INFINITI FX35 2008 Service Manual

TROUBLE DIAGNOSES WORK FLOWLAN-21
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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
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LAN-22
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TROUBLE DIAGNOSES WORK FLOW
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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TROUBLE DIAGNOSES WORK FLOWLAN-23
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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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3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

LAN-24
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TROUBLE DIAGNOSES WORK FLOW
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).
PKID1216E
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

TROUBLE DIAGNOSES WORK FLOWLAN-25
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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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LAN-26
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TROUBLE DIAGNOSES WORK FLOW
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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TROUBLE DIAGNOSES WORK FLOWLAN-27
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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.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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LAN-28
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TROUBLE DIAGNOSES WORK FLOW
 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.
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TROUBLE DIAGNOSES WORK FLOWLAN-29
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1. SELF-DIAG RESULTS: Inspect the control units indicating “U1000” or “U1001” on SELF-DIAG RESULTS.
2. CAN DIAG SUPPORT MNTR (with PAST): Check t he CAN DIAG SUPPORT MNTR (with PAST) of units
indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indicate
the possible error circuit.
NOTE:
For the details of each indication on CAN DIAG SUPPORT MNTR, refer to LAN-39, "
CAN Diagnostic Sup-
port Monitor".
a. Reception item of “ECM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means ECM could not
receive the signal from ABS in the past. Draw a line between ECM and ABS (line 2-a in the figure below).
b. Reception item of “M&A”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means M&A could not
receive the signal from ABS in the past. Draw a line between M&A and ABS (line 2-b in the figure below).
PKID1221E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

LAN-30
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
c. Reception item of “TCM”: “VDC/TCS/ABS”, “3” is
indicated in the “PAST”. This means TCM could not
receive the signal from ABS in the past. Draw a line between TCM and ABS (line 2-c in the figure below).
3. CAN DIAG SUPPORT MNTR (without PAST): Chec k the CAN DIAG SUPPORT MNTR (without PAST) of
units indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indi-
cate the possible error circuit.
NOTE:
 While an error occurred in the past according to SE LF-DIAG RESULTS, it is unclear which signal is not
received. Assume that errors were detected from all reception items.
 Draw a single line among the unit and all reception it ems. (Work flow differs from CAN DIAG SUPPORT
MNTR (with PAST).)
a. Reception item of “EPS”: Assume that the unit could not receive the signals from ECM, ABS, and M&A.
Draw a line among EPS, ECM, ABS, and M&A (line 3-a in the figure below).
PKID1222E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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