2007 INFINITI QX56 DTC

CONSULT-II CHECKING SYSTEM
GI-35
< SERVICE INFORMATION >
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PCONSULT-II CHECKING SYSTEM
DescriptionINFOID:0000000003531490
• CONSULT-II is a hand-held type tester. When it is connected with a diagnostic connector equipped on the
vehicle side, it will communicate with the control unit equipped in the vehicle and then enable various kinds
of diagnostic tests.
• Refer to “CONSULT-II Software Operation Manual” for more information.
Function and System ApplicationINFOID:0000000003531491
x: Applicable.
*1: If equipped.Diagnostic test mode Function
ENGINE
A/T
ICC
*1
ABS
AIR BAG
IPDM E/R
BCM
AUTO DRIVE POS.
REARVIEW CAMERA
AIR LEVELIZER
ALL MODE AWD/4WD
HVAC
NVIS (NATS)
*2
NVIS (NATS BCM OR S/ENT)
*2
Work supportThis mode enables a technician to adjust some devices
faster and more accurately by following the indications on
CONSULT-II.xxxx - - xxxxx - - -
Self-diagnostic Self-diagnostic can be performed quickly. ----x---------
Self-diagnostic results Self-diagnostic results can be read and erased quickly. xxxx - xxx - xxxxx
Trouble diagnostic
recordCurrent self-diagnostic results and all trouble diagnostic
records previously stored can be read.--- - x---------
Data monitor Input/Output data in the ECM can be read. xxxx - x - xxxxx - -
Data monitor (spec) Data monitor specification can be read. x-------------
CAN diagnosis support
monitorThe communication condition of CAN communication line
can be read.xxxx - xxx - - xx - -
Active testDiagnostic Test Mode in which CONSULT-II drives some
actuators apart from the ECMs and also shifts some param-
eters in a specified range.x-xx-x-x-x----
Function testThis mode can show results of self-diagnosis of ECU with
either “OK” or “NG”. For engines, more practical tests re-
garding sensors/switches and/or actuators are available.xx-xx- --- -----
DTC & SRT confirma-
tionThe results of SRT (System Readiness Test) and the self-
diagnosis status/result can be confirmed.x-------------
DTC work supportThe operating condition to confirm Diagnosis Trouble
Codes can be selected.xx------------
ECM/ECU part number ECM/ECU part number can be read.
xxxx - -xx
xxxx - -
ECU discriminated No.Classification number of a replacement ECU can be read to
prevent an incorrect ECU from being installed.----x---------
Passenger Airbag Displays the STATUS (readiness) of the front passenger air
bag.----x---------
Configuration Sets control module parameters to match vehicle options. ------x-------
PIN read
*3This mode shows the BCM-specific 5-digit code. -------------x
Control unit
initialization
*3All registered ignition key IDs in NATS components can be
initialized and new IDs can be registered.------------x-

GI-50
< SERVICE INFORMATION >
TERMINOLOGY
TERMINOLOGY
SAE J1930 Terminology ListINFOID:0000000003531507
All emission related terms used in this publication in accordance with SAE J1930 are listed. Accordingly, new
terms, new acronyms/abbreviations and old terms are listed in the following chart.
