Nissan Quest E52. Instruction — part 478

EC-122

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ENGINE CONTROL SYSTEM

JRBWC3945GB

ENGINE CONTROL SYSTEM

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EC-124

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DIAGNOSIS AND REPAIR WORKFLOW

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

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OVERALL SEQUENCE

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DIAGNOSIS AND REPAIR WORKFLOW

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DETAILED FLOW

1.

GET INFORMATION FOR SYMPTOM

1.

Get the detailed information from the customer about the symptom (the condition and the environment
when the incident/malfunction occurred) using the “Diagnostic Work Sheet”. (Refer to

EC-127, "Diagnostic

Work Sheet"

.)

2.

Ask if the customer requests I/M examination.

Malfunction information, obtained>>GO TO 2.
No Malfunction information, but a request for I/M examination>>GO TO 13.

2.

CHECK DTC

1.

Check DTC of “All DTC Reading”.

2.

Perform the following procedure if DTC is displayed.

-

Record DTC and freeze frame data. (Print them out with CONSULT or GST.)

-

Erase only DTC of “ENGINE”.
With CONSULT: Refer to “How to Erase DTC and 1st Trip DTC” in

EC-69, "CONSULT Function"

.

Without CONSULT: Refer to “How to Erase Self-diagnostic Results” in

EC-66, "On Board Diagnosis

Function"

.

-

Turn ignition switch OFF.

-

Study the relationship between the cause detected by DTC and the symptom described by the customer.
(Symptom Table is useful. Refer to

EC-450, "Symptom Table"

.)

3.

Check related service bulletins for information.

Are any symptoms described and any DTCs detected?

Symptom is described, DTC is detected>>GO TO 3.
Symptom is described, DTC is not detected>>GO TO 4.
Symptom is not described, DTC is detected>>GO TO 5.

3.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer (except MIL ON).
Also study the normal operation and fail-safe related to the symptom. Refer to

EC-454, "Description"

and

EC-

92, "Fail-safe"

.

Diagnosis Work Sheet is useful to verify the incident.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 5.

4.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer.
Also study the normal operation and fail-safe related to the symptom. Refer to

EC-454, "Description"

and

EC-

92, "Fail-safe"

.

Diagnosis Work Sheet is useful to verify the incident.
Verify relation between the symptom and the condition when the symptom is detected.

>> GO TO 6.

5.

PERFORM DTC CONFIRMATION PROCEDURE

Perform DTC CONFIRMATION PROCEDURE for the displayed DTC, and then make sure that DTC is
detected again.
If two or more DTCs are detected, refer to

EC-94, "DTC Inspection Priority Chart"

and determine trouble

diagnosis order.
NOTE:
• Freeze frame data is useful if the DTC is not detected.

*1: Include 1st trip DTC.

*2: Include 1st trip freeze frame data.