ABS INFINITI QX56 2011 Factory Service Manual

GI-16
< HOW TO USE THIS MANUAL >
ABBREVIATIONS
I
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L
M
N
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ABBREVIATION DESCRIPTIONI/M Inspection and maintenanceIA Intake air
IAC Idle air control IAT Intake air temperature
IBA Intelligent brake assist IC Ignition control
ICC Intelligent cruise control
ICM Ignition control module
IPDM E/R Intelligent power distribution module engine room ISC Idle speed controlISS Input shaft speed
ABBREVIATION DESCRIPTION KS Knock sensor
ABBREVIATION DESCRIPTION LCD Liquid crystal display
LCU Local control unitLDP Lane departure prevention
LDW Lane departure warning LED Light emitting diode LH Left-hand
LIN Local interconnect network
ABBREVIATION DESCRIPTION M/T Manual transaxle/transmission
MAF Mass airflow
MAP Manifold absolute pressure MI Malfunction indicator
MIL Malfunction indicator lamp
ABBREVIATION DESCRIPTION NOX Nitrogen oxides
ABBREVIATION DESCRIPTION O2 Oxygen
O2S Oxygen sensor
OBD On board diagnostic OC Oxidation catalytic converter
OD OverdriveOL Open loop
OSS Output shaft speed
Revision: 2010 May2011 QX56

GI-48
< BASIC INSPECTION >
CONSULT-III/GST CHECKING SYSTEM
CONSULT-III/GST CHECKING SYSTEM
DescriptionINFOID:0000000006280856
 When CONSULT-III/GST is connected with a data link connector
(A) equipped on the vehicle side, it will communicate with the con-
trol unit equipped in the vehicle and then enable various kinds of
diagnostic tests.
 Refer to “CONSULT-III Software Operation Manual” for more infor- mation.
CONSULT-III Function a nd System Application*1INFOID:0000000006280857
1 : Instrument lower panel LH
JPAIA0769ZZ
Diagnostic test
mode Function
ENGINE
TRANSMISSION AIR BAG
METER/M&A
AUTO BACK DOOR BCM
AUTO DRIVE POS. ABS
IPDM E/R
ALL MODE AWD/4WD MULTI AV
ICC/ADAS SONAR
AIR PRESSURE MONITOR AFS (ADAPTIVE LIGHT)
PRECRASH SEAT BELT HVAC
LASER
LANE CAMERA
ACCELE PEDAL ACT
E–SUS
SIDE RADAR LEFT
SIDE RADAR RIGHT CAN GATEWAY
Work Support This mode
enables a
technician to
adjust some
devices fast-
er and more
accurately.xx - - - xxx - xxxxxx - xxx - xxx -
Self Diagnostic
Results Retrieve DTC
from ECU
and display
diagnostic
items.
xxxxxxxxxxxxxxxxxxxxxxxx
Data Monitor Monitor the
input/output
signal of the
control unit in
real time.xx - xxxxxxxxxxxxxxxxxxxx -
CAN Diagnosis This mode
displays a
network diag-
nosis result
about CAN
by a diagram.xxxxxxxxxxxx -xxxxxxxxxxx
CAN Diagnosis
Support Moni-
tor It monitors
the status of
CAN commu-
nication.
xx - xxxxxxxxx -xxxxxxxxxxx
Revision: 2010 May2011 QX56

CONSULT-III/GST CHECKING SYSTEMGI-49
< BASIC INSPECTION >
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x: Applicable
*1: If GST application is equipped , functions in accordance with SAE J1 979 and ISO 15031-5 can be used.
Active Test
Send the
drive signal
from CON-
SULT-III to
the actuator.
The opera-
tion check
can be per-
formed.x - - - - xxxx - - xxxx - x - - xxxx -
DTC & SRT
confirmation The status of
system moni-
toring tests
and the self-
diagnosis
status/result
can be con-
firmed.
xx----------------------
ECU Identifica-
tion Display the
ECU identifi-
cation num-
ber (part
number etc.)
of the select-
ed system.
xxx - xxxxxxxxxxxxxxxxxxxx
Function Test This mode
can show re-
sults of self-
diagnosis of
ECU with ei-
ther “OK” or
“NG”. For en-
gine, more
practical
tests regard-
ing sensors/
switches and/
or actuators
are available.xxx----x----------------
Configuration Function to
READ/
WRITE vehi-
cle configura-
tion.-----x----x------------x
Special
Function Other results
or histories,
etc. that are
recorded in
ECU are dis-
played.