NEW TERMNEW ACRONYM /
ABBREVIATIONOLD TERM
Air cleaner ACL Air cleaner
Barometric pressure BARO ***
Barometric pressure sensor-BCDD BAROS-BCDD BCDD
Camshaft position CMP ***
Camshaft position sensor CMPS Crank angle sensor
Canister *** Canister
Carburetor CARB Carburetor
Charge air cooler CAC Intercooler
Closed loop CL Closed loop
Closed throttle position switch CTP switch Idle switch
Clutch pedal position switch CPP switch Clutch switch
Continuous fuel injection system CFI system ***
Continuous trap oxidizer system CTOX system ***
Crankshaft position CKP ***
Crankshaft position sensor CKPS ***
Data link connector DLC ***
Data link connector for CONSULT-II DLC for CONSULT-II Diagnostic connector for CONSULT-II
Diagnostic test mode DTM Diagnostic mode
Diagnostic test mode selector DTM selector Diagnostic mode selector
Diagnostic test mode I DTM I Mode I
Diagnostic test mode II DTM II Mode II
Diagnostic trouble code DTC Malfunction code
Direct fuel injection system DFI system ***
Distributor ignition system DI system Ignition timing control
Early fuel evaporation-mixture heater EFE-mixture heater Mixture heater
Early fuel evaporation system EFE system Mixture heater control
Electrically erasable programmable read
only memoryEEPROM ***
Electronic ignition system EI system Ignition timing control
Engine control EC ***
Engine control module ECM ECCS control unit
Engine coolant temperature ECT Engine temperature
Engine coolant temperature sensor ECTS Engine temperature sensor
Engine modification EM ***
Engine speed RPM Engine speed
Erasable programmable read only memory EPROM ***
Evaporative emission canister EVAP canister Canister
Evaporative emission system EVAP system Canister control solenoid valve
Exhaust gas recirculation valve EGR valve EGR valve

IDX-3
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IDX
ALPHABETICAL INDEX
Brake fluid level ................................................. MA-28
Brake hydraulic line ........................................... BR-12
Brake inspection ................................................ MA-28
Brake lines and cables inspection ..................... MA-28
Brake master cylinder ....................................... BR-15
Brake switch ...................................... EC-572, EC-584
BRK/SW - Wiring diagram ............................... EC-585
Bulb specifications ........................................... LT-148
Bumper, front ...................................................... EI-13
Bumper, rear ....................................................... EI-15
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Cabin air filter .................................................... MA-21
Camshaft ........................................................... EM-46
Camshaft inspection .......................................... EM-49
Camshaft position sensor (PHASE) ................ EC-369
CAN - Wiring diagram .............. EC-157, AT-93, AT-94
CAN communication EC-32, EC-156, EC-159, TF-112,
RSU-6
Canister-See EVAP canister ............................. EC-36
Center case (Transfer) ....................... TF-154, TF-167
CHARGE - Wiring diagram ............................... SC-19
Charging system ............................................... SC-17
Chassis and body maintenance ........................ MA-21
Chassis and body maintenanceSchedule 1 ........ MA-8
Chassis and body maintenanceSchedule 2 ...... MA-10
CHIME - Wiring diagram ..................................... DI-41
Circuit breaker ................................................... PG-17
Clock ................................................................... DI-61
CLOCK - Wiring diagram .................................... DI-61
Closed loop control ............................. EC-26, EC-501
Closed loop control (Bank 1) ........................... EC-501
Closed loop control (Bank 2) ........................... EC-501
Clutch drum (Transfer) ....................... TF-154, TF-167
Clutch pressure switch (Transfer) ...... TF-154, TF-167
Coil spring (front) ............................................. FSU-10
Collision diagnosis .......................................... SRS-53
Combination lamp, front, removal and installation . LT-
25
Combination lamp, rear, removal and installation .. LT-
101
Combination meter ................................................ DI-5
Combination switch ............................................ LT-79
COMBSW - Wiring diagram ............................... LT-79
COMM - Wiring diagram ................................... AV-94
COMPAS - Wiring diagram ................................. DI-24
Compass ............................................................. DI-23
Component Location (auto A/C) ...................... ATC-38
Compressor clutch removal and installation . ATC-180
Compressor mounting ................................... ATC-179
Compressor precaution ................................... ATC-11
Compressor special service tool ..................... ATC-14
Condenser ..................................................... ATC-184
Connecting rod .................................................. EM-96
Connecting rod bearing clearance .................... EM-96
Connecting rod bushing clearance .................... EM-96
Console box - See Instrument panel ................... IP-10
CONSULT for VDC ......................................... BRC-27
CONSULT general information ........................... GI-37
CONSULT-II for engine ................................... EC-118
Control units (terminal arrangement) ................. PG-71
Control valve (A/T) ............................................. AT-36
Control valve (Transfer) ...................... TF-154, TF-167
Converter housing installation ............ AT-240, AT-244
COOL/F - Wiring diagram ................................ EC-507
Coolant mixture ratio ......................................... MA-12
Coolant replacement ............................ CO-10, MA-13
Cooling circuit (engine) ........................................ CO-8
Cooling fan ........................................................ CO-17
Cooling fan control ........................................... EC-504
Cooling fan motor ............................................ EC-513
Cooling unit (A/C evaporator) ....... ATC-157, ATC-186
Corrosion protection ......................................... BL-157
Crankcase ventilation system - See Positive crankcase
ventilation .......................................................... EC-46
