Nissan Frontier. Manual — part 968

LAN-22

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

Identify the error circuit using information from the “CAN DIAG SUPPORT MNTR”
1. Check the items indicated in “ALL DTC”. Draw a line on the diagnosis sheet to indicate the error circuit.

NOTE:

CAN communication line has no error if units other than Diag on CAN units are not indicated. An error

may be on the power supply of the control unit, DDL1 line or DDL2 line.

a. “TCM” which is Diag on CAN unit, is not indicated on “ALL DTC.” This indicates that DLC is not receiving

a signal from TCM. Draw a line to indicate an error between DLC and TCM (line 1-a in the figure below).

NOTE:

• Diag on CAN units are not indicated on the “ALL DTC” when the CAN line between Diag on CAN unit

and the data link connector is open.

• For a description of Diag on CAN, refer to

LAN-6, "Description"

.

2. CAN DIAG SUPPORT MNTR: Check each item on “CAN DIAG SUPPORT MNTR”. Draw a line on the

diagnosis sheet to indicate the error circuit.

a. Reception item of “ENGINE”: On “TCM”, “UNKWN” is indicated. This means ECM cannot receive the sig-

nal from TCM. Draw a line to indicate an error between ECM and TCM (line 2-a in the figure below).

NOTE:

If “UNKWN” is indicated on “TRANSMIT DIAG”, then the control unit cannot transmit CAN communication

signal to each unit. Draw a line between the control unit and the splice.

b. Reception item of “ADAPTIVE LIGHT”: On “TCM”, “UNKWN” is indicated. This means AFS cannot

receive the signal from TCM. Draw a line to indicate an error between AFS and TCM (line 2-b in the figure

below).

JSMIA0813GB

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-23

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

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K

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B

A

O

P

N

c. Reception item of “MULTI AV”: “UNKWN” is not indicated. This indicates normal communication between

AV and its receiving units. Do not draw any line.

d. Reception item of “BCM”: On “TCM”, “UNKWN” is indicated. This means BCM cannot receive the signal

from TCM. Draw a line to indicate an error between BCM and TCM (line 2-d in the figure below).

e. Reception item of “EPS” and “INTELLIGENT KEY”: “UNKWN” is not indicated. This indicates normal com-

munication between EPS and I-KEY and their receiving units. Do not draw any line.

NOTE:

JSMIA0814GB

LAN-24

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

On CAN DIAG SUPPORT MNTR (without PAST), “UNKWN” is indicated even though the item is not used

in the trouble diagnosis. For the details of each item on CAN diagnostic support monitor, refer to

LAN-56,

"CAN Diagnostic Support Monitor"

.

f.

Reception item of “METER/M&A”: On “TCM”, “UNKWN” is indicated. This means M&A cannot receive the

signal from TCM. Draw a line to indicate an error between M&A and TCM (line 2-f in the figure below).

g. Reception item of “AUTO DRIVE POS.”: On “TCM”, “UNKWN” is indicated. This means ADP cannot

receive the signal from TCM. Draw a line to indicate an error between ADP and TCM (line 2-g in the figure

below).

JSMIA0815GB

LAN

DIAGNOSIS AND REPAIR WORKFLOW

LAN-25

< BASIC INSPECTION >

[CAN FUNDAMENTAL]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

h. Reception item of “ABS”: “UNKWN” is not indicated. This indicates normal communication between ABS

and its receiving units. Do not draw any line.

i.

Reception item of “IPDM E/R”: “UNKWN” is not indicated. This indicates normal communication between

IPDM-E and its receiving units. Do not draw any line.

3. Based on information received from “CAN DIAG SUPPORT MNTR”, place a check mark on the known

good CAN communication line between ECM and IPDM-E.

a. Through the previous procedure, the circuit between ADP splice and TCM has the most amount of lines

(shade 3-a in the figure below).

b. Place a check mark on the known good lines to establish the error circuit.

JSMIA0816GB