Nissan Pathfinder (2012 year). Manual — part 450

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< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

• Refer to “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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DIAGNOSIS AND REPAIR WORKFLOW

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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-56, "CAN Diagnostic Sup-

port Monitor"

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a. Reception item of “ENGINE”: “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 “METER/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).

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< BASIC INSPECTION >

[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

c.

Reception item of “TRANSMISSION”: “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 fig-

ure 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).

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DIAGNOSIS AND REPAIR WORKFLOW

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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-53, "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).

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[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

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

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DIAGNOSIS AND REPAIR WORKFLOW

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b. The tachometer moved normally: Put check marks between ECM and M&A. The circuit between ECM and

M&A is functioning properly (check marks 5-b in the figure below).

6. The circuit which has the most amount of lines are the possible cause. Error is detected from ABS actua-

tor and electric unit (control unit) branch line (shaded in the figure below).

NOTE:

For abbreviations, refer to

LAN-36, "Abbreviation List"

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[CAN FUNDAMENTAL]

DIAGNOSIS AND REPAIR WORKFLOW

7. Perform the inspection procedure for the possible cause. Refer to “MALFUNCTION AREA CHART”.

Past Error — Short Circuit —

When the symptoms listed below exist, a short circuit of the CAN communication line is a possible cause.

PKID1224E

Item (CONSULT)

Indication

Inspection procedure

SELF-DIAG RESULTS

DTC of CAN communication is indicated in the past for most
units.

Refer to “MALFUNCTION AREA
CHART”.

CAN DIAG SUPPORT MNTR

Only on CAN DIAG SUPPORT MNTR (with PAST), “1 - 39” is in-
dicated on “PAST” of “TRANSMIT DIAG” and the reception item.

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