Crankshaft ......................................................... EM-79
Crankshaft position sensor (POS) ................... EC-362
Crash zone sensor .......................................... SRS-48
CUR/SE - Wiring diagram ... EC-522, EC-529, EC-536,
EC-543
Cylinder block .................................................... EM-78
Cylinder block boring ......................................... EM-99
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D/LOCK - Wiring diagram ................................... BL-19
Data link connector for Consult ......... EC-120, EC-132
Daytime light system .......................................... LT-27
Daytime running light - See Daytime light system .. LT-
27
DEF - Wiring diagram ....................................... GW-74
Diagnosis sensor unit ...................................... SRS-51
Diagnostic trouble code (DTC) for OBD system . EC-9,
EC-54
Diagnostic trouble code (DTC) inspection priority chart
EC-91
Differential carrier assembly ............................ RFD-15
Differential gear oil replacement ........................ MA-26
Dimensions ......................................................... GI-51
Direct clutch solenoid valve ................ AT-143, AT-145
Display and amp.assembly .............................. ATC-59
Display Control Unit ........................................... AV-83
Display Unit ....................................................... AV-83
Dome light - See Interior lamp .......................... LT-110
Door glass .......................................... GW-62, GW-65
Door lock .......................................................... BL-121
Door mirror lamp ............................................... LT-110
Door trim .............................................................. EI-32
Door, front ........................................... BL-117, GW-62
Door, rear ........................................... BL-117, GW-65
Drive belt ........................................................... EM-13
Drive chain (Transfer) ......................... TF-149, TF-176
Drive pinion diff. inspection .............................. RFD-18
Drive shaft (rear) ................................................ RAX-7
Driver air bag ................................................... SRS-39
DTC work support ............................................ EC-128
DTRL - Wiring diagram ....................................... LT-31

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ALPHABETICAL INDEX
Grease .............................................................. MA-11
Ground distribution ............................................ PG-31
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H/AIM - Wiring diagram ...................................... LT-51
H/LAMP - Wiring diagram .................................... LT-9
Handling precautions for plastics ..................... BL-179
Harness connector ............................................ PG-68
Harness layout .................................................. PG-41
Hazard warning lamp ......................................... LT-63
Headlamp ............................................................. LT-5
Headlamp aiming control ................................... LT-51
Headlamp leveler - See Headlamp aiming control . LT-
51
Headlamp removal and installation .................... LT-25
Heated oxygen sensor 2 (bank 1) .... EC-276, EC-287,
EC-300
Heated oxygen sensor 2 (bank 2) .... EC-276, EC-287,
EC-300
Heated oxygen sensor 2 heater (bank 1) ........ EC-181
Heated oxygen sensor 2 heater (bank 2) ........ EC-181
Heated seat ....................................................... SE-82
Heater and cooling unit (Heater core) . ATC-157, ATC-
160
Heater unit (heater core) ............... ATC-157, ATC-160
Height (Dimensions) ........................................... GI-51
HFC134a (R134a) system identification ........... ATC-6
HFC134a (R134a) system precaution ............... ATC-5
HFC134a (R134a) system service procedure ATC-175
HFC134a (R134a) system service tools ......... ATC-14
HFC134a system service equipment precaution ATC-
11
High and low reverse clutch solenoid valve .... AT-147,
AT-149
Homelink universal transceiver ........................ BL-146
Horn ................................................................ WW-48
HORN - Wiring diagram .................................. WW-48
How to erase DTC for OBD system .................. EC-63
HSEAT - Wiring diagram ................................... SE-84
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IATS - Wiring diagram ..................................... EC-215
ICC - Wiring diagram ....................................... ACS-20
ICC/BS - Wiring diagram ................................. EC-565
ICC/SW - Wiring diagram ................................ EC-550
ICCBOF - Wiring diagram ............................... EC-672
Identification plate .............................................. GI-49
Idle air volume learning ..................................... EC-80
Idle speed .............................................. EC-73, EC-78
Idle speed control (ISC) .................... EC-466, EC-468
Ignition coil .......................................... EM-28, EC-679
Ignition control system .................................... EC-679
Ignition key hole illumination ............................ LT-110
Ignition timing ........................................ EC-73, EC-78
IGNSYS - Wiring diagram ............................... EC-680
ILL - Wiring diagram ......................................... LT-136
Illumination ....................................................... LT-130
In vehicle sensor ........................... ATC-141, ATC-150
In-cabin Microfilter ............................................. MA-21
INJECT - Wiring diagram ................................. EC-660
Injector ............................................................. EC-659
Input clutch solenoid valve ................. AT-135, AT-137
Instrument panel .................................................. IP-10
Intake air temperature sensor ............ EC-214, EC-234
Intake door control linkage adjustment . ATC-85, ATC-
88
Intake door motor ........................... ATC-83, ATC-164
Intake manifold .................................................. EM-17
Intake sensor ................................ ATC-146, ATC-152
Intake valve timing control (Bank 1) ................ EC-161
Intake valve timing control (Bank 2) ................ EC-161
Intake valve timing control position sensor (Bank 1) ....