-xxx--------------------
Diagnostic test
mode Function
ENGINE
TRANSMISSION AIR BAG
METER/M&A
AUTO BACK DOOR
BCM
AUTO DRIVE POS. ABS
IPDM E/R
ALL MODE AWD/4WD
MULTI AV
ICC/ADAS SONAR
AIR PRESSURE MONITOR AFS (ADAPTIVE LIGHT)
PRECRASH SEAT BELT HVAC
LASER
LANE CAMERA
ACCELE PEDAL ACT E–SUS
SIDE RADAR LEFT
SIDE RADAR RIGHT CAN GATEWAY
Revision: 2010 May2011 QX56

HA-4
< PRECAUTION >
PRECAUTIONS
5. When the repair work is completed, re-connect both battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Precaution for Procedure without Cowl Top CoverINFOID:0000000006276138
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
Precautions For Refrigerant System ServiceINFOID:0000000006276139
GENERAL REFRIGERANT PRECAUTION
WARNING:
 Never breathe A/C refrigerant an d lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Use only approved reco very/recycling equipment to discharge HFC-134a (R-134a) refrigerant.
Ventilate work area before resuming service if acci dental system discharge occurs. Additional health
and safety information may be obtained from refrigerant and lubricant manufacturers.
 Never release refrigerant into the air. Use appro ved recovery/recycling recharging equipment to cap-
ture the refrigerant each time an ai r conditioning system is discharged.
 Wear always eye and hand protection (goggles and gloves) when working with any refrigerant or air
conditioning system.
 Never store or heat refrigerant containers above 52 °C (126 °F).
 Never heat a refrigerant container with an open flame; Place the bottom of the container in a warm
pail of water if container warming is required.
 Never intentionally drop, puncture, or incinerate refrigerant containers.
 Keep refrigerant away from open flames: pois onous gas is produced if refrigerant burns.
 Refrigerant displaces oxygen, therefore be certain to work in well ventilated areas to prevent suffo-
cation.
 Never pressure test or leakage test HFC-134a (R- 134a) service equipment and/or vehicle air condi-
tioning systems with compressed air during repair. Some mixtures of air and HFC-134a (R-134a)
have been shown to be combusti ble at elevated pressures. These mixtures, if ignited, may cause
injury or property damage. Additional health and safety information may be obtained from refriger-
ant manufacturers.
WORKING WITH HFC-134a (R-134a)
CAUTION:
 CFC-12 (R-12) refrigerant and HFC-134a (R-134a) re frigerant are not compatible. These regrigerants
must never be mixed, even in the smallest amount s. Compressor malfunction is likely occur if the
refrigerants are mixed.
 Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) compo-
nents. Compressor malfunction is likely to occur if lubricant other than that specified is used.
 The specified HFC-134a (R-134a) lu bricant rapidly absorbs moisture from the atmosphere. The fol-
lowing handling precauti ons must be observed:
- Cap (seal) immediately the compon ent to minimize the entry of moisture from the atmosphere when
removing refrigerant components from a vehicle.
- Never remove the caps (unseal) until just before co nnecting the components when installing refrig-
erant components to a vehicle. Connect all refr igerant loop components as quickly as possible to
minimize the entry of moisture into system.
- Use only the specified lubricant from a sealed contai ner. Reseal immediately containers of lubricant.
Lubricant becomes moisture saturated and should not be used without proper sealing.
PIIB3706J
Revision: 2010 May2011 QX56

LAN-2
ITS Communication Circuit .....................................58
MAIN LINE BETWEEN ABS AND DLC CIR-
CUIT ...................................................................
60
Diagnosis Procedure ........................................... ...60
MAIN LINE BETWEEN DLC AND E-SUS CIR-
CUIT ...................................................................
61
Diagnosis Procedure ........................................... ...61
MAIN LINE BETWEEN E-SUS AND ADP CIR-
CUIT ...................................................................
62
Diagnosis Procedure ........................................... ...62
MAIN LINE BETWEEN ADP AND PWBD CIR-
CUIT ...................................................................
63
Diagnosis Procedure ........................................... ...63
MAIN LINE BETWEEN RDR-R AND RDR-L
CIRCUIT .............................................................
64
Diagnosis Procedure ........................................... ...64
MAIN LINE BETWEEN RDR-L AND LANE
CIRCUIT .............................................................
