Nissan Armada 2025-2026 Service and Repair Manual: Diagnosis and Repair Work Flow

Work Flow

DETAILED FLOW

INTERVIEW FROM THE CUSTOMER

Clarify customer complaints before inspection. First of all, perform an interview utilizing Diagnostic Work Sheet and reproduce symptoms as well as fully understand it. Ask customer about his/her complaints carefully. Check symptoms by driving 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

Reproduce the symptom that is indicated by the customer, based on the information from the customer obtained by interview. Also check that the symptom is not caused by fail-safe function. 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-DIAGNOSIS

With CONSULT

Perform self-diagnosis for “AWD/4WD”.

Is any DTC detected?

YES>>

Record or print self-diagnosis results. GO TO 4.

NO>>

GO TO 6.

RECHECK SYMPTOM

With CONSULT

1. Erase self-diagnostic results for “AWD/4WD”.

2. Perform DTC confirmation procedures for the error detected 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 any DTC detected?

YES>>

GO TO 5.

NO >>

Check harness and connectors based on the information obtained by interview. Refer to Intermittent Incident.

REPAIR OR REPLACE ERROR-DETECTED PARTS

• Repair or replace error-detected parts.

• Reconnect part or connector after repairing or replacing.

• When DTC is detected, erase self-diagnostic results for “AWD/4WD”.

>>

GO TO 7.

IDENTIFY ERROR-DETECTED SYSTEM BY SYMPTOM DIAGNOSIS

Estimate error-detected system based on symptom diagnosis and perform inspection.

Can the error-detected system be identified?

YES>>

GO TO 5.

NO >>

Check harness and connectors based on the information obtained by interview. Refer to Intermittent Incident.

FINAL CHECK

With CONSULT

1. Check the reference value for “AWD/4WD”.

2. Recheck the symptom and check that symptom is not reproduced on the same conditions.

Is the symptom reproduced?

YES>>

GO TO 3.

NO>>

INSPECTION END

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
		vehicle type		VIN
Storage date		Engine		Mileage	km (   Mile)
Symptom		□vehicle does not enter 4WD mode.
		□4WD warning lamp turns on.
		□Heavy tight-corner braking symptom occurs
		□Noise  □Vibration
		□Others (                                     )
First occurrence		□Recently  □Others (                          )
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		□Urban area  □Suburb area  □High way □Mounting road (uphill or down hill)  □Rough road
Operation conditions, etc.		□Irrelevant □When engine starts  □During idling □During driving  □During acceleration  □At constant speed driving □During deceleration  □During cornering (right curve or left curve)
Other conditions
Memo