Nissan Pathfinder (2009 year). Manual - part 491

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DIAGNOSIS AND REPAIR WORKFLOW

Trouble Diagnosis Flow Chart

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Trouble Diagnosis Procedure

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INTERVIEW WITH CUSTOMER

Interview with the customer is important to detect the root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.

Points in interview

• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment

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• Result: Symptom
NOTE:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates

tachometer functions normally.

• When a CAN communication system error is present, multiple control units may malfunction or go into fail-

safe mode.

• Indication of the combination meter is important to detect the root cause because it is the most obvious to

the customer, and it performs CAN communication with many units.

INSPECTION OF VEHICLE CONDITION

• Check whether or not “U1000” or “U1001” is indicated on “SELF-DIAG RESULTS” by CONSULT-III.

NOTE:
Root cause cannot be detected using the procedure in this section if “U1000” or “U1001” is not indicated.

• Check whether the symptom is reproduced or not.

NOTE:
• Do not turn the ignition switch OFF or disconnect the battery cable while reproducing the error. The error

may temporarily correct itself, making it difficult to determine the root cause.

• The procedures for present errors differ from the procedures for past errors. Refer to “DETECT THE

ROOT CAUSE”.

CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)

Determine CAN system type based on vehicle equipment. Then choose the correct diagnosis sheet.
NOTE:
There are two styles for CAN system type specification charts. Depending on the number of available system
types, either style A or style B may be used.

CAN System Type Specification Chart (Style A)

NOTE:

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DIAGNOSIS AND REPAIR WORKFLOW

CAN system type is easily checked with the vehicle equipment identification information shown in the chart.

CAN System Type Specification Chart (Style B)

NOTE:

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CAN system type is easily checked with the vehicle equipment identification information shown in the chart.

CREATE INTERVIEW SHEET

Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview
sheet.

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Interview Sheet (Example)

COLLECT DATA

Collect CONSULT-III Data

Print out or save the following CONSULT-III data.
• SELF-DIAG RESULTS
• CAN DIAG SUPPORT MNTR (“ECU list” included)
NOTE:

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Some items may not be needed depending on CAN system type of vehicle.

Create On-board Diagnosis Copy Sheet

Display the trouble diagnosis result of CAN communication with the on-board diagnosis function on the vehicle
monitor, etc. Copy them on the on-board diagnosis copy sheet.
NOTE:

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For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-III is
not available.)

CREATE DIAGNOSIS SHEET

NOTE:
Be sure to use the diagnosis sheet for the correct CAN system type.

Print Diagnosis Sheet

Print the diagnosis sheet for the applicable CAN system type.

Check Collected Data

Make sure that all ECUs are received, referring to “ECU list”.

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• For abbreviations, refer to 

LAN-36, "Abbreviation List"

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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 shorted. 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 —

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