EC-492
Intake valve timing control position sensor (Bank 2) ....
EC-492
Intake valve timing control solenoid valve (Bank 1) EC-
189
Intake valve timing control solenoid valve (Bank 2) EC-
189
Integrated homelink transmitter - See Homelink univer-
sal tranceiver .................................................... BL-146
Intelligent cruise control (ICC) system ............... ACS-6
Interior ................................................................. EI-35
Interior lamp ...................................................... LT-110
Interior lamp on-off control ................................ LT-111
Internal gear (Transfer) ....................... TF-149, TF-176
IPDM (Intelligent power distribution module engine
room) ................................................................. PG-18
IVCB1 - Wiring diagram ................................... EC-190
IVCB2 - Wiring diagram ................................... EC-192
IVCSB1 - Wiring diagram ................................ EC-493
IVCSB2 - Wiring diagram ................................ EC-495
IVIS (Infiniti vehicle immobilizer system) .......... BL-127
IVIS (Infiniti vehicle immobilizer system) precautions ...
GI-3
IVTB1 - Wiring diagram ................................... EC-164
IVTB2 - Wiring diagram ................................... EC-166
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Jacking points ..................................................... GI-42
Junction box (J/B) .............................................. PG-76
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Key illumination ................................................ LT-111
KEYLES - Wiring diagram .................................. BL-45
Knock sensor (KS) ........................................... EC-357
KS - Wiring diagram ........................................ EC-358
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Laser beam aiming adjustment ....................... ACS-12
Length (Dimensions) .......................................... GI-51
License lamp ...................................................... LT-89
Lifting points ....................................................... GI-43

IDX-6
ALPHABETICAL INDEX
Line pressure solenoid valve ........................... AT-118
Line pressure switch (Transfer) .......... TF-154, TF-167
Line pressure test (A/T) ..................................... AT-52
Location of electrical units ................................. PG-65
Low coast brake solenoid valve ......... AT-151, AT-153
Low tire pressure warning system ...................... WT-8
Low tire pressure warning system - trouble diagnoses .
WT-11
Low tire pressure warning system - Wiring diagram .....
WT-11
Lubricant (R134a) A/C ..................................... ATC-22
Lubricants ......................................................... MA-11
Lubrication circuit (engine) ................................... LU-6
Lubrication oil A/C ............................................ ATC-22
Lubrication-locks, hinges and hood latches ...... MA-31
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MAFS - Wiring diagram ..................... EC-200
, EC-208
Magnet clutch ............................... ATC-115, ATC-180
MAIN - Wiring diagram ...................... EC-150, AT-163
Main oil pump (Transfer) ..................... TF-154, TF-167
Mainshaft (Transfer) ........................... TF-154, TF-167
Maintenance (engine)Schedule 1 ....................... MA-7
Maintenance (engine)Schedule 2 ....................... MA-9
Major overhaul (Final drive) ............................. FFD-14
Major overhaul (Transfer) ................................ TF-146
Malfunction indicator lamp (MIL) ........................ EC-65
Map lamp .......................................................... LT-111
Mass air flow sensor (MAFS) ............. EC-197, EC-206
Meter ..................................................................... DI-5
METER - Wiring diagram ...................................... DI-9
MIL data link connectors circuit ....................... EC-697
MIL/DL - Wiring diagram .................................. EC-697
MIRROR - Wiring diagram ................................ GW-87
Misfire .............................................................. EC-350
Mode door control linkage adjustment ............. ATC-65
Mode door motor ............................ ATC-62, ATC-165
Model variation ................................................... GI-48
Multiport fuel injection (MFI) system .................. EC-25
Multiport fuel injection precautions ....................... GI-6
Multi-remote control system - See Remote keyless entry
system ............................................................... BL-40
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NATS - Wiring diagram .................................... BL-130
NAVI - Wiring diagram ....................................... AV-86
NAVI Control Unit .............................................. AV-83
Navigation system ............................................. AV-81
Neutral-4LO switch ............................................ TF-61
NONDTC - Wiring diagram .............................. AT-172
NVH troubleshooting (AX) ................................. FAX-4
NVH troubleshooting (EM) ................................ EM-10
NVH troubleshooting (Final drive) ..................... RFD-7
NVH troubleshooting (Propeller shaft) ................. PR-3
NVH troubleshooting (RAX) .............................. RAX-4
NVH troubleshooting (RSU) .............................. RSU-5
NVH troubleshooting (ST) .................................... PS-5
NVH troubleshooting (Transfer) ......................... TF-10
NVH troubleshooting (WT)NVH troubleshooting (WT) ..
