Nissan X-Trail 32. Instruction — part 752
DIAGNOSIS AND REPAIR WORKFLOW
EC-137
< BASIC INSPECTION >
[MR20DD]
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DETAILED FLOW
1.
GET INFORMATION FOR SYMPTOM
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
Malfunction information, obtained>>GO TO 2.
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”. Refer to the following.
•
With CONSULT: “How to Erase DTC and 1st Trip DTC” in
•
Without CONSULT: “How to Erase Self-diagnostic Results” in
EC-79, "On Board Diagnosis Function"
.
-
Study the relationship between the cause detected by DTC and the symptom described by the customer.
(Symptom Table is useful. Refer to
3.
Check related service bulletins for information.
Is any symptom described and is any DTC 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
.
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 Refer to
and
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 check that DTC is detected
again.
If two or more DTCs are detected, refer to
EC-107, "DTC Inspection Priority Chart"
and determine trouble
diagnosis order.
NOTE:
• Freeze frame data is useful if the DTC is not detected.
• Perform Component Function Check if DTC CONFIRMATION PROCEDURE is not included on Service
Instruction. This simplified check procedure is an effective alternative though DTC cannot be detected during
this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC CONFIR-
MATION PROCEDURE.
Is DTC detected?
YES
>> GO TO 10.
NO
>> Check according to
GI-44, "Intermittent Incident"
.
EC-138
< BASIC INSPECTION >
[MR20DD]
DIAGNOSIS AND REPAIR WORKFLOW
6.
PERFORM BASIC INSPECTION
Perform
Do you have CONSULT?
YES
>> GO TO 7.
NO
>> GO TO 9.
7.
PERFORM SPEC IN DATA MONITOR MODE
With CONSULT
Check that “MASS AIR FLOW SENSOR (Hz)”, “B/FUEL SCHDL”, and “A/F ALPHA-B1” are within the SP
value using “SPEC” in “DATA MONITOR” mode with CONSULT. Refer to
.
Is the measurement value within the SP value?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE
Detect malfunctioning part according to
.
Is a malfunctioning part detected?
YES
>> GO TO 11.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE
Detect malfunctioning system according to
based on the confirmed symptom in
step 4, and determine the trouble diagnosis order based on possible causes and symptoms.
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART BY DIAGNOSIS PROCEDURE
Inspect according to Diagnosis Procedure of the system.
NOTE:
The Diagnosis Procedure in EC section described based on open circuit inspection. A short circuit inspection
is also required for the circuit check in the Diagnosis Procedure. For details, refer to
.
Is a malfunctioning part detected?
YES
>> GO TO 11.
NO
>> Monitor input data from related sensors or check voltage of related ECM terminals using CON-
SULT. Refer to
11.
REPAIR OR REPLACE THE MALFUNCTIONING PART
1.
Repair or replace the malfunctioning part.
2.
Reconnect parts or connectors disconnected during Diagnosis Procedure again after repair and replace-
ment.
3.
Check DTC. If DTC is displayed, erase it.
>> GO TO 12.
12.
FINAL CHECK
When DTC was detected in step 2, perform DTC CONFIRMATION PROCEDURE or Component Function
Check again, and then make sure that the malfunction have been repaired securely.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and make sure
that the symptom is not detected.
Is DTC detected and does symptom remain?
YES-1 >> DTC is detected: GO TO 10.
YES-2 >> Symptom remains: GO TO 6.
NO-1
>>
With CONSULT: Before returning the vehicle to the customer, make sure to erase unnecessary
DTC in ECM. (Refer to “How to Erase DTC and 1st Trip DTC” in
DIAGNOSIS AND REPAIR WORKFLOW
EC-139
< BASIC INSPECTION >
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NO-2
>>
Without CONSULT: Before returning the vehicle to the customer, make sure to erase unneces-
sary DTC in ECM. (Refer to “How to Erase Self-diagnostic Results” in
Diagnostic Work Sheet
INFOID:0000000010775075
DESCRIPTION
There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
bleshooting faster and more accurate.
In general, each customer feels differently about symptoms. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the WORKSHEET SAMPLE
below in order to organize all the information for troubleshooting.
Some conditions may cause the MIL to illuminate or blink, and DTC
to be detected. Examples:
• Vehicle ran out of fuel, which caused the engine to misfire.
• Fuel filler cap was left off or incorrectly screwed on, allowing fuel to
evaporate into the atmosphere.
SEF907L
EC-140
< BASIC INSPECTION >
[MR20DD]
DIAGNOSIS AND REPAIR WORKFLOW
WORKSHEET SAMPLE
MTBL0017
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