Infiniti QX56 (JA60). Manual - part 657

 

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Infiniti QX56 (JA60). Manual - part 657

 

 

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-27

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

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5. Perform the inspection for the detected error circuit. For the inspection procedure, refer to “MALFUNC-

TION AREA CHART”. 

Present Error — Short Circuit —

When the symptoms listed below exist, a short circuit of the CAN communication line is a possible cause.

Received data

Error symptom

• Most the units connected to the CAN communication system go into fail-safe mode or are deactivated.

Inspection procedure

PKID1219E

Item (CONSULT-III)

Indication

ECU list (on the CAN DIAG SUPPORT MNTR)

All Diag on CAN units are not indicated.

CAN DIAG SUPPORT MNTR

“UNKWN” is indicated under “TRANSMIT DIAG” and most reception items.

LAN-28

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

• Refer to “MALFUNCTION AREA CHART”.

Past Error — Open Circuit —

Review CAN communication signal chart based on information received from the interview with the customer

and on past error information from SELF-DIAG RESULTS and CAN DIAG SUPPORT MNTR.

PKID1220E

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-29

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

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1. SELF-DIAG RESULTS: Inspect the control units indicating “U1000” or “U1001” on SELF-DIAG RESULTS.

2. CAN DIAG SUPPORT MNTR (with PAST): Check the CAN DIAG SUPPORT MNTR (with PAST) of units

indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indicate

the possible error circuit.

NOTE:

For the details of each indication on CAN DIAG SUPPORT MNTR, refer to 

LAN-47, "CAN Diagnostic Sup-

port Monitor"

.

a. Reception item of “ECM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means ECM could not

receive the signal from ABS in the past. Draw a line between ECM and ABS (line 2-a in the figure below).

b. Reception item of “M&A”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means M&A could not

receive the signal from ABS in the past. Draw a line between M&A and ABS (line 2-b in the figure below).

PKID1221E

LAN-30

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

c.

Reception item of “TCM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means TCM could not

receive the signal from ABS in the past. Draw a line between TCM and ABS (line 2-c in the figure below).

3. CAN DIAG SUPPORT MNTR (without PAST): Check the CAN DIAG SUPPORT MNTR (without PAST) of

units indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indi-

cate the possible error circuit.

NOTE:

• While an error occurred in the past according to SELF-DIAG RESULTS, it is unclear which signal is not

received. Assume that errors were detected from all reception items.

• Draw a single line among the unit and all reception items. (Work flow differs from CAN DIAG SUPPORT

MNTR (with PAST).)

a. Reception item of “EPS”: Assume that the unit could not receive the signals from ECM, ABS, and M&A.

Draw a line among EPS, ECM, ABS, and M&A (line 3-a in the figure below).

PKID1222E

 

 

 

 

 

 

 

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