WT-4
NVIS (Nissan vehicle immobilizer system) precautions
GI-3
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O2H2B1 - Wiring diagram ............................... EC-183
O2H2B2 - Wiring diagram ............................... EC-185
O2S2B1 - Wiring diagram ... EC-279, EC-290, EC-303
O2S2B2 - Wiring diagram ... EC-281, EC-292, EC-305
Oil cooler (engine) .............................................. LU-12
Oil filter ............................................................... LU-11
Oil filter (Transfer) ............................................ TF-143
Oil pan (engine) ................................................ EM-24
Oil pressure (engine) ........................................... LU-8
Oil pressure relief valve (engine) ......................... LU-6
Oil pump (engine) .............................................. LU-14
Oil seal replacement (engine) ........................... EM-60
Oil seal replacement (front of final drive) FFD-8, RFD-9
Oil seal replacement (side of final drive) ......... RFD-11
On board diagnostic system ............................. EC-49
ORVR (On-board Refueling Vapor Recovery) .. EC-40
Overheat ......................................................... EC-504
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P/SCKT - Wiring diagram ................................. WW-46
Pantograph jack .................................................. GI-42
Park/Neutral position switch ............................ EC-487
Parking brake control ........................................... PB-4
PCV (positive crankcase ventilation) ................ EC-46
Periodic maintenance ......................................... MA-7
Personal lamp .................................................. LT-111
PGC/V - Wiring diagram ................... EC-397, EC-405
PHASE - Wiring diagram ................................ EC-371
PHONE - Wiring diagram ................................... AV-65
Pinion bearing preload diff. ............................. RFD-26
Piston pin inspection ......................................... EM-94
Piston ring inspection ........................................ EM-95
Piston to bore clearance ................................... EM-99
Planetary carrier (Transfer) ................. TF-149, TF-176
PNP/SW - Wiring diagram ... EC-489, AT-101, AT-102
POS - Wiring diagram ..................................... EC-364
POWER - Wiring diagram ................................... PG-6
Power door lock ................................................. BL-16
Power seat ......................................................... SE-81
Power steering fluid level .................................. MA-29
Power steering gear ........................................... PS-15
Power steering oil pump .................................... PS-22
Power steering pressure (PSP) sensor ........... EC-470
Power steering system bleeding .......................... PS-6
Power supply routing .......................................... PG-4
Power window .................................................. GW-15
PRE/SE - Wiring diagram ................. EC-429, EC-435
Precautions (General) ........................................... GI-4
Precautions in repairing high strength steel ..... BL-182
Pressure switch 1 ............................... AT-141, AT-155

LAN-1
ELECTRICAL
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SECTION LAN
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CONTENTS
LAN SYSTEM
CAN FUNDAMENTAL
SERVICE INFORMATION ............................
3
PRECAUTIONS ...................................................3
Precaution When Using CONSULT-II .......................3
Precaution for Trouble Diagnosis ..............................3
Precaution for Harness Repair ..................................3
SYSTEM DESCRIPTION .....................................4
CAN Communication System ....................................4
Diag on CAN .............................................................5
TROUBLE DIAGNOSIS ......................................7
Condition of Error Detection ......................................7
Symptom When Error Occurs in CAN Communi-
cation System ............................................................
7
Self-Diagnosis .........................................................10
CAN Diagnostic Support Monitor ............................10
TROUBLE DIAGNOSES WORK FLOW ............13
Information Needed for Trouble Diagnosis .............13
How to Use CAN Communication Signal Chart ......13
Trouble Diagnosis Flow Chart .................................14
Trouble Diagnosis Procedure ..................................14
CAN
SERVICE INFORMATION ...........................