65
Diagnosis Procedure ........................................... ...65
MAIN LINE BETWEEN LANE AND APA CIR-
CUIT ...................................................................
67
Diagnosis Procedure ........................................... ...67
ECM BRANCH LINE CIRCUIT ..........................68
Diagnosis Procedure ........................................... ...68
4WD BRANCH LINE CIRCUIT ..........................69
Diagnosis Procedure ........................................... ...69
ABS BRANCH LINE CIRCUIT ..........................70
Diagnosis Procedure ........................................... ...70
TCM BRANCH LINE CIRCUIT ..........................71
Diagnosis Procedure ........................................... ...71
A-BAG BRANCH LINE CIRCUIT ......................72
Diagnosis Procedure ........................................... ...72
AFS BRANCH LINE CIRCUIT ...........................73
Diagnosis Procedure ........................................... ...73
AV BRANCH LINE CIRCUIT .............................74
Diagnosis Procedure ........................................... ...74
BCM BRANCH LINE CIRCUIT ..........................75
Diagnosis Procedure ........................................... ...75
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 1) .................................
76
Diagnosis Procedure ........................................... ...76
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 2) .................................
77
Diagnosis Procedure ........................................... ...77
DLC BRANCH LINE CIRCUIT ..........................78
Diagnosis Procedure ............................................ ...78
HVAC BRANCH LINE CIRCUIT ........................79
Diagnosis Procedure ............................................ ...79
M&A BRANCH LINE CIRCUIT ..........................80
Diagnosis Procedure ............................................ ...80
STRG BRANCH LINE CIRCUIT ........................81
Diagnosis Procedure ............................................ ...81
TPMS BRANCH LINE CIRCUIT ........................82
Diagnosis Procedure ............................................ ...82
IPDM-E BRANCH LINE CIRCUIT .....................83
Diagnosis Procedure ............................................ ...83
ADP BRANCH LINE CIRCUIT ..........................84
Diagnosis Procedure ............................................ ...84
PSB BRANCH LINE CIRCUIT ..........................85
Diagnosis Procedure ............................................ ...85
E-SUS BRANCH LINE CIRCUIT .......................86
Diagnosis Procedure ............................................ ...86
ICC BRANCH LINE CIRCUIT ............................87
Diagnosis Procedure ............................................ ...87
PWBD BRANCH LINE CIRCUIT .......................88
Diagnosis Procedure ............................................ ...88
RDR-R BRANCH LINE CIRCUIT ......................89
Diagnosis Procedure ............................................ ...89
RDR-L BRANCH LINE CIRCUIT .......................90
Diagnosis Procedure ............................................ ...90
LANE BRANCH LINE CIRCUIT ........................91
Diagnosis Procedure ............................................ ...91
APA BRANCH LINE CIRCUIT ..........................92
Diagnosis Procedure ............................................ ...92
LASER BRANCH LINE CIRCUIT ......................93
Diagnosis Procedure ............................................ ...93
CAN COMMUNICATION CIRCUIT ...................94
Diagnosis Procedure ............................................ ...94
CAN COMMUNICATION CIRCUIT 1 ................96
Diagnosis Procedure ............................................ ...96
CAN COMMUNICATION CIRCUIT 2 ................98
Diagnosis Procedure ............................................ ...98
ITS COMMUNICATION CIRCUIT .....................100
Diagnosis Procedure ............................................ .100
CAN GATEWAY
PRECAUTION ............... ............................
102
PRECAUTIONS .............................................. ..102
Revision: 2010 May2011 QX56

LAN
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Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................
..
102
SYSTEM DESCRIPTION ...........................103
COMPONENT PARTS ................................... ..103
Component Parts Location .................................. ..103
SYSTEM ...........................................................104
System Description ............................................. ..104
DIAGNOSIS SYSTEM (CAN GATEWAY) .......105
CONSULT-III Function ........................................ ..105
ECU DIAGNOSIS INFORMATION ............106
CAN GATEWAY ............................................. ..106
Reference Value ................................................. ..106
DTC Inspection Priority Chart .............................106
DTC Index ............................................................106
WIRING DIAGRAM ....................................108
CAN GATEWAY SYSTEM ............................. ..108
Wiring Diagram ................................................... ..108
BASIC INSPECTION .................................110
ADDITIONAL SERVICE WHEN REPLACING
CAN GATEWAY ............................................. ..
