2011 INFINITI QX56 Ignition coil

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Page 2218 of 5598

INFINITI QX56 2011  Factory Service Manual 
EC-194
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0075, P0081 IVT CONTROL SOLENOID VALVE
2. Disconnect ECM harness connector.
3. Check the continuity between IVT control sol
enoid valve harness connector and

Page 2317 of 5598

INFINITI QX56 2011  Factory Service Manual 
P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 MISFIRE
EC-293
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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G H
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EC
NP
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Stop engine and visually check exhaust tube, three way

Page 2318 of 5598

INFINITI QX56 2011  Factory Service Manual 
EC-294
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0300, P0301, P0302, P
0303, P0304, P0305, P0306,  P0307, P0308 MISFIRE
When the gap is less than 13 mm (0.52 in), a spark  might be generated even if the coi

Page 2333 of 5598

INFINITI QX56 2011  Factory Service Manual 
P0420, P0430 THREE WAY CATALYST FUNCTIONEC-309
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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G H
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M A
EC
NP
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Diagnosis ProcedureINFOID:0000000006217853
1.CHECK EXHAUST SYSTEM
Visually check exha

Page 2334 of 5598

INFINITI QX56 2011  Factory Service Manual 
EC-310
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
P0420, P0430 THREE 
WAY CATALYST FUNCTION
6. Remove all ignition coil harness connectors to avoi d the electrical discharge from the ignition coils.
7. Remove

Page 2335 of 5598

INFINITI QX56 2011  Factory Service Manual 
P0420, P0430 THREE WAY CATALYST FUNCTIONEC-311
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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G H
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EC
NP
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NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to

Page 2530 of 5598

INFINITI QX56 2011  Factory Service Manual 
EC-506
< DTC/CIRCUIT DIAGNOSIS >[VK56VD]
IGNITION SIGNAL
IGNITION SIGNAL
Component Function CheckINFOID:0000000006218011
1.INSPECTION START
Turn ignition switch OFF, and restart engine.
Does the engi

Page 2531 of 5598

INFINITI QX56 2011  Factory Service Manual 
IGNITION SIGNALEC-507
< DTC/CIRCUIT DIAGNOSIS > [VK56VD]
C
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Is the inspection result normal?
YES >> GO TO 2.
NO >> Go to 
EC-168, "
Diagnosis Procedure".
2.CHECK IGNITION