Infiniti QX56 (Z62). Manual — part 578
EC-290
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0222, P0223 TP SENSOR
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace electric throttle control actuator. Refer to
EM-30, "Removal and Installation"
>> INSPECTION END
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
EC-291
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MIS-
FIRE
DTC Logic
INFOID:0000000006217840
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 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 that a misfire condition occurs that can damage the three way catalyst (TWC) due to over-
heating, 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
light when the misfire is detected on a second trip. During this condition, the ECM monitors the CKP sen-
sor 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
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.
Sensor
Input signal to ECM
ECM function
Crankshaft position sensor
Engine speed
On board diagnosis of misfire
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P0300
MULTI CYL MISFIRE
(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
CYL 1 MISFIRE
(No.1 cylinder misfire detected)
No. 1 cylinder misfires.
P0302
CYL 2 MISFIRE
(No. 2 cylinder misfire detected)
No. 2 cylinder misfires.
P0303
CYL 3 MISFIRE
(No. 3 cylinder misfire detected)
No. 3 cylinder misfires.
P0304
CYL 4 MISFIRE
(No. 4 cylinder misfire detected)
No. 4 cylinder misfires.
P0305
CYL 5 MISFIRE
(No. 5 cylinder misfire detected)
No. 5 cylinder misfires.
P0306
CYL 6 MISFIRE
(No. 6 cylinder misfire detected)
No. 6 cylinder misfires.
P0307
CYL 7 MISFIRE
(No. 7 cylinder misfire detected)
No. 7 cylinder misfires.
P0308
CYL 8 MISFIRE
(No. 8 cylinder misfire detected)
No. 8 cylinder misfires.
EC-292
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
>> 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 about 15 minutes.
6.
Check 1st trip DTC.
Is 1st trip DTC detected?
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:0000000006217841
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
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)
Base fuel schedule
Base fuel schedule in the 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
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
EC-293
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.
Is the inspection result normal?
YES-1 >> With CONSULT-III: GO TO 3.
YES-2 >> Without CONSULT-III: GO TO 4.
NO
>> Repair or replace malfunctioning part.
3.
PERFORM POWER BALANCE TEST
WITH CONSULT-III
1.
Start engine.
2.
Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
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-I
1.
Start engine and let it idle.
2.
Listen to each fuel injector operation.
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 No. in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following pro-
cedure.
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:
• Never place the spark plug and the ignition coil within 50
cm (19.7 in) each other. 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:
Clicking sound should be heard.
PBIB3332E
Spark should be generated.
JMBIA0066GB
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