110
Description .......................................................... ..110
Work Procedure ....................................................110
CONFIGURATION (CAN GATEWAY) .............111
Description .......................................................... ..111
Work Procedure ....................................................111
DTC/CIRCUIT DIAGNOSIS .......................113
U1000 CAN COMM CIRCUIT ......................... ..113
Description .......................................................... ..113
DTC Logic .............................................................113
Diagnosis Procedure .............................................113
U1010 CONTROL UNIT (CAN) ........................114
Description .......................................................... ..114
DTC Logic .............................................................114
Diagnosis Procedure .............................................114
B2600 CONFIG ERROR ..................................115
Description .......................................................... ..115
DTC Logic .............................................................115
Diagnosis Procedure .............................................115
POWER SUPPLY AND GROUND CIRCUIT ....116
Diagnosis Procedure ........................................... ..116
REMOVAL AND INSTALLATION .............117
CAN GATEWAY ............................................. ..117
Removal and Installation ..................................... ..117
CAN SYSTEM (TYPE 1)
DTC/CIRCUIT DIAGNOSIS .......................
118
MAIN LINE BETWEEN ABS AND DLC CIR-
CUIT ................................................................
118
Diagnosis Procedure ........................................... ..118
MAIN LINE BETWEEN DLC AND E-SUS CIR-
CUIT ................................................................
119
Diagnosis Procedure .............................................119
MAIN LINE BETWEEN E-SUS AND ADP CIR-
CUIT ................................................................
120
Diagnosis Procedure .............................................120
ECM BRANCH LINE CIRCUIT .......................121
Diagnosis Procedure .............................................121
ABS BRANCH LINE CIRCUIT ........................122
Diagnosis Procedure .............................................122
TCM BRANCH LINE CIRCUIT ........................123
Diagnosis Procedure .............................................123
A-BAG BRANCH LINE CIRCUIT ....................124
Diagnosis Procedure .............................................124
AV BRANCH LINE CIRCUIT ..........................125
Diagnosis Procedure .............................................125
BCM BRANCH LINE CIRCUIT .......................126
Diagnosis Procedure .............................................126
DLC BRANCH LINE CIRCUIT ........................127
Diagnosis Procedure .............................................127
HVAC BRANCH LINE CIRCUIT .....................128
Diagnosis Procedure .............................................128
M&A BRANCH LINE CIRCUIT .......................129
Diagnosis Procedure .............................................129
STRG BRANCH LINE CIRCUIT .....................130
Diagnosis Procedure .............................................130
TPMS BRANCH LINE CIRCUIT .....................131
Diagnosis Procedure .............................................131
IPDM-E BRANCH LINE CIRCUIT ...................132
Diagnosis Procedure .............................................132
ADP BRANCH LINE CIRCUIT ........................133
Diagnosis Procedure .............................................133
E-SUS BRANCH LINE CIRCUIT ....................134
Diagnosis Procedure .............................................134
PWBD BRANCH LINE CIRCUIT ....................135
Diagnosis Procedure .............................................135
CAN COMMUNICATION CIRCUIT .................136
Diagnosis Procedure .............................................136
Revision: 2010 May2011 QX56

LAN-4
CAN SYSTEM (TYPE 2)
DTC/CIRCUIT DIAGNOSIS ...................... ..
138
MAIN LINE BETWEEN ABS AND DLC CIR-
CUIT ................................................................ .
138
Diagnosis Procedure ........................................... ..138
MAIN LINE BETWEEN ADP AND PWBD CIR-
CUIT .................................................................
139
Diagnosis Procedure ........................................... ..139
MAIN LINE BETWEEN RDR-R AND RDR-L
CIRCUIT ...........................................................
140
Diagnosis Procedure ........................................... ..140
MAIN LINE BETWEEN RDR-L AND LANE
CIRCUIT ...........................................................
141
Diagnosis Procedure ........................................... ..141
MAIN LINE BETWEEN LANE AND APA CIR-
CUIT .................................................................
143
Diagnosis Procedure ........................................... ..143
ECM BRANCH LINE CIRCUIT ........................144
Diagnosis Procedure ........................................... ..144
ABS BRANCH LINE CIRCUIT ........................145
Diagnosis Procedure ........................................... ..145
TCM BRANCH LINE CIRCUIT ........................146
Diagnosis Procedure ........................................... ..146
A-BAG BRANCH LINE CIRCUIT ....................147
Diagnosis Procedure ........................................... ..147
AFS BRANCH LINE CIRCUIT .........................148
Diagnosis Procedure ........................................... ..148
AV BRANCH LINE CIRCUIT ...........................149
Diagnosis Procedure ........................................... ..149
BCM BRANCH LINE CIRCUIT ........................150
Diagnosis Procedure ........................................... ..150
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 1) ...............................
