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Nissan Armada 2025-2026 Service and Repair Manual: Lan System. Can Fundamental

Nissan Armada 2025-2026 Service and Repair Manual / Electrical & Power Control / Lan System. Can Fundamental

Precautions

Precautions for Trouble Diagnosis

CAUTION:

Follow the instructions listed below. Failure to do this may cause damage to parts:

  • Never apply 7.0 V or more to the measurement terminal.

  • Use a tester with open terminal voltage of 7.0 V or less.

  • Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when checking the harness.

Precautions for Harness Repair

  • Solder the repaired area and wrap tape around the soldered area.

    NOTE:

    A fray of twisted lines must be within 110 mm (4.33 in).

  • Bypass connection is never allowed at the repaired area.

    NOTE:

    Bypass connection may cause CAN communication error. The spliced wire becomes separated and the characteristics of twisted line are lost.

  • Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communication line.

Diagnosis and Repair Work Flow

Trouble Diagnosis Flow Chart

DESCRIPTION

DETAIL OF TROUBLE DIAGNOSIS FLOW CHART

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

  • Result: Symptom

Notes for checking error symptoms:

  • 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.

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GO TO 2.

INSPECTION OF vehicle CONDITION

Check whether the symptom is reproduced or not.

NOTE:

Do not turn the ignition switch OFF or disconnect the 12V battery cable while reproducing the error. The error may temporarily correct itself, making it difficult to determine the root cause.

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GO TO 3.

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

NOTE:

This vehicle does not need to confirm the CAN system type.

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GO TO 4.

CREATE INTERVIEW SHEET

Fill out the symptom described by the customer and vehicle condition on the interview sheet.

NOTE:

Interview Sheet (Example)

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GO TO 5.

DETECT THE ROOT CAUSE

"Network Diagnosis" function of CONSULT detects a root cause.

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GO TO 6.

REPAIR OR REPLACE MALFUNCTIONING PART

Repair or replace malfunctioning parts identified by "Network Diagnosis" function of CONSULT.

vehicle CAN communication circuit>>

Refer to Vehicle CAN Communication Circuit.

ITS CAN communication circuit>>

Refer to ITS CAN Communication Circuit.

Chassis CAN communication circuit>>

Refer to Chassis CAN Communication Circuit.

Drivetrain CAN communication circuit>>

Refer to Drivetrain CAN Communication Circuit.

Engine CAN communication circuit>>

Refer to Engine CAN Communication Circuit.

IT CAN communication circuit>>

Refer to IT CAN Communication Circuit.

Diagnostic CAN communication circuit>>

Refer to Diagnostic CAN Communication Circuit.

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