart
INFOID:0000000010272915
DESCRIPTION
DETAIL OF TROUBLE DIAGNOSIS FLOW CHART
1.
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.
JSMIA0528GB
LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-29
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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• When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.
• 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.
>> GO TO 2.
2.
INSPECTION OF VEHICLE CONDITION
Check whether the symptom is reproduced or not.
NOTE:
Do not turn the ignition switch OFF or disconnect the 12V battery cable while reproducing the error. The error
may temporarily correct itself, making it difficult to determine the root cause.
>> GO TO 3.
3.
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
LAN-30
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
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
LAN
DIAGNOSIS AND REPAIR WORKFLOW
LAN-31
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
>> GO TO 4.
4.
CREATE INTERVIEW SHEET
Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview
sheet.
NOTE:
JSMIA0530GB
LAN-32
< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
Interview Sheet (Example)
>> GO TO 5.
5.
DETECT THE ROOT CAUSE
CAN diagnosis function of CONSULT detects a root cause.
>> GO TO 6.
6.
REPAIR OR REPLACE MALFUNCTIONING PART
Repair or replace malfunctioning parts identified by CAN diagnosis function of CONSULT.
Main line>>Refer to
.
Branch line>>Refer to
Short circuit>> Refer to
.
JSMIA0531GB
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