Nissan Sentra. Manual - part 358

EC-128

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DIAGNOSIS AND REPAIR WORKFLOW

YES

>> GO TO 10.

NO

>> Check according to 

EC-94, "DTC Index"

.

6.

PERFORM BASIC INSPECTION

Perform 

EC-131, "Work Procedure"

.

Do you have CONSULT?

YES

>> GO TO 7.

NO

>> GO TO 9.

7.

PERFORM SPEC IN DATA MONITOR MODE

With CONSULT

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

SULT in “SPEC” of “DATA MONITOR” mode. Refer to 

EC-157, "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-158, "Diagnosis Procedure"

.

Is malfunctioning part detected?

YES

>> GO TO 11.

NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE

Detect malfunctioning system according to 

EC-473, "Symptom Table"

 based on the confirmed symptom in

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

>> 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 Circuit Inspection in 

GI-

42, "Circuit Inspection"

.

Is malfunctioning part detected?

YES

>> GO TO 11.

NO

>> Monitor input data from related sensors or check the voltage of related ECM terminals using CON-

SULT. Refer to 

EC-77, "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 the following.

With CONSULT: “How to Erase DTC and 1st Trip DTC” in 

EC-66, "CONSULT Function"

.

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

EC-63, "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.

DIAGNOSIS AND REPAIR WORKFLOW

EC-129

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YES-2 >> Symptom remains: GO TO 6.

NO-1 >> No request for I/M examination from the customer: Before returning the vehicle to the customer,

always erase unnecessary DTC in ECM and TCM ( With CONSULT: Refer to “How to Erase
DTC and 1st Trip DTC” in 

EC-66, "CONSULT Function"

,  Without CONSULT: Refer to “How to

Erase Self-diagnostic Results” in 

EC-63, "On Board Diagnosis Function"

). If the completion of

SRT is needed, drive vehicle under the specific driving pattern. Refer to 

EC-146, "SRT Set Driving

Pattern"

.

NO-2 >> I/M examination, requested from the customer: GO TO 13.

13.

PREPARE FOR I/M EXAMINATION

1. Set SRT codes. Refer to 

EC-145, "Description"

.

2. Erase permanent DTCs. Refer to 

EC-151, "Description"

.

>> INSPECTION END

Diagnostic Work Sheet

INFOID:0000000009758397

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 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.

SEF907L

EC-130

< BASIC INSPECTION >

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DIAGNOSIS AND REPAIR WORKFLOW

WORKSHEET SAMPLE

MTBL0017

BASIC INSPECTION

EC-131

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BASIC INSPECTION

Work Procedure

INFOID:0000000009758398

1.

INSPECTION START

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for

scheduled maintenance.

2. Open engine hood and check the following:

-

Harness connectors for improper connections

-

Wiring harness for improper connections, pinches and cut

-

Vacuum hoses for splits, kinks and improper connections

-

Hoses and ducts for leaks

-

Air cleaner clogging

-

Gasket

3. Confirm that electrical or mechanical loads are not applied.

-

Headlamp switch is OFF.

-

Air conditioner switch is OFF.

-

Rear window defogger switch is OFF.

-

Steering wheel is in the straight-ahead position, etc.

4. Start engine and warm it up until engine coolant temperature

indicator points the middle of gauge.

Ensure engine stays below 1,000 rpm.

5. Run engine at about 2,000 rpm for about 2 minutes under no

load.

6. Make sure that no DTC is displayed with CONSULT or GST.
Is any DTC detected?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding Diagnostic Procedure.

>> GO TO 3.

3.

CHECK TARGET IDLE SPEED

1. Run engine at about 2,000 rpm for about 2 minutes under no load.

SEF983U

SEF976U

SEF977U