Nissan Sentra Service Manual: Basic inspection

Nissan Sentra Service Manual / Electrical & power control / Lan system / Can fundamental / Basic inspection

Diagnosis and repair workflow

Trouble diagnosis flow chart

Trouble diagnosis procedure

Trouble diagnosis procedure

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 failsafe 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

Inspection of vehicle condition

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.

Check of can system type (how to use can system type specification chart)

Determine can system type based on 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 vehicle equipment identification information shown in the chart.

Can system type specification chart (style b)

Can system type specification chart (style b)

Note:

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

Create interview sheet

Create interview sheet

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

Interview sheet (example)

Detect the root cause

Detect the root cause

Can diagnosis function of consult detects the root cause.

System description

System Can communication system Can communication system : system description CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex ...

Other materials:

Driver side door mirror defogger
Description Heats the heating wire with the power supply from the rear window defogger relay to prevent the door mirror from fogging up. Component Function Check Check that heating wire of door mirror defogger lh is heated when turning the rear window defogger switch on. Is the inspect ...

Automatic door locks
All doors lock automatically when the vehicle speed reaches 15 MPH (24 km/h). All doors unlock automatically when the ignition is placed in the OFF position (models with Intelligent Key system) or when the key is removed from the ignition switch (models without Intelligent Key system) ...

Basic inspection
Diagnosis and repair work flow Work flow OVERALL SEQUENCE DETAILED FLOW 1.GET INFORMATION FOR SYMPTOM Get detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurs). Check operation condition of the function th ...