Infiniti QX56 (Z62). Manual - part 858

 

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Infiniti QX56 (Z62). Manual - part 858

 

 

LAN

SYSTEM

LAN-9

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

CAN COMMUNICATION SYSTEM : CAN Communication Control Circuit

INFOID:0000000006220514

*: These are the only control units wired with both ends of CAN communication system.

DIAG ON CAN

DIAG ON CAN : Description

INFOID:0000000006220515

“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
lines, between control units and diagnosis unit.

SKIB8713E

Component

System description

CAN controller

It controls CAN communication signal transmission and reception, error detection, etc.

Transceiver IC

It converts digital signal into CAN communication signal, and CAN communication signal into digital 
signal.

Noise filter

It eliminates noise of CAN communication signal.

Termination circuit

*

(Resistance of approx. 120 

)

It produces potential difference.

LAN-10

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

SYSTEM

DIAG ON CAN : System Diagram

INFOID:0000000006220516

SKIB8714E

Name

Harness

Description

DDL1

Tx
Rx

It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)

DDL2

K-LINE

It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)

Diag on CAN

CAN-H
CAN-L

It is used for trouble diagnosis and control.

LAN

TROUBLE DIAGNOSIS

LAN-11

< SYSTEM DESCRIPTION >

[CAN FUNDAMENTAL]

C

D

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F

G

H

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TROUBLE DIAGNOSIS

Condition of Error Detection

INFOID:0000000006220517

DTC of CAN communication is indicated on SELF-DIAG 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 as follows:
• U0101
• U0140
• U0164
• U1000
• U1001
• U1507
• U1508

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.

CAUTION:

CAN communication system is normal if DTC of CAN communication is indicated on SELF-DIAG
RESULTS of CONSULT-III under the above conditions. Erase the memory of the self-diagnosis of each
unit.

Symptom When Error Occurs in CAN Communication System

INFOID:0000000006220518

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-23, "Abbreviation List"

 for the unit abbreviation.

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

Normal 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

 

 

 

 

 

 

 

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