2007 NISSAN 350Z ECU

TROUBLE DIAGNOSIS
LAN-9
[CAN FUNDAMENTAL]
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LAN
Revision: 2006 November2007 350Z
Example: Data link connector branch line open circuit
NOTE:

When data link connector branch line is open, transmission and reception of CAN communication signals
is not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.

When data link connector branch line is open, “ECU list” displayed on the CONSULT-III “CAN DIAG SUP-
PORT MNTR” may be the same as when the CAN communication line has short-circuit. However, symp-
toms differ depending on the case. See below chart for the differences.
SKIB8739E
Unit name Symptom
ECM
Normal operation. BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
“ECU list” on the “CAN DIAG
SUPPORT MNTR”
(CONSULT-III)Difference of symptom
Data link connector branch line open cir-
cuit
All Diag on CAN units are not
indicated.Normal operation.
CAN-H, CAN-L harness short-circuitMost the units which are connected to the CAN com-
munication system enter fail-safe mode or are deac-
tivated.

TROUBLE DIAGNOSES WORK FLOW
LAN-15
[CAN FUNDAMENTAL]
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LAN
Revision: 2006 November2007 350Z
TROUBLE DIAGNOSES WORK FLOWPFP:00004
Information Needed for Trouble DiagnosisNKS004PI
CAN communication system performs trouble diagnosis with the following tools.
How to Use CAN Communication Signal ChartNKS004PJ
The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.
Tool Usage
Interview sheet For filling in vehicle information and interview with customer.
Data sheet For copying on-board diagnosis data.
Diagnosis sheetFor detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system
type)
ECU list
(On the “CAN DIAG SUP-
PORT MNTR”)
For checking the condition of control units and the status of CAN communication. SELF-DIAG RESULTS
(CONSULT-III)
CAN DIAG SUPPORT MNTR
(CONSULT-III)
CAN communication signal
chartFor converting information received from a customer into CAN communication signal transmission
and reception. This information can be used to judge whether a circuit between control units is nor-
mal or abnormal.
Abbreviation list For checking abbreviations in CAN communication signal chart and diagnosis sheet.
SKIB8715E

LAN-22
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2006 November2007 350Z
COLLECT DATA
Collect CONSULT-III Data
Print out or save the following CONSULT-III data.

SELF-DIAG RESULTS

CAN DIAG SUPPORT MNTR (“ECU list” included)
NOTE:
Some items may not be needed depending on CAN system type of vehicle.
PKID1212E

LAN-24
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2006 November2007 350Z
CREATE DIAGNOSIS SHEET
NOTE:
Be sure to use the diagnosis sheet for the correct CAN system type.
Print Diagnosis Sheet
Print the diagnosis sheet for the applicable CAN system type.
Check Collected Data
Make sure that all ECUs are received, referring to “ECU list”.

For abbreviations, refer to LAN-41, "Abbreviation List" .
PKID1213E

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

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

HOW TO USE THIS SECTION
LAN-41
[CAN]
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LAN
Revision: 2006 November2007 350Z
HOW TO USE THIS SECTIONPFP:00008
CautionNKS004PN

This section describes information peculiar to a vehicle, sheets for trouble diagnosis, and inspection pro-
cedures.

For trouble diagnosis procedure, refer to LAN-17, "Trouble Diagnosis Procedure" .
Abbreviation ListNKS004PO
Abbreviations in CAN communication signal chart, and the diagnosis sheet are as per the following list.
Abbreviation Unit nameSELECT SYSTEM
(CONSULT-III)CAN DIAG SUPPORT MNTR
(CONSULT-III)
A-BAG Air bag diagnosis sensor unit AIR BAG —
ABSABS actuator and electric unit (control unit)
ABS VDC/TCS/ABS
VDC/TCS/ABS control unit
BCM BCM BCM BCM/SEC
DLC Data link connector — —
ECM ECM ENGINE ECM
IPDM-E IPDM E/R IPDM E/R IPDM E/R
M&A Unified meter and A/C amp. METER/M&A METER/M&A
STRG Steering angle sensor — STRG
TCM TCM A/T TCM

LAN-66
[CAN]
TROUBLE DIAGNOSIS
Revision: 2006 November2007 350Z
Main Line Between VDC/TCS/ABS Control Unit and Data Link ConnectorNKS0054K
INSPECTION PROCEDURE
1. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the following harness connectors.
–ECM harness connector
–Harness connectors B101 and M73
4. Check the continuity between the Harness connector M73 and the data link connector.
OK or NG
OK >>
Present error: Check the following items again.
–Decision of CAN system type.
–Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU
list” included)].
–Procedure for detecting root cause.

Past error: Error was detected in the main line between the VDC/TCS/ABS control unit and the
data link connector.
NG >> Repair the main line between the harness connector M73 and the data link connector.
Main Line Between TCM and Data Link ConnectorNKS0054L
INSPECTION PROCEDURE
1. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Disconnect the following harness connectors.
–ECM harness connector
–Harness connectors F102 and M72
4. Check the continuity between the Harness connector M72 and the data link connector.
OK or NG
OK >>
Present error: Check the following items again.
–Decision of CAN system type.
–Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU
list” included)].
–Procedure for detecting root cause.

Past error: Error was detected in the main line between the TCM and the data link connector.
NG >> Repair the main line between the harness connector M72 and the data link connector.
Harness connector Data link connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
M734M
M86Yes
5M 14 Yes
Harness connector Data link connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
M7225H
M86Yes
24H 14 Yes