Nissan Frontier D22. Manual - part 288

DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

EC-255

[KA24DE]

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EC

6. 

CHECK IGNITION SPARK

1.

Turn ignition switch OFF.

2.

Disconnect ignition wire from spark plug.

3.

Connect a known good spark plug to the ignition wire.

4.

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

5.

Check for spark.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

CHECK IGNITION WIRES

Refer to 

EC-257, "Component Inspection"

 .

OK or NG

OK

>> Check distributor rotor head for incorrect parts. Check ignition coil, power transistor and their cir-

cuits. Refer to 

EC-532, "IGNITION SIGNAL"

 .

NG >> Replace.

8. 

CHECK SPARK PLUGS

Remove the spark plugs and check for fouling, etc.
OK or NG

OK

>> GO TO 9.

NG

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

one(s). For spark plug type, refer to “ENGINE MAINTE-
NANCE”, 

MA-15

 .

9. 

CHECK COMPRESSION PRESSURE

Check compression pressure.
Refer to 

EM-32, "CHECKING COMPRESSION PRESSURE"

 .

OK or NG

OK

>> GO TO 10.

NG

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

SEF282G

SEF156I

Standard

: 1,226 kPa (12.5 kg/cm

2

 , 178 psi)/300 rpm

Minimum

: 1,030 kPa (10.5 kg/cm

2

 , 149 psi)/300 rpm

Difference between 
each cylinder

: 98 kPa (1.0 kg/cm

2

 , 14 psi)/300 rpm

EC-256

[KA24DE]

DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

10. 

CHECK FUEL PRESSURE

1.

Install any parts removed.

2.

Release fuel pressure to zero. Refer to 

EC-46, "FUEL PRESSURE RELEASE"

 .

3.

Install fuel pressure gauge and check fuel pressure. Refer to

EC-47, "FUEL PRESSURE CHECK"

 .

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuel pump and circuit (Refer to 

EC-548, "FUEL PUMP CIRCUIT"

 .)

●

Fuel pressure regulator (Refer to 

EC-48, "Fuel Pressure Regulator Check"

 .)

●

Fuel lines (Refer to “Checking Fuel Lines”, 

MA-18

 ).

●

Fuel filter for clogging

>> Repair or replace.

12. 

CHECK IGNITION TIMING

1.

Check the following items. Refer to 

EC-74, "Basic Inspection"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Adjust ignition timing.

13. 

CHECK HEATED OXYGEN SENSOR 1

Refer to 

EC-257, "Component Inspection"

 .

OK or NG

OK

>> GO TO 14.

NG

>> Replace heated oxygen sensor 1.

At idle

: Approx. 235 kPa (2.4 kg/cm

2

 , 34 psi)

AEC064B

Items

Specifications

Ignition timing

20

° ± 2° BTDC

Base idle speed

750 

± 50 rpm (in P or N position)

Closed throttle position switch idle 
position adjustment

Feeler gauge thickness and switch condition
0.1 mm (0.004 in): ON
0.3 mm (0.012 in): OFF 

Target idle speed

800 

± 50 rpm (in P or N position)

DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

EC-257

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EC

14. 

CHECK MASS AIR FLOW SENSOR

 With CONSULT-II

Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.

 With GST

Check mass air flow sensor signal in MODE 1 with GST.

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15. 

CHECK CONNECTORS

Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or engine
grounds.
Refer to 

EC-143, "DTC P0102, P0103 MAF SENSOR"

 .

OK or NG

NG

>> Repair or replace it.

16. 

CHECK SYMPTOM MATRIX CHART

Check items on the rough idle symptom in “Symptom Matrix Chart”, 

EC-84

 .

OK or NG

OK

>> GO TO 17.

NG

>>  Repair or replace.

17. 

ERASE THE 1ST TRIP DTC

Some tests may cause a 1st trip DTC to be set.
Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to 

EC-61, "HOW TO ERASE

EMISSION-RELATED DIAGNOSTIC INFORMATION"

 .

>> GO TO 18.

18. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00D5W

IGNITION WIRES

1.

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

at idling

: 0.9 - 5.8 g·m/sec

at 2,500 rpm

: 7.5 - 13.2 g·m/sec

at idling

: 0.9 - 5.8 g·m/sec

at 2,500 rpm

: 7.5 - 13.2 g·m/sec

EC-258

[KA24DE]

DTC P0300 - P0304 NO. 4 - 1 CYLINDER MISFIRE, MULTIPLE CYLINDER MIS-

FIRE

2.

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

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

Removal and Installation

UBS00D5X

INJECTOR

Refer to 

EM-13, "OUTER COMPONENT PARTS"

 .

SPARK PLUGS

Refer to 

EM-13, "OUTER COMPONENT PARTS"

 .

Resistance

: 13.6 - 18.4 k

Ω/m (4.15 - 

5.61 k

Ω/ft) at 25°C (77°F)

SEF174P