Infiniti FX35 / FX45. Manual - part 763

TROUBLE DIAGNOSES WORK FLOW

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[CAN FUNDAMENTAL]

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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 the 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"

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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

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< 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): Check 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 SELF-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 items. (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

TROUBLE DIAGNOSES WORK FLOW

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[CAN FUNDAMENTAL]

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b.

Reception item of “ABS”: Assume that the unit could not receive the signal from ECM. Draw a line
between ABS and ECM (line 3-b in the figure below).

4.

Search for the possible cause using CAN communication signal chart using information from the interview
with the customer.
NOTE:
For the details of CAN communication signal, refer to 

LAN-44, "CAN Communication Signal Chart"

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a.

ABS warning lamp turned ON and speedometer did not move: This means that “ABS warning lamp signal”
and “Vehicle speed signal” could not communicate between M&A and ABS (4-a in the figure below).

PKID1223E

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[CAN FUNDAMENTAL]

TROUBLE DIAGNOSES WORK FLOW

b.

The tachometer moved normally: This means that “Engine speed signal” could communicate normally
between ECM and M&A (4-b in the figure below).

5.

Fill out the diagnosis sheet based on information from step 4.

a.

The ABS warning lamp turned ON and speedometer did not move: Assume that a possible cause is no
communication between M&A and ABS. Draw a line between M&A and ABS. (Line 5-a in the figure
below).

SKIB8895E