Infiniti QX56 (JA60). Manual - part 658

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-31

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

b. Reception item of “ABS”: Assume that the unit could not receive the signal from ECM. Draw a line

between ABS and ECM (line 3-b in the figure below).

4. Search for the possible cause using CAN communication signal chart using information from the interview

with the customer.

NOTE:

For the details of CAN communication signal, refer to 

LAN-44, "CAN Communication Signal Chart"

.

a. ABS warning lamp turned ON and speedometer did not move: This means that “ABS warning lamp signal”

and “Vehicle speed signal” could not communicate between M&A and ABS (4-a in the figure below).

PKID1223E

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[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

b. The tachometer moved normally: This means that “Engine speed signal” could communicate normally

between ECM and M&A (4-b in the figure below).

5. Fill out the diagnosis sheet based on information from step 4.
a. The ABS warning lamp turned ON and speedometer did not move: Assume that a possible cause is no

communication between M&A and ABS. Draw a line between M&A and ABS. (Line 5-a in the figure

below).

SKIB8895E

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-33

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

b. The tachometer moved normally: Put check marks between ECM and M&A. The circuit between ECM and

M&A is functioning properly (check marks 5-b in the figure below).

6. The circuit which has the most amount of lines are the possible cause. Error is detected from ABS actua-

tor and electric unit (control unit) branch line (shaded in the figure below).

NOTE:

For abbreviations, refer to 

LAN-36, "Abbreviation List"

.

SKIB8735E

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[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

7. Perform the inspection procedure for the possible cause. Refer to “MALFUNCTION AREA CHART”.

Past Error — Short Circuit —

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

PKID1224E

Item (CONSULT-III)

Indication

Inspection procedure

SELF-DIAG RESULTS

 “U1000” and “U1001” is indicated in the past for most units.

Refer to “MALFUNCTION AREA 
CHART”.

CAN DIAG SUPPORT MNTR

Only on CAN DIAG SUPPORT MNTR (with PAST), “1 - 39” is in-
dicated on “PAST” of “TRANSMIT DIAG” and the reception item.