Nissan Murano. Manual — part 539
EC-266
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
DTC Logic
INFOID:0000000009720000
DTC DETECTION LOGIC
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank-
shaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring.
The misfire detection logic consists of the following two conditions.
1.
One Trip Detection Logic (Three Way Catalyst Damage)
On the 1st trip, when a misfire condition occurs that can damage the three way catalyst (TWC) due to
overheating, the MIL will blink.
When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions
for a change.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.
If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.
When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.
If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.
2.
Two Trip Detection Logic (Exhaust quality deterioration)
For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only
illuminate when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP
sensor signal every 1,000 engine revolutions.
A misfire malfunction can be detected in any one cylinder or in multiple cylinders.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-I
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Restart engine and let it idle for approximately 15 minutes.
6.
Check 1st trip DTC.
Is 1st trip DTC detected?
Sensor
Input signal to ECM
ECM function
Crankshaft position sensor (POS)
Engine speed
On board diagnosis of misfire
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0300
Multiple cylinder misfires detected
Multiple cylinders misfire.
• Improper spark plug
• Insufficient compression
• Incorrect fuel pressure
• The fuel injector circuit is open or shorted
• Fuel injector
• Intake air leakage
• The ignition signal circuit is open or shorted
• Lack of fuel
• Signal plate
• A/F sensor 1
• Incorrect PCV hose connection
P0301
No. 1 cylinder misfire detected
No. 1 cylinder misfires.
P0302
No. 2 cylinder misfire detected
No. 2 cylinder misfires.
P0303
No. 3 cylinder misfire detected
No. 3 cylinder misfires.
P0304
No. 4 cylinder misfire detected
No. 4 cylinder misfires.
P0305
No. 5 cylinder misfire detected
No. 5 cylinder misfires.
P0306
No. 6 cylinder misfire detected
No. 6 cylinder misfires.
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
EC-267
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
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YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-II
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
4.
Start engine and drive the vehicle under 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.
Similar conditions to (1st trip) Freeze Frame Data mean that the following conditions should be satisfied at
the same time.
CAUTION:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when
driving.
Driving time varies according to the engine speed in the freeze frame data.
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009720001
1.
CHECK FOR INTAKE AIR LEAKAGE AND PCV HOSE
1.
Start engine and run it at idle speed.
2.
Listen for the sound of the intake air leakage.
3.
Check PCV hose connection.
Is intake air leakage detected?
YES
>> Discover air leakage location and repair.
NO
>> GO TO 2.
2.
CHECK FOR EXHAUST SYSTEM CLOGGING
Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.
Is the inspection result normal?
YES-1 >> With CONSULT: GO TO 3.
YES-2 >> Without CONSULT: GO TO 4.
NO
>> Repair or replace malfunctioning part.
3.
PERFORM POWER BALANCE TEST
With CONSULT
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
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)
Basic fuel schedule
Basic fuel schedule in freeze frame data
×
(1
±
0.1)
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-268
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
3.
Check that each circuit produces a momentary engine speed drop.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 4.
4.
CHECK FUNCTION OF FUEL INJECTOR
1.
Start engine and let it idle.
2.
Listen to each fuel injector make operation sound.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Perform trouble diagnosis for FUEL INJECTOR, refer to
.
5.
CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Perform the following procedure in a place with no combustible objects and good ventilation.
1.
Turn ignition switch OFF.
2.
Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following proce-
dure.
3.
Start engine.
4.
After engine stalls, crank it 2 or 3 times to release all fuel pressure.
5.
Turn ignition switch OFF.
6.
Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7.
Remove ignition coil and spark plug of the cylinder to be checked.
8.
Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9.
Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -
0.66 in) between the edge of the spark plug and grounded metal
portion as shown in the figure.
11. Crank engine for approximately 3 seconds, and check whether
spark is generated between the spark plug and the grounded
metal portion.
CAUTION:
• During the operation, always stay 0.5 m (19.7 in) or more
away from the spark plug and the ignition coil. Be careful
not to get an electrical shock while checking, because the
electrical discharge voltage becomes 20 kV or more.
• It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE:
When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunc-
tioning.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 6.
6.
CHECK FUNCTION OF IGNITION COIL-II
1.
Turn ignition switch OFF.
2.
Disconnect spark plug and connect a non-malfunctioning spark plug.
Clicking sound should be heard.
PBIB3332E
Spark should be generated.
JMBIA0066GB
P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE
EC-269
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
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EC
N
P
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3.
Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark
plug and the grounded metal portion.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Check ignition coil, power transistor and their circuits. Refer to
.
7.
CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
Is the inspection result normal?
YES
>> Replace spark plug(s) with standard type one(s). For
spark plug type, refer to
.
NO
>> Repair or clean spark plug. Then GO TO 8.
8.
CHECK FUNCTION OF IGNITION COIL-III
1.
Reconnect the initial spark plugs.
2.
Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark
plug and the grounded portion.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace spark plug(s) with standard type one(s). For spark plug type, refer to
.
9.
CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to
.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
10.
CHECK FUEL PRESSURE
1.
Install all removed parts.
2.
Release fuel pressure to zero. Refer to
3.
Install fuel pressure gauge kit [SST (J-44321)] and check fuel pressure. Refer to
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES
>> Replace “fuel filter and fuel pump assembly”. Refer to
.
NO
>> Repair or replace malfunctioning part.
12.
CHECK IGNITION TIMING
Check idle speed and ignition timing.
For procedure, refer to
EC-13, "BASIC INSPECTION : Special Repair Requirement"
Spark should be generated.
SEF156I
Spark should be generated.
At idle: Approximately 350 kPa (3.57 kg/cm
2
, 51 psi)
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