Nissan Sentra Service Manual: Basic inspection
Diagnosis and repair workflow
Trouble diagnosis flow chart
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
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)
Note:
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.
Interview sheet (example)
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 ...
Can
...
Other materials:
B0091 Front side air bag satellite sensor LH
Description
DTC B0091 FRONT SATELLITE SENSOR LH
The front side air bag satellite sensor LH is wired to the air bag diagnosis
sensor unit. The air bag diagnosis
sensor unit will monitor the front side air bag satellite sensor LH for internal
failures and its circuits for communication
errors. ...
Diagnosis and repair workflow
Work Flow
OVERALL SEQUENCE
DETAILED FLOW
1. OBTAIN INFORMATION ABOUT SYMPTOM
Interview the customer to obtain as much information as possible about the
conditions and environment under
which the malfunction occurred.
>> GO TO 2.
2. CONFIRM THE SYMPTOM
Check the malfunction on the ...
Warning lights
Anti-lock
Braking
System (ABS) warning light
When the ignition switch is placed in the ON
position, the Anti-lock Braking System (ABS)
warning light illuminates and then turns off. This
indicates the ABS is operational.
If the ABS warning light illuminates while the
engine is running or ...