151
Diagnosis Procedure ........................................... ..151
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 2) ...............................
152
Diagnosis Procedure ........................................... ..152
DLC BRANCH LINE CIRCUIT .........................153
Diagnosis Procedure ........................................... ..153
HVAC BRANCH LINE CIRCUIT ......................154
Diagnosis Procedure ........................................... ..154
M&A BRANCH LINE CIRCUIT ........................155
Diagnosis Procedure ........................................... ..155
STRG BRANCH LINE CIRCUIT ......................156
Diagnosis Procedure ............................................ .156
TPMS BRANCH LINE CIRCUIT .......................157
Diagnosis Procedure ............................................ .157
IPDM-E BRANCH LINE CIRCUIT ....................158
Diagnosis Procedure ............................................ .158
ADP BRANCH LINE CIRCUIT .........................159
Diagnosis Procedure ............................................ .159
PSB BRANCH LINE CIRCUIT .........................160
Diagnosis Procedure ............................................ .160
E-SUS BRANCH LINE CIRCUIT ......................161
Diagnosis Procedure ............................................ .161
ICC BRANCH LINE CIRCUIT ...........................162
Diagnosis Procedure ............................................ .162
PWBD BRANCH LINE CIRCUIT ......................163
Diagnosis Procedure ............................................ .163
RDR-R BRANCH LINE CIRCUIT .....................164
Diagnosis Procedure ............................................ .164
RDR-L BRANCH LINE CIRCUIT ......................165
Diagnosis Procedure ............................................ .165
LANE BRANCH LINE CIRCUIT .......................166
Diagnosis Procedure ............................................ .166
APA BRANCH LINE CIRCUIT .........................167
Diagnosis Procedure ............................................ .167
LASER BRANCH LINE CIRCUIT .....................168
Diagnosis Procedure ............................................ .168
CAN COMMUNICATION CIRCUIT 1 ...............169
Diagnosis Procedure ............................................ .169
CAN COMMUNICATION CIRCUIT 2 ...............171
Diagnosis Procedure ............................................ .171
ITS COMMUNICATION CIRCUIT .....................173
Diagnosis Procedure ............................................ .173
CAN SYSTEM (TYPE 3)
DTC/CIRCUIT DIAGNOSIS .......................
175
MAIN LINE BETWEEN ABS AND DLC CIR-
CUIT ................................................................ ..
175
Diagnosis Procedure ............................................ .175
MAIN LINE BETWEEN DLC AND E-SUS CIR-
CUIT ..................................................................
176
Diagnosis Procedure ............................................ .176
MAIN LINE BETWEEN E-SUS AND ADP CIR-
CUIT ..................................................................
177
Diagnosis Procedure ............................................ .177
ECM BRANCH LINE CIRCUIT .........................178
Revision: 2010 May2011 QX56

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Diagnosis Procedure ...........................................
..
178
4WD BRANCH LINE CIRCUIT .........................179
Diagnosis Procedure ........................................... ..179
ABS BRANCH LINE CIRCUIT .........................180
Diagnosis Procedure ........................................... ..180
TCM BRANCH LINE CIRCUIT .........................181
Diagnosis Procedure ........................................... ..181
A-BAG BRANCH LINE CIRCUIT .....................182
Diagnosis Procedure ........................................... ..182
AV BRANCH LINE CIRCUIT ............................183
Diagnosis Procedure ........................................... ..183
BCM BRANCH LINE CIRCUIT ........................184
Diagnosis Procedure ........................................... ..184
DLC BRANCH LINE CIRCUIT .........................185
Diagnosis Procedure ........................................... ..185
HVAC BRANCH LINE CIRCUIT ......................186
Diagnosis Procedure ........................................... ..186
M&A BRANCH LINE CIRCUIT ........................187
Diagnosis Procedure ........................................... ..187
STRG BRANCH LINE CIRCUIT .......................188
Diagnosis Procedure ........................................... ..188
TPMS BRANCH LINE CIRCUIT .......................189
Diagnosis Procedure ........................................... ..189
IPDM-E BRANCH LINE CIRCUIT ....................190
Diagnosis Procedure ........................................... ..190
ADP BRANCH LINE CIRCUIT .........................191
Diagnosis Procedure ........................................... ..191
E-SUS BRANCH LINE CIRCUIT ......................192
Diagnosis Procedure ........................................... ..192
PWBD BRANCH LINE CIRCUIT ......................193
Diagnosis Procedure ........................................... ..193
CAN COMMUNICATION CIRCUIT ..................194
Diagnosis Procedure ........................................... ..194
CAN SYSTEM (TYPE 4)
DTC/CIRCUIT DIAGNOSIS .......................
