2004 INFINITI QX56 Factory Service Manual

Page 1433 of 3371

INFINITI QX56 2004  Factory Service Manual EC-242Revision: August 2007
DTC P0222, P0223 TP SENSOR
2004 QX56
Component InspectionUBS00H3O
THROTTLE POSITION SENSOR
1. Reconnect all harness connectors disconnected.
2. Perform EC-44, "
Throttle Va

Page 1434 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
EC-243
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDE

Page 1435 of 3371

INFINITI QX56 2004  Factory Service Manual EC-244Revision: August 2007
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2004 QX56
 WITH CONSULT-II
1. Turn ignition switch ON, and select “DATA MONITOR” mode
with CON

Page 1436 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
EC-245
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
3. PERFORM POWER BALANCE TEST
 With CONSULT-II
1. Perform “P

Page 1437 of 3371

INFINITI QX56 2004  Factory Service Manual EC-246Revision: August 2007
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2004 QX56
5. CHECK IGNITION SPARK
1. Turn ignition switch OFF.
2. Remove ignition coil assembly fr

Page 1438 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
EC-247
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
8. CHECK FUEL PRESSURE
1. Install all removed parts.
2. Releas

Page 1439 of 3371

INFINITI QX56 2004  Factory Service Manual EC-248Revision: August 2007
DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
2004 QX56
11 .  CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch

Page 1440 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0300 - P0308 MULTIPLE CYLINDER MISFIRE, NO. 1 - 8 CYLINDER MIS-
FIRE
EC-249
C
D
E
F
G
H
I
J
K
L
MA
EC
Revision: August 20072004 QX56
13. CHECK MASS AIR FLOW SENSOR
 With CONSULT-II
Check mass air