Infiniti M35/M45 Y50. Manual — part 844
TROUBLE DIAGNOSES WORK FLOW
LAN-25
[CAN FUNDAMENTAL]
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DETECT THE ROOT CAUSE
Identify the root cause using the created diagnosis sheet.
Identifying the root cause
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Draw a line on the diagnosis sheet to indicate the possible cause. Narrow the search.
NOTE:
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Color-code when drawing lines.
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Do not draw a line onto a existing line.
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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 —"
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Refer to the following for details of the trouble diagnosis procedure.
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LAN-26, "Present Error — Open Circuit —"
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LAN-32, "Present Error — Short Circuit —"
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LAN-33, "Past Error — Open Circuit —"
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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
Present Error — Open Circuit —
Identify the error circuit using information from the “SELECT SYSTEM” and “CAN DIAG SUPPORT MNTR”
screens.
1.
SELECT SYSTEM: Check the items indicated in “SELECT SYSTEM”. 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.
“TRANSMISSION” which is Diag on CAN unit, is not indicated on “SELECT SYSTEM” screen. This indi-
cates 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:
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Diag on CAN units are not indicated on the “SELECT SYSTEM” screen when the CAN line between
Diag on CAN unit and the data link connector is open.
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For a description of Diag on CAN, refer to
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SKIB8892E
TROUBLE DIAGNOSES WORK FLOW
LAN-27
[CAN FUNDAMENTAL]
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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).
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 fig-
ure).
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.
SKIB8725E
LAN-28
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
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 “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:
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
"CAN Diagnostic Support Monitor"
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SKIB8726E
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