2008 INFINITI QX56 Factory Service Manual

Page 1609 of 4083

INFINITI QX56 2008  Factory Service Manual EC-310
< COMPONENT DIAGNOSIS >[VK56DE]
P1225 TP SENSOR
P1225 TP SENSOR
Component DescriptionINFOID:0000000001351876
Electric throttle control actuator consists of throttle control motor,
throttle posi

Page 1610 of 4083

INFINITI QX56 2008  Factory Service Manual P1225 TP SENSOREC-311
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
2.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform  EC-18

Page 1611 of 4083

INFINITI QX56 2008  Factory Service Manual EC-312
< COMPONENT DIAGNOSIS >[VK56DE]
P1226 TP SENSOR
P1226 TP SENSOR
Component DescriptionINFOID:0000000001351881
Electric throttle control actuator consists of throttle control motor,
throttle posi

Page 1612 of 4083

INFINITI QX56 2008  Factory Service Manual P1226 TP SENSOREC-313
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
3. Check if foreign matter is caught between the throttle valve and
the housing.
OK or NG
OK >> GO TO 2.
NG >> Re

Page 1613 of 4083

INFINITI QX56 2008  Factory Service Manual EC-314
< COMPONENT DIAGNOSIS >[VK56DE]
P1421 COLD START CONTROL
P1421 COLD START CONTROL
DescriptionINFOID:0000000001351886
ECM controls ignition timing and engine idle speed when engine is started wi

Page 1614 of 4083

INFINITI QX56 2008  Factory Service Manual P1421 COLD START CONTROLEC-315
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Perform 
EC-176, "DTC Confirmation Procedure" in DTC P0171, P0174 FUEL  INJECTION SYSTEM FUNC-
TION.
OK

Page 1615 of 4083

INFINITI QX56 2008  Factory Service Manual EC-316
< COMPONENT DIAGNOSIS >[VK56DE]
P1550 BATTERY CURRENT SENSOR
P1550 BATTERY CURRENT SENSOR
Component DescriptionINFOID:0000000001351890
The power generation voltage variable control enables fuel

Page 1616 of 4083

INFINITI QX56 2008  Factory Service Manual P1550 BATTERY CURRENT SENSOREC-317
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Refer to 
EC-86, "Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connect