Content .. 240 241 242 243 ..

Nissan Pathfinder (2012 year). Manual - part 242

DIAGNOSIS AND REPAIR WORKFLOW

EC-17

< BASIC INSPECTION >

[VQ40DE]

PERFORM SPEC IN DATA MONITOR MODE

With CONSULT

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

B2” are within the SP value using CONSULT “SPEC” in “DATA MONITOR” mode. Refer to

EC-86, "Inspection

Procedure"

Is the measurement value within the SP value?

YES

>> GO TO 9.

>> GO TO 8.

DETECT MALFUNCTIONING PART BY TROUBLE DIAGNOSIS - SPECIFICATION VALUE

Detect malfunctioning part according to

EC-86, "Diagnosis Procedure"

Is a malfunctioning part detected?

YES

>> GO TO 11.

>> GO TO 9.

DETECT MALFUNCTIONING SYSTEM BY SYMPTOM TABLE

Detect malfunctioning system according to

EC-475, "Symptom Matrix Chart"

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-33, "Work Flow"

Is a malfunctioning part detected?

YES

>> GO TO 11.

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

SULT. Refer to

EC-433, "ECM Terminal and Reference Value"

EC-430, "CONSULT 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 Diagnosis Procedure again after repair and replace-

ment.

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

EC-74, "On Board Diagnosis Function"

(Without CON-

SULT) or

EC-77, "CONSULT Function"

(With CONSULT).

>> 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 completely repaired.

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 >> 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-

74, "On Board Diagnosis Function"

(Without CONSULT) or

EC-77, "CONSULT Function"

and

TM-

37, "CONSULT Function (TRANSMISSION)"

(With CONSULT).

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-28, "Description"

August 2012

2012 Pathfinder

EC-18

< BASIC INSPECTION >

[VQ40DE]

DIAGNOSIS AND REPAIR WORKFLOW

2. Erase permanent DTCs. Refer to

EC-34, "Description"

>> INSPECTION END

DIAGNOSTIC WORKSHEET

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 one on the next page 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.

SEF907L

August 2012

2012 Pathfinder

DIAGNOSIS AND REPAIR WORKFLOW

EC-19

< BASIC INSPECTION >

[VQ40DE]

Worksheet Sample

LEC031A

August 2012

2012 Pathfinder

EC-20

< BASIC INSPECTION >

[VQ40DE]

INSPECTION AND ADJUSTMENT

INSPECTION AND ADJUSTMENT

Basic Inspection

INFOID:0000000007357943

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 leakage

Air cleaner clogging

Gasket

3. Check 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 to 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.
OK or NG

>> GO TO 3.

>> GO TO 2.

REPAIR OR REPLACE

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

>> GO TO 3.

CHECK TARGET IDLE SPEED

With CONSULT

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

SEF983U

SEF976U

SEF977U

August 2012

2012 Pathfinder

INSPECTION AND ADJUSTMENT

EC-21

< BASIC INSPECTION >

[VQ40DE]

2. Rev engine (2,000 to 3,000 rpm) two or three times under no

load, then run engine at idle speed for about 1 minute.

3. Read idle speed in “DATA MONITOR” mode with CONSULT.

Refer to

EC-24, "Idle Speed and Ignition Timing Check"

Without CONSULT

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

2. Rev engine (2,000 to 3,000 rpm) two or three times under no load, then run engine at idle speed for about

1 minute.

3. Check idle speed. Refer to

EC-24, "Idle Speed and Ignition Timing Check"

OK or NG

>> GO TO 10.

>> GO TO 4.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

1. Stop engine.

2. Perform

EC-25, "Accelerator Pedal Released Position Learning"

>> GO TO 5.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform

EC-25, "Throttle Valve Closed Position Learning"

>> GO TO 6.

PERFORM IDLE AIR VOLUME LEARNING

Refer to

EC-25, "Idle Air Volume Learning"

Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes

>> GO TO 7.

>> 1. Follow the instruction of Idle Air Volume Learning.

2. GO TO 4.

CHECK TARGET IDLE SPEED AGAIN

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Read idle speed in “DATA MONITOR” mode with CONSULT.

Refer to

EC-24, "Idle Speed and Ignition Timing Check"

Without CONSULT

1. Start engine and warm it up to normal operating temperature.

PBIA8513J

625

50 rpm (in P or N position)

625

50 rpm (in P or N position)

625

50 rpm (in P or N position)

August 2012

2012 Pathfinder

EC-22

< BASIC INSPECTION >

[VQ40DE]

INSPECTION AND ADJUSTMENT

2. Check idle speed.

Refer to

EC-24, "Idle Speed and Ignition Timing Check"

OK or NG

>> GO TO 10.

