Nissan Titan A60. Manual - part 360

EC-106

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DIAGNOSIS AND REPAIR WORKFLOW

Overall Sequence

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 WORKSHEET" .

>> GO TO 2.

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DIAGNOSIS AND REPAIR WORKFLOW

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2.

CHECK DTC*

1

1. Check DTC*

1

 .

2. Perform the following procedure if DTC*

1

  is displayed.

-

Record DTC*

1

  and freeze frame data*

2

 . (Print them out with CONSULT-III or GST.)

-

Erase DTC*

1

 . (Refer to 

EC-72, "DTC Index"

 .)

-

Study the relationship between the cause detected by DTC*

1

  and the symptom described by the cus-

tomer. (Symptom Matrix Chart is useful. Refer to 

EC-468, "Symptom Matrix Chart"

 .)

3. Check related service bulletins for information.
Is any symptom described and any DTC detected?

Symptom is described, DTC*

1

  is displayed>>GO TO 3.

Symptom is described, DTC*

1

  is not displayed>>GO TO 4.

Symptom is not described, DTC*

1

  is displayed>>GO TO 5.

3.

CONFIRM THE SYMPTOM

Try to confirm the symptom described by the customer (except MIL ON).

DIAGNOSIS WORK SHEET is useful to verify the incident.

Connect CONSULT-III to the vehicle and check real time diagnosis results.

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.

DIAGNOSIS WORK SHEET is useful to verify the incident.

Connect CONSULT-III to the vehicle and check real time diagnosis results.

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*

1

 , and then make sure that DTC*

1

  is detected

again.
If two or more DTCs*

1

  are detected, refer to 

EC-71, "DTC Inspection Priority Chart"

  and determine trouble

diagnosis order.

NOTE:
• Freeze frame data*

2

  is useful if the DTC*

1

  is not detected.

• Perform Overall Function Check if DTC Confirmation Procedure is not included on Service Manual. This

simplified check procedure is an effective alternative though DTC*

1

  cannot be detected during this check.

If the result of Overall Function Check is NG, it is the same as the detection of DTC*

1

  by DTC Confirmation

Procedure.

Is DTC*

1

  detected?

Yes

>> GO TO 10.

No

>> Check according to 

GI-36, "How to Check Terminal"

 and 

GI-39, "Intermittent Incident"

.

6.

PERFORM BASIC INSPECTION

Perform 

EC-110, "Basic Inspection"

 .

With CONSULT-III>>GO TO 7.

Without CONSULT-III>>GO TO 9.

7.

PERFORM SPEC IN DATA MONITOR MODE

 With CONSULT-III

Make sure that “MAS A/F SE-B1”, “B/FUEL SCHDL”, and “A/F ALPHA-B1”, “A/F ALPHA-B2” are within the SP

value using CONSULT-III “SPEC” in “DATA MONITOR” mode. Refer to 

EC-128

 .

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DIAGNOSIS AND REPAIR WORKFLOW

Are they 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-129, "Diagnosis Procedure"

 .

Is malfunctioning part detected?

Yes

>> GO TO 11.

No

>> GO TO 9.

9.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM MATRIX CHART

Detect malfunctioning system according to 

EC-468, "Symptom Matrix Chart"

  based on the confirmed symp-

tom in step 4, and determine the trouble diagnosis order based on possible causes and symptom.

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE

Inspect according to Diagnostic Procedure of the system.

NOTE:

The Diagnostic Procedure in EC section described based on open circuit inspection. A short circuit inspection

is also required for the circuit check in the Diagnostic Procedure. For details, refer to Circuit Inspection in 

GI-

35, "Work Flow"

 .

Is 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-61, "ECM Terminal and Reference Value"

 , 

EC-58, "CONSULT-III Reference

Value in Data Monitor Mode"

 .

11.

REPAIR OR REPLACE THE MALFUNCTIONING PART

1. Repair or replace the malfunctioning part.

2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-

ment.

3. Check DTC. If DTC is displayed, erase it, refer to 

EC-72, "DTC Index"

 .

>> GO TO 12.

12.

FINAL CHECK

When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall 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.
OK or NG

NG (DTC*

1

  is detected)>>GO TO 10.

NG (Symptom remains)>>GO TO 6.

OK

>> 1. Before returning the vehicle to the customer, make sure to erase unnecessary DTC*

1

  in ECM

and TCM (Transmission Control Module). (Refer to 

EC-72, "DTC Index"

  and 

TM-34, "OBD-II

Diagnostic Trouble Code (DTC)"

.)

2. If the completion of SRT is needed, drive vehicle under the specific driving pattern. Refer to

EC-72, "DTC Index"

 .

3. INSPECTION END

*1: Include 1st trip DTC.

*2: Include 1st trip freeze frame data.

DIAGNOSTIC WORKSHEET

Description

DIAGNOSIS AND REPAIR WORKFLOW

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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 a incident. It is

important to fully understand the symptoms or conditions for a cus-

tomer complaint.

Utilize a diagnostic worksheet like the one on the next page in order

to organize all the information for troubleshooting.

Some conditions may cause the MIL to come on steady 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.

Worksheet Sample

SEF907L

MTBL0017