Nissan Frontier D22. Manual - part 437

DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER MIS-

FIRE

EC-851

[VG33E]

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EC

 WITH CONSULT-II

1.

Turn ignition switch ON, and select “DATA MONITOR” mode
with CONSULT-II.

2.

Start engine and warm it up to normal operating temperature.

3.

Turn ignition switch OFF and wait at least 5 seconds.

4.

Start engine again and drive at 1,500 to 3,000 rpm for at least 3
minutes.
Hold the accelerator pedal as steady as possible.

NOTE:
Refer to the freeze frame data for the test driving condi-
tions.

5.

If 1st trip DTC is detected, go to 

EC-851, "Diagnostic Procedure"

.

NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain
time. Refer to the table below.
Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.

The time to driving varies according to the engine speed in the freeze frame data.

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Diagnostic Procedure

UBS00DJG

1. 

CHECK FOR INTAKE AIR LEAK

1.

Start engine and run it at idle speed.

2.

Listen for the sound of the intake air leak.

OK or NG

OK

>> GO TO 2.

NG

>> Discover air leak location and repair.

2. 

CHECK FOR EXHAUST SYSTEM CLOGGING

Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace it.

SEF213Y

Engine speed

Engine speed in the freeze frame data 

± 400 rpm

Vehicle speed

Vehicle speed in the freeze frame data 

± 10 km/h (6 MPH)

Engine coolant temperature 
(T) condition

When the freeze frame data shows lower than 70 

°C (158 °F),

T should be lower than 70 

°C (158 °F).

When the freeze frame data shows higher than or equal to 70 

°C (158 °F),

T should be higher than or equal to 70 

°C (158 °F).

Engine speed

Time

Around 1,000 rpm

Approximately 10 minutes

Around 2,000 rpm

Approximately 5 minutes

More than 3,000 rpm

Approximately 3.5 minutes

EC-852

[VG33E]

DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER MIS-

FIRE

3. 

PERFORM POWER BALANCE TEST

 With CONSULT-II

1.

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

2.

Is there any cylinder which does not produce a momentary
engine speed drop?

 Without CONSULT-II

When disconnecting each injector harness connector one at a time,
is there any cylinder which does not produce a momentary engine
speed drop?

Yes or No

Yes

>> GO TO 4.

No

>> GO TO 7.

4. 

CHECK INJECTOR

Does each injector make an operating sound at idle?

Yes or No

Yes

>> GO TO 5.

No

>> Check injector(s) and circuit(s). Refer to 

EC-1140,

"INJECTOR CIRCUIT"

 .

SEF070Y

LEC809

MEC703B

DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER MIS-

FIRE

EC-853

[VG33E]

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5. 

CHECK IGNITION SPARK

1.

Disconnect ignition wire from spark plug.

2.

Connect a known good spark plug to the ignition wire.

3.

Place end of spark plug against a suitable ground and crank engine.

4.

Check for spark.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

CHECK IGNITION WIRES

1.

Inspect wires for cracks, damage, burned terminals and for improper fit.

2.

Measure the resistance of wires to their distributor cap terminal.
Move each wire while testing to check for intermittent breaks.
Resistance:

If the resistance exceeds the above specification, inspect ignition wire to distributor cap connection. Clean
connection or replace the ignition wire with a new one.

OK or NG

OK

>> Check the following:

●

Distributor rotor head for incorrect parts

●

Ignition coil, power transistor and their circuits
Refer to 

EC-1134, "IGNITION SIGNAL"

 .

NG

>> Replace.

7. 

CHECK SPARK PLUGS

Remove the spark plugs and check for fouling, etc.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace spark plug(s) with standard type

one(s). For spark plug type, refer to 

MA-32, "Changing

Spark Plugs"

 .

SEF282G

Cylinder No.

Resistance k

Ω [at 25°C (77°F)]

1

Approx. 6.5

2

Approx. 10.0

3

Approx. 8.5

4

Approx. 12.5

5

Approx. 8.5

6

Approx. 11.0

SEF174P

SEF156I

EC-854

[VG33E]

DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER MIS-

FIRE

8. 

CHECK COMPRESSION PRESSURE

Refer to 

EM-102, "Measurement of Compression"

 .

●

Check compression pressure.

OK or NG

OK

>> GO TO 9.

NG

>> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

9. 

CHECK FUEL PRESSURE

1.

Install any parts removed.

2.

Release fuel pressure to zero.
Refer to 

EC-616, "FUEL PRESSURE RELEASE"

 .

3.

Install fuel pressure gauge and check fuel pressure. Refer to 

EC-617, "FUEL PRESSURE CHECK"

 .

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

10. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuel pump and circuit (Refer to 

EC-1149

 .)

●

Fuel pressure regulator (Refer to 

EC-617

 .)

●

Fuel lines (Refer to 

MA-28

 .)

●

Fuel filter for clogging

>> Repair or replace.

11. 

CHECK IGNITION TIMING

Check the following items. Refer to 

EC-646, "Basic Inspection"

 .

OK or NG

OK (With CONSULT-II)>>GO TO 12.
OK (Without CONSULT-II)>>GO TO 13.
NG

>> Adjust ignition timing.

Standard

: 1,196 kPa (12.2 kg/cm

2

 , 173 psi)/300 

rpm

Minimum

: 883 kPa (9.0 kg/cm

2

 , 128 psi)/300 rpm

Difference between each cylinder

: 98 kPa (1.0 kg/cm

2

 , 14 psi)/300 rpm

At idle: Approx. 235 kPa (2.4 kg/cm

2

 , 34 psi)

Items

Specifications

Ignitions timing

10 

± 5° BTDC

Base idle speed

700 

± 50 rpm (in P or N position)

Closed throttle position switch idle 
position adjustment

Feeler gauge thickness and switch 
condition
0.3 mm (0.012 in): ON
0.4 mm (0.016 in): OFF

Target idle speed

750 

± 50 rpm (in P or N position)