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

Nissan Sentra B18 (2020-2025) Service Manual / Brakes / Brake Control System :: Vdc/tcs/abs / Basic Inspection / Diagnosis and Repair Work Flow

Work Flow

Work Flow

DETAILED FLOW

INTERVIEW THE CUSTOMER
1. Clarify customer concerns before inspection. First of all, perform an interview utilizing Diagnostic Work Sheet and reproduce the symptom as well as fully understand it. Ask customer about his/her concerns carefully. Check symptoms by driving Nissan Sentra vehicle with customer if necessary.
  
  CAUTION:
  
  Customers are not professional. Never guess easily like “maybe the customer means that...,” or “ maybe the customer mentions this symptom”.
>>
GO TO 2.
CHECK SYMPTOM
1. Reproduce the symptom that is indicated by the customer, based on the information from the customer obtained in the interview. Also check that the symptom is not caused by fail-safe mode. Refer to Fail-Safe.
  
  CAUTION:
  
  When the symptom is caused by normal operation, fully inspect each portion and obtain the understanding of customer that the symptom is not caused by a malfunction.
>>
GO TO 3.
PERFORM SELF DIAGNOSTIC RESULT
1. CONSULT
  1. Ignition switch OFF → ON.
    
    CAUTION:
    
    Be sure to wait of 10 seconds after placing ignition switch OFF or ON.
  2. Select “Self Diagnostic Result” mode of “ABS”.
Is DTC detected?
YES >>
Record or print Self Diagnostic Results and Freeze Frame Data (FFD). GO TO 4.
NO >>
GO TO 6.
RECHECK THE SYMPTOM
1. CONSULT
  1. Erase “Self Diagnostic Result” mode of “ABS”.
  2. Ignition switch OFF → ON → OFF.
    
    CAUTION:
    
    Be sure to wait of 10 seconds after placing ignition switch OFF or ON.
  3. Perform DTC confirmation procedures for the malfunctioning system.
    Note:
    If some DTCs are detected at the same time, determine the order for performing the diagnosis based on DTC Inspection Priority Chart.
Is DTC detected?
YES >>
GO TO 5.
NO >>
Check harness and connectors based on the information obtained in the interview. Refer to Intermittent Incident.
REPAIR OR REPLACE MALFUNCTIONING COMPONENT
1. 1. Repair or replace malfunctioning components.
  2. Reconnect component or connector after repairing or replacing it.
  3. When DTC is detected, erase “Self Diagnostic Result” mode of “ABS”.
    
    CAUTION:
>>
GO TO 7.
IDENTIFY MALFUNCTIONING SYSTEM BY SYMPTOM DIAGNOSIS
1. Identify malfunctioning system based on symptom diagnosis and perform inspection.
Can the malfunctioning system be identified?
YES >>
GO TO 7.
NO >>
Check harness and connectors based on the information obtained in the interview. Refer to Intermittent Incident.
FINAL CHECK
1. CONSULT
  1. Select “Data Monitor” mode of “ABS”.
  2. Check the reference values. Refer to Values on the Diagnosis Tool.
  3. Recheck the symptom and check that the symptom is not reproduced in the same conditions.
Is the symptom reproduced?
YES >>
GO TO 3.
NO >>
Inspection End.

Diagnostic Work Sheet

Diagnostic Work Sheet

DESCRIPTION

In general, customers have their own criteria for a problem. Therefore, it is important to understand the symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all the information for the diagnosis, prepare the interview sheet referring to the interview points.
In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.

INTERVIEW SHEET SAMPLE

Interview sheet
Customer name	MR/MS	Registration number	Initial year registration
Customer name	MR/MS	Nissan Sentra Vehicle type	VIN
Storage date		Engine/traction Motor	Mileage	km (Mile)
Symptom		□ Does not operate ( ) function
		□ Warning lamp turns ON. □ or □ or □□ □ Other ( )
		□ Noise (Location: ) □ Vibration (Location: )
		□ Other ( )
First occurrence		□ Recently □ Other ( )
Frequency of occurrence		□ Always □ Under a certain conditions of □ Sometimes ( time(s)/day)
Climate conditions		□ Irrelevant
	Weather	□ Fine □ Cloud □ Rain □Snow □ Others ( )
	Temperature	□ Hot □Warm □ Cool □ Cold □ Temperature [Approx. °C (°F)]
	Relative humidity	□ High □ Moderate □ Low
Road conditions		□ Ordinary road □ Highway □ Mountainous road (uphill or downhill) □ Rough road
Operating condition, etc.		□ Irrelevant □ When engine/traction motor starts □ During idling □ During driving □ During acceleration □ At constant speed driving □ During deceleration □ Immediately before stop [Nissan Sentra Vehicle speed: Approx. km/h (MPH)] □ During cornering (right curve or left curve) □ When steering wheel is steered (to right or to left)
Other conditions	VDC OFF switch operation	□ Yes □ No
	Use of other functions (ex. ICC)	□ Yes □ No ( )
	Presence of non-genuine parts installation	□ Yes □ No ( )

Memo

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