Nissan Maxima. Manual - part 381

EC-8

PRECAUTION ............................................

586

PRECAUTIONS  ...............................................

586

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................

586

On Board Diagnostic (OBD) System of Engine 
and CVT  ................................................................

586

General Precautions ..............................................

587

PREPARATION ..........................................

590

PREPARATION  ...............................................

590

Special Service Tools  ............................................

590

Commercial Service Tools .....................................

590

PERIODIC MAINTENANCE .......................

592

FUEL PRESSURE ............................................

592

Inspection ..............................................................

592

EVAP LEAK CHECK ........................................

594

Inspection ..............................................................

594

SERVICE DATA AND SPECIFICATIONS 
(SDS) .........................................................

596

SERVICE DATA AND SPECIFICATIONS 
(SDS) ................................................................

596

Idle Speed .............................................................

596

Ignition Timing .......................................................

596

Calculated Load Value ..........................................

596

Mass Air Flow Sensor  ...........................................

596

DIAGNOSIS AND REPAIR WORK FLOW

EC-9

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

INFOID:0000000010094770

OVERALL SEQUENCE

DETAILED FLOW

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DIAGNOSIS AND REPAIR WORK FLOW

1.

GET INFORMATION FOR SYMPTOM

1. 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-12, "Diagnostic

Work Sheet"

.)

2. Ask if the customer requests I/M examination.

Malfunction information, obtained>>GO TO 2.

No malfunction information, but a request for I/M examination>>GO TO 13.

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 or GST.)

-

Erase DTC. (Refer to 

EC-135, "On Board Diagnosis Function"

 or 

EC-138, "CONSULT Function"

.)

-

Study the relationship between the cause detected by DTC and the symptom described by the customer.

(Symptom Table is useful. Refer to 

EC-581, "Symptom Table"

.)

3. Check related service bulletins for information.
Are any symptoms described and any DTCs detected?

Symptom is described, DTC is displayed>>GO TO 3.

Symptom is described, DTC is not displayed>>GO TO 4.

Symptom is not described, DTC is displayed>>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-585, "Description"

 and 

EC-

538, "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-585, "Description"

 and 

EC-

538, "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-540, "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

Perform 

EC-14, "BASIC INSPECTION : Special Repair Requirement"

.

DIAGNOSIS AND REPAIR WORK FLOW

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Will CONSULT be used?

YES

>> GO TO 7.

NO

>> GO TO 9.

7.

PERFORM “SPEC” OF “DATA MONITOR” MODE

 With CONSULT

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

EC-149, "Component Function

Check"

.

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-150, "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-581, "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 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-

44, "Circuit Inspection"

.

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 

EC-522, "Reference Value"

.

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-135, "On Board Diagnosis Function"

 or 

EC-138,

"CONSULT Function"

.

>> GO TO 12.

12.

FINAL CHECK

When DTC was detected in step 2, perform DTC Confirmation Procedure or Overall 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-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 (Transmission Control Module). Refer to 

EC-

135, "On Board Diagnosis Function"

 or 

EC-138, "CONSULT Function"

.

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