2008 INFINITI QX56 Factory Service Manual

Page 2497 of 4083

INFINITI QX56 2008  Factory Service Manual LAN-2
MAIN LINE BETWEEN TCM AND LASER 
CIRCUIT .............................................................
63
Diagnosis Procedure  ........................................... ...63
MAIN LINE BETWEEN

Page 2498 of 4083

INFINITI QX56 2008  Factory Service Manual LAN
PRECAUTIONSLAN-3
< PRECAUTION > [CAN FUNDAMENTAL]
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PRECAUTION
PRECAUTIONS
Precaution for Trouble DiagnosisINFOID:0000000001374959
CAUTION:
• Never apply 7.0 V or mor

Page 2499 of 4083

INFINITI QX56 2008  Factory Service Manual LAN-4
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
CAN COMMUNICATION SYSTEM
FUNCTION DIAGNOSIS
CAN COMMUNICATION SYSTEM
System DescriptionINFOID:0000000001374961
• CAN communication is a multiplex commun

Page 2500 of 4083

INFINITI QX56 2008  Factory Service Manual LAN
CAN COMMUNICATION SYSTEMLAN-5
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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CAN Communication Control CircuitINFOID:0000000001374963
*: These are the only control units wi

Page 2501 of 4083

INFINITI QX56 2008  Factory Service Manual LAN-6
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
DIAG ON CAN
DIAG ON CAN
DescriptionINFOID:0000000001374964
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 comm

Page 2502 of 4083

INFINITI QX56 2008  Factory Service Manual LAN
TROUBLE DIAGNOSISLAN-7
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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TROUBLE DIAGNOSIS
Condition of Error DetectionINFOID:0000000001374966
“U1000” or “U1001” is in

Page 2503 of 4083

INFINITI QX56 2008  Factory Service Manual LAN-8
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: Data link connector branch line open circuit
NOTE:
• When data link connector branch line is open, transmission and reception

Page 2504 of 4083

INFINITI QX56 2008  Factory Service Manual LAN
TROUBLE DIAGNOSISLAN-9
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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Example: Main Line Between Data Link Connector and ABS Actuator and Electr
ic Unit (Control Unit) Open