>> GO TO 8.

DETECT MALFUNCTIONING PART

Check the following.

• Check camshaft position sensor (PHASE) and circuit. Refer to

EC-224, "Diagnosis Procedure"

• Check crankshaft position sensor (POS) and circuit. Refer to

EC-219, "Diagnosis Procedure"

OK or NG

>> GO TO 9.

>> 1. Repair or replace.

2. GO TO 4.

CHECK ECM FUNCTION

1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,

although this is rare.)

2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to

SEC-10, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

(with Intelligent Key system) or

SEC-120, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT

: Special Repair Requirement"

(without Intelligent Key system).

>> GO TO 4.

10.

CHECK IGNITION TIMING

1. Run engine at idle.

2. Check ignition timing with a timing light.

Refer to

EC-24, "Idle Speed and Ignition Timing Check"

OK or NG

>> GO TO 19.

>> GO TO 11.

11.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

1. Stop engine.

2. Perform

EC-25, "Accelerator Pedal Released Position Learning"

>> GO TO 12.

12.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform

EC-25, "Throttle Valve Closed Position Learning"

>> GO TO 13.

13.

PERFORM IDLE AIR VOLUME LEARNING

Refer to

EC-25, "Idle Air Volume Learning"

Is Idle Air Volume Learning carried out successfully?

Yes or No

625

50 rpm (in P or N position)

BTDC (in P or N position)

BBIA0531E

August 2012

2012 Pathfinder

INSPECTION AND ADJUSTMENT

EC-23

< BASIC INSPECTION >

[VQ40DE]

Yes

>> GO TO 14.

>> 1. Follow the instruction of Idle Air Volume Learning.

2. GO TO 4.

14.

CHECK TARGET IDLE SPEED AGAIN

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Read idle speed in “DATA MONITOR” mode with CONSULT.

Refer to

EC-24, "Idle Speed and Ignition Timing Check"

Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Check idle speed. Refer to

EC-24, "Idle Speed and Ignition Timing Check"

OK or NG

>> GO TO 15.

>> GO TO 17.

15.

CHECK IGNITION TIMING AGAIN

1. Run engine at idle.

2. Check ignition timing with a timing light.

Refer to

EC-24, "Idle Speed and Ignition Timing Check"

OK or NG

>> GO TO 19.

>> GO TO 16.

16.

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to

EM-61, "Removal and Installation"

OK or NG

>> GO TO 17.

>> 1. Repair the timing chain installation.

2. GO TO 4.

17.

DETECT MALFUNCTIONING PART

Check the following.

• Check camshaft position sensor (PHASE) and circuit. Refer to

EC-224, "Diagnosis Procedure"

• Check crankshaft position sensor (POS) and circuit. Refer to

EC-219, "Diagnosis Procedure"

OK or NG

>> GO TO 18.

>> 1. Repair or replace.

2. GO TO 4.

18.

CHECK ECM FUNCTION

1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident,

although this is rare.)

2. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to

SEC-10, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

(with Intelligent Key system) or

SEC-120, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT

: Special Repair Requirement"

(without Intelligent Key system).

625

50 rpm (in P or N position)

625

50 rpm (in P or N position)

BTDC (in P or N position)

BBIA0531E

August 2012

2012 Pathfinder

EC-24

< BASIC INSPECTION >

[VQ40DE]

INSPECTION AND ADJUSTMENT

>> GO TO 4.

19.

INSPECTION END

Did you replace the ECM, referring this Basic Inspection Procedure?
Yes or No

Yes

>> 1. Perform

EC-25, "VIN Registration"

INSPECTION END

Idle Speed and Ignition Timing Check

INFOID:0000000007357944

IDLE SPEED

With CONSULT

Check idle speed in “DATA MONITOR” mode with CONSULT.

With GST

Check idle speed with GST.

IGNITION TIMING

1. Attach timing light to loop wire as shown.

2. Check ignition timing.

Procedure After Replacing ECM

INFOID:0000000007357945

When replacing ECM, the following procedure must be performed.
1. Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to

SEC-10, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Requirement"

(with Intelligent Key system) or

SEC-120, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT

: Special Repair Requirement"

(without Intelligent Key system).

2. Perform

EC-25, "VIN Registration"

3. Perform

EC-25, "Accelerator Pedal Released Position Learning"

4. Perform

EC-25, "Throttle Valve Closed Position Learning"

5. Perform

EC-25, "Idle Air Volume Learning"

BBIA0530E

BBIA0531E

August 2012

2012 Pathfinder

Content .. 240 241 242 243 ..