2007 NISSAN 350Z LAN System Workshop Manual

TROUBLE DIAGNOSES WORK FLOW
LAN-25
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Revision: 2006 November2007 350Z
DETECT THE ROOT CAUSE
Identify the root cause using the created diagnosis sheet.
Identifying the root cause

Draw a line on the diagnosis sheet to indicate the possible cause. Narrow the search.
NOTE:

Color-code when drawing lines.

Do not draw a line onto a existing line.

Drawing a line is not necessary if the circuit is shorted. Refer to LAN-32, "Present Error — Short Circuit —
" , LAN-39, "Past Error — Short Circuit —" .
Refer to the following for details of the trouble diagnosis procedure.

LAN-26, "Present Error — Open Circuit —"

LAN-32, "Present Error — Short Circuit —"

LAN-33, "Past Error — Open Circuit —"

LAN-39, "Past Error — Short Circuit —"
NOTE:
When the root cause appears to be a branch line or short circuit, be sure to check the control unit as well as
the communication line.

LAN-26
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2006 November2007 350Z
Present Error — Open Circuit —
Identify the error circuit using information from the “CAN DIAG SUPPORT MNTR” (“ECU list” included).
1. ECU list: Check the items indicated in “ECU list”. 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 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 “ECU list”. 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).
NOTE:

Diag on CAN units are not indicated on the “ECU list” 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, "Diag on CAN" .
PKID1214E

TROUBLE DIAGNOSES WORK FLOW
LAN-27
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Revision: 2006 November2007 350Z
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 “ECM”: On “TCM”, “UNKWN” is indicated. This means ECM cannot receive the signal
from TCM. Draw a line to indicate an error between ECM and TCM (line 2-a in the figure).
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 “AFS”: 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).
c. Reception item of “AV”: “UNKWN” is not indicated. This indicates normal communication between AV and
its receiving units. Do not draw any line.
PKID1215E

LAN-28
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2006 November2007 350Z
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).
e. Reception item of “EPS” and “I-KEY”: “UNKWN” is not indicated. This indicates normal communication
between EPS and I-KEY and their receiving units. Do not draw any line.
NOTE:
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-44,
"CAN Diagnostic Support Monitor" .
PKID1216E

TROUBLE DIAGNOSES WORK FLOW
LAN-29
[CAN FUNDAMENTAL]
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Revision: 2006 November2007 350Z
f. Reception item of “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).
g. Reception item of “ADP”: 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).
h. Reception item of “ABS”: “UNKWN” is not indicated. This indicates normal communication between ABS
and its receiving units. Do not draw any line.
PKID1217E

LAN-30
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2006 November2007 350Z
i. Reception item of “IPDM-E”: “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).
b. Place a check mark on the known good lines to establish the error circuit.
Reception item of “IPDM-E”: On “ECM”, “OK” is indicated. IPDM-E communicates normally with ECM. Put
a check mark on the normal circuit between ECM and IPDM-E (check mark 3-b in the figure).
PKID1218E

TROUBLE DIAGNOSES WORK FLOW
LAN-31
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LAN
Revision: 2006 November2007 350Z
4. Through the above procedure, the error is detected in the TCM branch line (shaded in the figure).
NOTE:
For abbreviations, refer to LAN-41, "
Abbreviation List" .
5. Perform the inspection for the detected error circuit. For the inspection procedure, refer to LAN-65, "
Mal-
function Area Chart" .
PKID1219E

LAN-32
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2006 November2007 350Z
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

Refer to LAN-65, "Malfunction Area Chart" .
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.
PKID1220E