Infiniti QX56 (Z62). Manual - part 539

 

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Infiniti QX56 (Z62). Manual - part 539

 

 

EC-134

< WIRING DIAGRAM >

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ENGINE CONTROL SYSTEM

JCBWM2109GB

DIAGNOSIS AND REPAIR WORKFLOW

EC-135

< BASIC INSPECTION >

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000006217737

OVERALL SEQUENCE

DETAILED FLOW

JMBIA1416GB

EC-136

< BASIC INSPECTION >

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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 the “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-safe 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-safe 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 displayed 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 CONFIRMATION PROCEDURE is not included on Service

Manual. 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-40, "Intermittent Incident"

.

6.

PERFORM BASIC INSPECTION

Perform 

EC-139, "Work Procedure"

.

DIAGNOSIS AND REPAIR WORKFLOW

EC-137

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Will CONSULT-III be used?

YES

>> GO TO 7.

NO

>> GO TO 9.

7.

PERFORM SPEC IN DATA MONITOR MODE

 WITH CONSULT-III

Check that “MAS A/F SE-B1”, “B/FUEL SCHDL”, “A/F ALPHA-B1” and “A/F ALPHA-B2” are within the SP
value using “SPEC” in “DATA MONITOR” mode with  CONSULT-III. Refer to 

EC-161, "Component Function

Check"

.

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 

EC-162, "Diagnosis Procedure"

.

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 

EC-524, "Symptom Table"

 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 

GI-43, "Circuit Inspec-

tion"

.

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-III. Refer to 

EC-72, "Reference Value"

.

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. Refer to “How to Erase DTC and 1st Trip DTC” in 

EC-63,

"CONSULT-III Function"

 or 

EC-60, "On Board Diagnosis Function"

.

>> GO TO 12.

12.

FINAL CHECK

When DTC was detected in step 2, perform DTC CONFIRMATION PROCEDURE or Component Function
Check again, and then check that the malfunction have been completely repaired.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and check 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

>> Before returning the vehicle to the customer, always erase unnecessary DTC in ECM and TCM

(Transmission Control Module). (Refer to “How to Erase DTC and 1st Trip DTC” in 

EC-63,

"CONSULT-III Function"

 or 

EC-60, "On Board Diagnosis Function"

.) If the completion of SRT is

 

 

 

 

 

 

 

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