INFINITI QX56 2011 Factory Service Manual

ENGINE CONTROL SYSTEMEC-127
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JCBWM2102GB
Revision: 2010 May2011 QX56

EC-128
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ENGINE CONTROL SYSTEM
JCBWM2103GB
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEMEC-129
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JCBWM2104GB
Revision: 2010 May2011 QX56

EC-130
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ENGINE CONTROL SYSTEM
JCBWM2105GB
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEMEC-131
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JCBWM2106GB
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EC-132
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ENGINE CONTROL SYSTEM
JCBWM2107GB
Revision: 2010 May2011 QX56

ENGINE CONTROL SYSTEMEC-133
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JCBWM2108GB
Revision: 2010 May2011 QX56

EC-134
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ENGINE CONTROL SYSTEM
JCBWM2109GB
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORKFLOWEC-135
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000006217737
OVERALL SEQUENCE
DETAILED FLOW
JMBIA1416GB
Revision: 2010 May2011 QX56

EC-136
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DIAGNOSIS AND REPAIR WORKFLOW
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 t he “Diagnostic Work Sheet”. (Refer to EC-138, "
Diagnostic Work
Sheet".)
>> GO TO 2.
2.CHECK DTC
1. Check DTC.
2. Perform the following procedure if DTC is displayed.
- Record DTC and freeze frame data. (Print them out with CONSULT-III or GST.)
- Erase DTC. (Refer to “How to Erase DTC and 1st Trip DTC” in EC-63, "
CONSULT-III Function" or
EC-60, "
On Board Diagnosis Function".)
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
(Symptom Matrix Chart is useful. Refer to EC-524, "
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-s afe related to the symptom. Refer to EC-529, "
Description" and EC-
93, "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-s afe related to the symptom. Refer to EC-529, "
Description" and EC-
93, "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 disp layed DTC, and then check that DTC is detected
again.
If two or more DTCs are detected, refer to EC-96, "
DTC Inspection Priority Chart" and determine trouble diag-
nosis order.
NOTE:
 Freeze frame data is useful if the DTC is not detected.
 Perform Component Function Check if DTC CONFIR MATION PROCEDURE is not included on Service
Manual. This simplified check procedure is an effect ive 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-40, "
Intermittent Incident".
6.PERFORM BASIC INSPECTION
Perform EC-139, "
Work Procedure".
Revision: 2010 May2011 QX56