Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis and Repair Workflow

Trouble Diagnosis Flow Chart

DESCRIPTION

DETAIL OF TROUBLE DIAGNOSIS FLOW CHART

1. INTERVIEW WITH CUSTOMER

   Interview with the customer is important to detect the root cause of CAN communication system errors and to understand Nissan Sentra 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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2. INSPECTION OF Nissan Sentra 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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3. CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)

   Determine CAN system type based on Nissan Sentra vehicle equipment.

   Note:

   • This chart is used if CONSULT does not automatically recognize CAN system type.

   • 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:

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

     

   • CAN System Type Specification Chart (Style B)

     Note:

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

     
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4. CREATE INTERVIEW SHEET

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

   Note:

   Interview Sheet (Example)

   
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5. DETECT THE ROOT CAUSE

   CAN diagnosis function of CONSULT detects a root cause.

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6. REPAIR OR REPLACE MALFUNCTIONING PART

   Repair or replace malfunctioning parts identified by CAN diagnosis function of CONSULT.

   Nissan Sentra Vehicle CAN communication 1 circuit>>

   Refer to Vehicle CAN Communication 1 Circuit.

   Vehicle CAN communication 2 circuit>>

   Refer to Nissan Sentra Vehicle CAN Communication 2 Circuit.

   ITS CAN communication circuit>>

   Refer to ITS CAN Communication Circuit.

   Chassis CAN communication 1 circuit>>

   Refer to Chassis CAN Communication 1 Circuit.

   Chassis CAN communication 2 circuit>>

   Refer to Chassis CAN Communication 2 Circuit.

   Chassis CAN communication 3 circuit>>

   Refer to Chassis CAN Communication 3 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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