Infiniti M35/M45 Y50. Manual — part 418

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-145

[VQ35DE]

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PBIB3214E

EC-146

[VQ35DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

DETAILED PROCEDURE

1.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Start engine.

2.

Confirm that the testing conditions are met. Refer to

EC-143, "Testing Condition"

.

3.

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.

NOTE:
Check “A/F ALPHA-B1”, “A/F ALPHA-B2” for approximately 1
minute because they may fluctuate. It is NG if the indication is
out of the SP value even a little.

OK or NG

OK

>> GO TO 17.

NG (Less than the SP value)>>GO TO 2.
NG (More than the SP value)>>GO TO 3.

2.

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

>> GO TO 4.

NG (More than the SP value)>>GO TO 19.

3.

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

>> GO TO 6.

NG (More than the SP value)>>GO TO 6.
NG (Less than the SP value)>>GO TO 25.

4.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”

1.

Stop the engine.

2.

Disconnect PCV hose, and then plug it.

3.

Start engine.

4.

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

>> GO TO 5.

NG

>> GO TO 6.

PBIB2369E

PBIB2332E

PBIB2332E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-147

[VQ35DE]

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EC

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-88, "Fuel Pressure Check"

.)

OK or NG

OK

>> GO TO 9.

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

EC-89, "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-675, "FUEL PUMP"

.)

2.

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

EC-89, "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-148

[VQ35DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

10.

DETECT MALFUNCTIONING PART

1.

Check the following.

–

Ignition coil and its circuit (Refer to

EC-691, "IGNITION SIGNAL"

.)

–

Fuel injector and its circuit (Refer to

EC-669, "FUEL INJECTOR"

.)

–

Intake air leakage

–

Low compression pressure (Refer to

EM-102, "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-234, "DTC Confirmation Procedure"

.

●

For DTC P0131, P0151, refer to

EC-244, "DTC Confirmation Procedure"

.

●

For DTC P0132, P0152, refer to

EC-253, "DTC Confirmation Procedure"

.

●

For DTC P0133, P0153, refer to

EC-263, "DTC Confirmation Procedure"

.

●

For DTC P2A00, P2A03, refer to

EC-646, "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.