36
INDEX FOR DTC ................................................36
DTC No. Index ........................................................36
HOW TO USE THIS SECTION ...........................37
Caution ....................................................................37
Abbreviation List ......................................................37
PRECAUTIONS ..................................................38
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
38
Precaution When Using CONSULT-II .....................38
Precaution for Trouble Diagnosis ............................38
Precaution for Harness Repair ................................38
TROUBLE DIAGNOSIS ....................................40
CAN Diagnostic Support Monitor .............................40
CAN System Specification Chart .............................44
CAN Communication Signal Chart ..........................44
Schematic ................................................................49
Wiring Diagram - CAN - ...........................................50
Interview Sheet ........................................................53
Data Sheet ...............................................................54
CAN System (Type 1) ..............................................57
CAN System (Type 2) ..............................................58
CAN System (Type 3) ..............................................59
CAN System (Type 4) ..............................................60
Component Parts Location ......................................61
Harness Layout .......................................................61
Malfunction Area Chart ............................................61
Main Line Between TCM and Driver Seat Control
Unit ..........................................................................
62
Main Line Between TCM and ICC Sensor ...............63
Main Line Between ICC Sensor and ICC Unit .........64
Main Line Between ICC Unit and Driver Seat Con-
trol Unit ....................................................................
65
Main Line Between Driver Seat Control Unit and
Data Link Connector ................................................
65
Main Line Between Data Link Connector and ABS
Actuator and Electric Unit (Control Unit) ..................
66
ECM Branch Line Circuit .........................................67
TCM Branch Line Circuit .........................................67
ICC Sensor Branch Line Circuit ...............................68
ICC Unit Branch Line Circuit ....................................69
Driver Seat Control Unit Branch Line Circuit ...........69
BCM Branch Line Circuit .........................................70
Display Control Unit Branch Line Circuit .................70
Data Link Connector Branch Line Circuit ................71
Front Air Control Branch Line Circuit .......................71
Combination Meter Branch Line Circuit ...................72
Steering Angle Sensor Branch Line Circuit .............72
Transfer Control Unit Branch Line Circuit ................73
ABS Actuator and Electric Unit (Control Unit)
Branch Line Circuit ..................................................
74

TROUBLE DIAGNOSIS
LAN-7
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Condition of Error DetectionINFOID:0000000003533611
“U1000” or “U1001” is indicated on SELF-DIAG RESULTS on CONSULT-II if 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 INDICATED “U1000” OR “U1001” IS INDICATED EVEN THOUGH CAN COMMUNICATION
SYSTEM IS NORMAL
• CONSULT-II CONVERTER not connected: Error may be detected by the self-diagnosis when not using
CONSULT-II CONVERTER (Depending on the control unit which carries out CAN communication).
• 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 “U1000” or “U1001” is indicated on SELF-DIAG RESULTS of CON-
SULT-II under the above conditions. Erase the memory of the self-diagnosis of each unit.
Symptom When Error Occurs in CAN Communication SystemINFOID:0000000003533612
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
• Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
• Refer to LAN-37, "
Abbreviation List" for the unit abbreviation.
Example: TCM branch line open circuit
SKIB8738E

LAN-10
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Self-Diagnosis
INFOID:0000000003533613
CAN Diagnostic Support MonitorINFOID:0000000003533614
CONSULT-II and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.
MONITOR ITEM (CONSULT-II)
Unit name Symptom
ECM• Engine torque limiting is affected, and shift harshness increases.
• Engine speed drops.
BCM• Reverse warning chime 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 is OFF.)
• The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch is 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/RWhen the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
DTCSelf-diagnosis item
(CONSULT-II indication)DTC detection condition Inspection/Action
U1000 CAN COMM CIRCUITWhen ECM is not transmitting or receiving CAN
communication signal of OBD (emission-related
diagnosis) for 2 seconds or more.
Refer to LAN-13
. When a control unit (except for ECM) is not
transmitting or receiving CAN communication
signal for 2 seconds or more.
U1001 CAN COMM CIRCUITWhen ECM is not transmitting or receiving CAN
communication signal other than OBD (emis-
sion-related diagnosis) for 2 seconds or more.
U1002 SYSTEM COMMWhen a control unit is not transmitting or receiv-
ing CAN communication signal for 2 seconds or
less.Start the inspection. Re-
fer to the applicable sec-
tion of the indicated
control unit.
U1010 CONTROL UNIT [CAN]When an error is detected during the initial diag-
nosis for CAN controller of each control unit.Replace the control unit
indicating “U1010”.