2010 INFINITI QX56 Factory Service Manual

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Page 2601 of 4210

INFINITI QX56 2010 Factory Service Manual LAN
PRECAUTIONSLAN-3
< PRECAUTION > [CAN FUNDAMENTAL]
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PRECAUTION
PRECAUTIONS
Precaution for Trouble DiagnosisINFOID:0000000005146437
CAUTION:
• Never apply 7.0 V or mor

Page 2602 of 4210

INFINITI QX56 2010 Factory Service Manual LAN-4
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
CAN COMMUNICATION SYSTEM
FUNCTION DIAGNOSIS
CAN COMMUNICATION SYSTEM
System DescriptionINFOID:0000000005146439
• CAN communication is a multiplex commun

Page 2603 of 4210

INFINITI QX56 2010 Factory Service Manual LAN
CAN COMMUNICATION SYSTEMLAN-5
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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CAN Communication Control CircuitINFOID:0000000005146441
*: These are the only control units wi

Page 2604 of 4210

INFINITI QX56 2010 Factory Service Manual LAN-6
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
DIAG ON CAN
DIAG ON CAN
DescriptionINFOID:0000000005146442
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 comm

Page 2605 of 4210

INFINITI QX56 2010 Factory Service Manual LAN
TROUBLE DIAGNOSISLAN-7
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Condition of Error DetectionINFOID:0000000005152906
DTC of CAN communication is indi

LAN
TROUBLE DIAGNOSISLAN-7
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Condition of Error DetectionINFOID:0000000005152906
DTC of CAN communication is indicated on SELF-DIA
G RESULTS on CONSULT-III if a CAN communication
signal is not transmitted or received between units for 2 seconds or more.
NOTE:
DTCs of CAN communication are follows:
• U0101
• U0140
• U0164
• U1000
• U1001
CAN COMMUNICATION SYSTEM ERROR
• CAN communication line open (CAN-H, CAN-L, or both)
• CAN communication line short (ground, betw een 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 detec ted 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.
CAUTION:
CAN communication system is normal if DTC of CAN communication is indicated on SELF-DIAG
RESULTS of CONSULT-III under th e above conditions. Erase the memory of the self-diagnosis of each
unit.
Symptom When Error Occurs in CAN Communication SystemINFOID:0000000005146445
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communicati on 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-36, "
Abbreviation List" for the unit abbreviation.
Revision: April 20092010 QX56

Page 2606 of 4210

INFINITI QX56 2010 Factory Service Manual LAN-8
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: TCM branch line open circuit
Example: Data link connector branch line open circuit
SKIB8738E
Unit name
Symptom
ECM Engine torqu

Page 2607 of 4210

INFINITI QX56 2010 Factory Service Manual LAN
TROUBLE DIAGNOSISLAN-9
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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NOTE:
• When data link connector branch line is open, transmi
ssion and reception of CAN communicati

Page 2608 of 4210

INFINITI QX56 2010 Factory Service Manual LAN-10
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: CAN-H, CAN-L Harness Short Circuit
TCM
No impact on operation.
IPDM E/R When the ignition switch is ON,
• The headlamps (Lo)

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