2005 INFINITI QX4 Factory Service Manual

bolt pattern tire pressure warning lights service interval cooling climate control

Page 1465 of 3419

INFINITI QX4 2005 Factory Service Manual EC-274Revision: October 2005
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2005 QX56
5. CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Do the following procedure in the place w

EC-274Revision: October 2005
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2005 QX56
5. CHECK FUNCTION OF IGNITION COIL-I
CAUTION:
Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-II to release fuel pressure, or fuel pres-
sure applies again during the following procedure.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel
pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electri-
cal 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
between the edge of the spark plug and grounded metal portion
as shown in the figure.
11. Crank engine for about 3 seconds, and check whether spark is
generated between the spark plug and the grounded metal por-
tion.
CAUTION:
Do not approach to the spark plug and the ignition coil
within 50cm. Be careful not to get an electrical shock
while checking, because the electrical discharge voltage
becomes 20kV or more.
It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
NOTE:
When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
OK or NG
OK >> GO TO 9.
NG >> GO TO 6.
6. CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a known-good spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and
the grounded metal portion.
OK or NG
OK >> GO TO 7.
NG >> Check ignition coil, power transistor and their circuits. Refer to EC-619, "
IGNITION SIGNAL" . Spark should be generated.
BBIA0380E
PBIB2325E
Spark should be generated.

Page 1466 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
EC-275
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7. CHECK SPARK PLUG
Check the initial spark plug for fouling,

Page 1467 of 3419

INFINITI QX4 2005 Factory Service Manual EC-276Revision: October 2005
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2005 QX56
12. CHECK IGNITION TIMING
Check the following items. Refer to EC-72, "
Basic Inspection

Page 1468 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
EC-277
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Revision: October 20052005 QX56
13. CHECK A/F SENSOR 1 INPUT SIGNAL
1. Turn ignition switch

Page 1469 of 3419

INFINITI QX4 2005 Factory Service Manual EC-278Revision: October 2005
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2005 QX56
15. CHECK MASS AIR FLOW SENSOR
Check mass air flow sensor signal in “DATA MONITOR”

Page 1470 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0327, P0328, P0332, P0333 KS
EC-279
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Revision: October 20052005 QX56
DTC P0327, P0328, P0332, P0333 KSPFP:22060
Component DescriptionUBS00H3T
The knock sensor is attached

Page 1471 of 3419

INFINITI QX4 2005 Factory Service Manual EC-280Revision: October 2005
DTC P0327, P0328, P0332, P0333 KS
2005 QX56
Wiring DiagramUBS00H3W
BBWA1684E

Page 1472 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0327, P0328, P0332, P0333 KS
EC-281
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Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
D

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