Infiniti Q45. Manual - part 375

 

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Infiniti Q45. Manual - part 375

 

 

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-139

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5. 

CHANGE ENGINE OIL

1.

Stop the engine.

2.

Change engine oil.

NOTE:
This symptom may occur when a large amount of gasoline is mixed with engine oil because of driving
conditions (such as when engine oil temperature does not rise enough since a journey distance is too
short during winter). The symptom will not be detected after changing engine oil or changing driving con-
dition.

>> INSPECTION END

6. 

CHECK FUEL PRESSURE

Check fuel pressure. (Refer to 

EC-80, "Fuel Pressure Check"

 .)

OK or NG

OK

>> GO TO 9.

NG (Fuel pressure is too high)>>Replace  fuel  pressure  regulator,  refer  to 

EC-80, "FUEL PRESSURE

CHECK"

 . GO TO 8.

NG (Fuel pressure is too low)>>GO TO 7.

7. 

DETECT MALFUNCTIONING PART

1.

Check the following.

Clogged and bent fuel hose and fuel tube

Clogged fuel filter

Fuel pump and its circuit (Refer to 

EC-715, "FUEL PUMP"

 .)

2.

If NG, repair or replace the malfunctioning part. (Refer to 

EC-80, "FUEL PRESSURE CHECK"

 .)

If OK, replace fuel pressure regulator.

>> GO TO 8.

8. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 9.

9. 

PERFORM POWER BALANCE TEST

1.

Perform “POWER BALANCE” in “ACTIVE TEST” mode.

2.

Make sure that the each cylinder produces a momentary engine
speed drop.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 10.

PBIB0133E

EC-140

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

10. 

DETECT MALFUNCTIONING PART

1.

Check the following.

Ignition coil and its circuit (Refer to 

EC-731, "IGNITION SIGNAL"

 .)

Fuel injector and its circuit (Refer to 

EC-706, "FUEL INJECTOR"

 .)

Intake air leakage

Low compression pressure (Refer to 

EM-67, "CHECKING COMPRESSION PRESSURE"

 .)

2.

If NG, repair or replace the malfunctioning part.
If OK, replace fuel injector. (It may be caused by leakage from fuel injector or clogging.)

>> GO TO 11.

11. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 12.

12. 

CHECK A/F SENSOR 1 FUNCTION

Perform all DTC Confirmation Procedure related with A/F sensor 1.

For DTC P0130, P0150, refer to 

EC-236, "DTC Confirmation Procedure"

 .

For DTC P0131, P0151, refer to 

EC-246, "DTC Confirmation Procedure"

 .

For DTC P0132, P0152, refer to 

EC-255, "DTC Confirmation Procedure"

 .

For DTC P0133, P0153, refer to 

EC-265, "DTC Confirmation Procedure"

 .

For DTC P2A00, P2A03, refer to 

EC-676, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 13.

13. 

CHECK A/F SENSOR 1 CIRCUIT

Perform Diagnostic Procedure according to corresponding DTC.

>> GO TO 14.

14. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 15.

15. 

DISCONNECT AND RECONNECT ECM HARNESS CONNECTOR

1.

Stop the engine.

2.

Disconnect ECM harness connector. Check pin terminal and connector for damage, and then reconnect it.

>> GO TO 16.

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-141

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16. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG

>> Detect malfunctioning part according to 

EC-91, "Symptom Matrix Chart"

 .

17. 

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.
OK or NG

OK

>> INSPECTION END

NG (More than the SP value)>>GO TO 18.
NG (Less than the SP value)>>GO TO 25.

18. 

DETECT MALFUNCTIONING PART

1.

Check for the cause of large engine friction. Refer to the following.

Engine oil level is too high

Engine oil viscosity

Belt tension of power steering, alternator, A/C compressor, etc. is excessive

Noise from engine

Noise from transmission, etc.

2.

Check for the cause of insufficient combustion. Refer to the following.

Valve clearance malfunction

Intake valve timing control function malfunction

Camshaft sprocket installation malfunction, etc.

>> Repair or replace malfunctioning part, and then GO TO 30.

19. 

CHECK INTAKE SYSTEM

Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.

Crushed air ducts

Malfunctioning seal of air cleaner element

Uneven dirt of air cleaner element

Improper specification of intake air system

OK or NG

OK

>> GO TO 21.

NG

>> Repair or replace malfunctioning part, and then GO TO 20.

PBIB2332E

EC-142

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

20. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”

Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “DATA MONITOR (SPEC)” mode, and
make sure that the each indication is within the SP value.

OK or NG

OK

>> INSPECTION END

NG (“B/FUEL SCHDL” is more, “A/F ALPHA-B1”, “A/F ALPHA-B2” are less than the SP value)>>GO TO 21.

21. 

DISCONNECT AND RECONNECT MASS AIR FLOW SENSOR HARNESS CONNECTOR

1.

Stop the engine.

2.

Disconnect mass air flow sensor harness connector. Check pin terminal and connector for damage and
then reconnect it again.

>> GO TO 22.

22. 

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Select “A/F ALPHA-B1”, “A/F ALPHA-B2” in “DATA MONITOR (SPEC)” mode, and make sure that the
each indication is within the SP value.

OK or NG

OK

>> 1. Detect malfunctioning part of mass air flow sensor circuit and repair it. Refer to 

EC-204, "DTC

P0102, P0103 MAF SENSOR"

 .

2. GO TO 29.

NG

>> GO TO 23.

23. 

CHECK “MAS A/F SE-B1”

Select “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode, and
make sure that the indication is within the SP value.

OK or NG

OK

>> GO TO 24.

NG (More than the SP value)>>Replace mass air flow sensor, and

then GO TO 29.

24. 

REPLACE ECM

1.

Replace ECM.

2.

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

BL-202, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-77, "VIN Registration"

 .

4.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-78, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-78, "Idle Air Volume Learning"

 .

>> GO TO 29.

PBIB2370E

 

 

 

 

 

 

 

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