Nissan Qashqai J11. Manual - part 286

DIAGNOSIS AND REPAIR WORKFLOW

ECM-121

< BASIC INSPECTION >

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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 

ECM-123, "Diagnostic Work

Sheet"

.)

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

ECM-65, "CONSULT Function"

.

•

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

ECM-63, "On Board Diagnosis Func-

tion"

.

-

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

ECM-407, "Symptom Table"

.)

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 fail-safe related to the symptom. Refer to 

ECM-87, "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 fail-safe related to the symptom. Refer to 

ECM-87, "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 

ECM-91, "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

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-41, "Intermittent Incident"

.

6.

PERFORM BASIC INSPECTION

ECM-122

< BASIC INSPECTION >

[MR20DD]

DIAGNOSIS AND REPAIR WORKFLOW

Perform 

ECM-132, "Work Procedure"

.

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 

ECM-137, "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 

ECM-138, "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 

ECM-407, "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. Refer to 

ECM-73, "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.

>> 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 

ECM-65, "CONSULT Function"

.)

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 

ECM-63, "On Board Diag-

nosis Function"

.)

DIAGNOSIS AND REPAIR WORKFLOW

ECM-123

< BASIC INSPECTION >

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Diagnostic Work Sheet

INFOID:0000000010702856

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.

WORKSHEET SAMPLE

SEF907L

MTBL0017

ECM-124

< BASIC INSPECTION >

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ADDITIONAL SERVICE WHEN REPLACING ECM

ADDITIONAL SERVICE WHEN REPLACING ECM

Description

INFOID:0000000010702857

When replacing ECM, the following procedure must be performed. (For details, refer to 

ECM-124, "Work Pro-

cedure"

.)

PROGRAMMING OPERATION

NOTE:
After replacing with a blank ECM, programming is required to write ECM information. Be sure to follow the pro-
cedure to perform the programming.

Work Procedure

INFOID:0000000010702858

1.

SAVE ECM DATA

With CONSULT

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Turn ignition switch ON.

4.

Select “SAVING DATA FOR REPLC CPU” in “WORK SUPPORT” mode of “ENGINE” using CONSULT.

5.

Follow the instruction of CONSULT display.

NOTE:
• Necessary data in ECM is copied and saved to CONSULT.
• Go to Step 2 regardless of with or without success in saving data.

>> GO TO 2.

2.

CHECK ECM PART NUMBER

Check ECM part number to see whether it is blank ECM or not.
NOTE:
• Part number of blank ECM is 23703 - 

×××××

.

• Check part number when ordering ECM or the one included in the label on the container box.
Is the ECM a blank ECM?

YES

>> GO TO 3.

NO

>> GO TO 5.

3.

SAVE ECM PART NUMBER

Read out the part number from the old ECM and save the number, following the programming instructions.
Refer to CONSULT Operation Manual.
NOTE:
• The ECM part number is saved in CONSULT.
• Even when ECM part number is not saved in CONSULT, go to 4.

>> GO TO 4.

4.

PERFORM ECM PROGRAMMING

After replacing ECM, perform the ECM programming. Refer to CONSULT Operation Manual.
NOTE:
• Refer to 

ECM-416, "Removal and Installation"

 for replacement of ECM.

• During programming, maintain the following conditions:
- Ignition switch: ON
- Electric load: OFF
- Brake pedal: Not depressed
- Battery voltage: 12 – 13.5 V (Be sure to check the value of battery voltage by selecting “BATTERY VOLT” in

“Data monitor” of CONSULT.)

>> GO TO 6.

5.

REPLACE ECM