Nissan Frontier D22. Manual — part 437
DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER MIS-
FIRE
EC-851
[VG33E]
C
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A
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
SEF070Y
LEC809
MEC703B
DTC P0300 - P0306 MULTIPLE CYLINDER MISFIRE, NO. 1 - 6 CYLINDER MIS-
FIRE
EC-853
[VG33E]
C
D
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A
EC
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
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
.
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
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
.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
●
Fuel pump and circuit (Refer to
●
Fuel pressure regulator (Refer to
.)
●
.)
●
Fuel filter for clogging
>> Repair or replace.
11.
CHECK IGNITION TIMING
Check the following items. Refer to
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)
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