Nissan Frontier. Manual - part 392

 

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Nissan Frontier. Manual - part 392

 

 

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-139

< DTC/CIRCUIT DIAGNOSIS >

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PBIB2318E

EC-140

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

DETAILED PROCEDURE

1.

CHECK “A/F ALPHA-B1”

1. Start engine.

2. Confirm that the testing conditions are met. Refer to 

EC-138, "Testing Condition"

.

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

the SP value.

NOTE:

PBIB3213E

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-141

< DTC/CIRCUIT DIAGNOSIS >

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Check “A/F ALPHA-B1” 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 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 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”

1. Stop the engine.

2. Disconnect PCV hose, and then plug it.

3. Start engine.

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

the SP value.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 6.

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-

ditions.

>> INSPECTION END

6.

CHECK FUEL PRESSURE

Check fuel pressure. (Refer to 

EC-466, "Fuel Pressure Check"

.)

OK or NG

OK

>> GO TO 9.

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

EC-466, "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-442, "Description"

.)

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

EC-466, "Fuel Pressure Check"

.)

If OK, replace fuel pressure regulator.

EC-142

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

>> GO TO 8.

8.

CHECK “A/F ALPHA-B1”

1. Start engine.

2. Select “A/F ALPHA-B1” in “DATA MONITOR (SPEC)” mode, and make sure that 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.

10.

DETECT MALFUNCTIONING PART

1. Check the following below.

-

Ignition coil and its circuit (Refer to 

EC-446, "Component Description"

.)

-

Fuel injector and its circuit (Refer to 

EC-439, "Component Description"

.)

-

Intake air leakage

-

Low compression pressure (Refer to 

EM-23, "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”

1. Start engine.

2. Select “A/F ALPHA-B1” in “DATA MONITOR (SPEC)” mode, and make sure that 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, refer to 

EC-197, "DTC Confirmation Procedure"

.

• For DTC P0131, refer to 

EC-201, "DTC Confirmation Procedure"

.

• For DTC P0132, refer to 

EC-204, "DTC Confirmation Procedure"

.

• For DTC P014C, refer to 

EC-223, "DTC Logic"

.

• For DTC P014D, refer to 

EC-223, "DTC Logic"

.

• For DTC P015A, refer to 

EC-223, "DTC Logic"

.

• For DTC P015B, refer to 

EC-223, "DTC Logic"

.

• For DTC P2096, refer to 

EC-402, "DTC Confirmation Procedure"

.

• For DTC P2097, refer to 

EC-402, "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”

 

 

 

 

 

 

 

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