196
MAIN LINE BETWEEN ABS AND DLC CIR-
CUIT ................................................................ ..
196
Diagnosis Procedure ........................................... ..196
MAIN LINE BETWEEN ADP AND PWBD CIR-
CUIT ..................................................................
197
Diagnosis Procedure ........................................... ..197
MAIN LINE BETWEEN RDR-R AND RDR-L
CIRCUIT ......................................................... ..
198
Diagnosis Procedure ........................................... ..198
MAIN LINE BETWEEN RDR-L AND LANE
CIRCUIT ..........................................................
199
Diagnosis Procedure ........................................... ..199
MAIN LINE BETWEEN LANE AND APA CIR-
CUIT ................................................................
201
Diagnosis Procedure .............................................201
ECM BRANCH LINE CIRCUIT .......................202
Diagnosis Procedure .............................................202
4WD BRANCH LINE CIRCUIT .......................203
Diagnosis Procedure ........................................... ..203
ABS BRANCH LINE CIRCUIT ........................204
Diagnosis Procedure .............................................204
TCM BRANCH LINE CIRCUIT ........................205
Diagnosis Procedure .............................................205
A-BAG BRANCH LINE CIRCUIT ....................206
Diagnosis Procedure .............................................206
AFS BRANCH LINE CIRCUIT ........................207
Diagnosis Procedure .............................................207
AV BRANCH LINE CIRCUIT ..........................208
Diagnosis Procedure .............................................208
BCM BRANCH LINE CIRCUIT .......................209
Diagnosis Procedure .............................................209
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 1) ..............................
210
Diagnosis Procedure .............................................210
CGW BRANCH LINE CIRCUIT (CAN COM-
MUNICATION CIRCUIT 2) ..............................
211
Diagnosis Procedure .............................................211
DLC BRANCH LINE CIRCUIT ........................212
Diagnosis Procedure .............................................212
HVAC BRANCH LINE CIRCUIT .....................213
Diagnosis Procedure .............................................213
M&A BRANCH LINE CIRCUIT .......................214
Diagnosis Procedure .............................................214
STRG BRANCH LINE CIRCUIT .....................215
Diagnosis Procedure .............................................215
TPMS BRANCH LINE CIRCUIT .....................216
Diagnosis Procedure .............................................216
IPDM-E BRANCH LINE CIRCUIT ...................217
Diagnosis Procedure .............................................217
ADP BRANCH LINE CIRCUIT ........................218
Diagnosis Procedure .............................................218
Revision: 2010 May2011 QX56

LAN-12
< SYSTEM DESCRIPTION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: TCM branch line open circuit
Example: Data link connector branch line open circuit
SKIB8738E
Unit name Major symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM Reverse warning chime does not sound.
EPS control unit No rmal operation.
Combination meter  Shift position indicator and OD 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.
SKIB8739E
Revision: 2010 May2011 QX56

LAN
TROUBLE DIAGNOSISLAN-13
< SYSTEM DESCRIPTION > [CAN FUNDAMENTAL]
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NOTE:
 When data link connector branch line is open, transmi
ssion and reception of CAN communication signals
are not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
 The model (all units on CAN communication system are Diag on CAN) cannot perform CAN diagnosis with
CONSULT-III if the following error occurs. The error is judged by the symptom.
Example: Main Line Between Data Link Connector and ABS Actuator and Electr ic Unit (Control Unit) Open Circuit
Unit name Major symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric
unit (control unit)
TCM
IPDM E/R
Error Difference of symptom
Data link connector branch line open circuit Normal operation.
CAN-H, CAN-L harness short-circuit Most of the units which are connected to the CAN communication
system enter fail-safe mode or are deactivated.
SKIB8740E
Unit name Major symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM  Reverse warning chime 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.
Revision: 2010 May2011 QX56