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For abbreviations, refer to LAN-37, "Abbreviation List".
DETECT THE ROOT CAUSE
Identif INFINITI FX35 2008 Service Manual
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For abbreviations, refer to LAN-37, "Abbreviation List".
DETECT THE ROOT CAUSE
Identif](/manual-img/42/57017/w960_57017-3040.png)
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For abbreviations, refer to LAN-37, "Abbreviation List".
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 short ed. Refer to "Present Error — Short Circuit —", "Past
Error — Short Circuit —".
Refer to the following for details of the trouble diagnosis procedure.
"Present Error — Open Circuit —"
"Present Error — Short Circuit —"
"Past Error — Open Circuit —"
"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.
Present Error — Open Circuit —
PKID1213E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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Identify the error circuit using information from t
he “CAN DIAG SUPPORT MNTR” (“ECU list” included).
1. ECU list: INFINITI FX35 2008 Service Manual
LAN-22
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Identify the error circuit using information from t
he “CAN DIAG SUPPORT MNTR” (“ECU list” included).
1. ECU list:](/manual-img/42/57017/w960_57017-3041.png)
LAN-22
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Identify the error circuit using information from t
he “CAN DIAG SUPPORT MNTR” (“ECU list” included).
1. ECU list: Check the items indicat ed 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 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 “E CU 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 below).
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-5, "
Diag on CAN".
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 below).
NOTE:
If “UNKWN” is indicated on “TRANSMIT DIAG”, t hen 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 “T CM”, “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).
PKID1214E
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c. Reception item of “AV”: “UNKWN” is not indicat ed. 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 “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:
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On CAN DIAG SUPPORT MNTR (without PAST), “UNK
WN” 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-39,
"CAN Diagnostic Support Monitor".
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 below).
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 below).
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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”: “UNKWN” is not i ndicated. 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 betw een 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.
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Reception item of “IPDM-E”: On “E
CM”, “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 below).
4. Through the above procedure, the error is detected in the TCM branch line (shaded in the figure below). NOTE:
For abbreviations, refer to LAN-37, "
Abbreviation List".
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5. Perform the inspection for the detected error ci rcuit. For the inspection procedure, refer to LAN-68, "Mal-
function Area Chart".
Present Error — Short Circuit —
When the symptoms listed below exist, a short circui t 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
PKID1219E
Item (CONSULT-III) Indication
ECU list (on the CAN DIAG SUPPORT MNTR) A ll Diag on CAN units are not indicated.
CAN DIAG SUPPORT MNTR “UNKWN” is indicated un der “TRANSMIT DIAG” and most reception items.
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Refer to
LAN-68, "Malfunction Area Chart".
Past Error — Open Circuit —
Review CAN communication signal chart based on information received from the interview with the customer
and on past error information from SELF-DIAG RESULTS and CAN DIAG SUPPORT MNTR.
PKID1220E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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