2008 INFINITI QX56 Factory Service Manual

Page 1593 of 4083

INFINITI QX56 2008  Factory Service Manual EC-294
< COMPONENT DIAGNOSIS >[VK56DE]
P0643 SENSOR POWER SUPPLY
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect accelerator pedal po

Page 1594 of 4083

INFINITI QX56 2008  Factory Service Manual P0643 SENSOR POWER SUPPLYEC-295
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
6.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal position assembly.
2. Perform  EC-18,

Page 1595 of 4083

INFINITI QX56 2008  Factory Service Manual EC-296
< COMPONENT DIAGNOSIS >[VK56DE]
P0850 PNP SWITCH
P0850 PNP SWITCH
Component DescriptionINFOID:0000000001351688
When the gear position is P or N, transmission range switch is ON.
TCM detects the

Page 1596 of 4083

INFINITI QX56 2008  Factory Service Manual P0850 PNP SWITCHEC-297
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
2. Check voltage between ECM terminal 102 (PNP signal) and
ground under the following conditions.
3. If NG, go t

Page 1597 of 4083

INFINITI QX56 2008  Factory Service Manual EC-298
< COMPONENT DIAGNOSIS >[VK56DE]
P0850 PNP SWITCH
NG >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Harness for open or short between ECM and

Page 1598 of 4083

INFINITI QX56 2008  Factory Service Manual P1140, P1145 IVT CONTROL POSITION SENSOR
EC-299
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P1140, P1145 IVT CONTROL POSITION SENSOR
Component DescriptionINFOID:0000000001351695
I

Page 1599 of 4083

INFINITI QX56 2008  Factory Service Manual EC-300
< COMPONENT DIAGNOSIS >[VK56DE]
P1140, P1145 IVT CONTROL POSITION SENSOR
Refer to EC-86, "Ground Inspection".
OK or NG
OK >> GO TO 2.
NG >> Repair or replace ground connections.
2.CHECK INTAKE

Page 1600 of 4083

INFINITI QX56 2008  Factory Service Manual P1140, P1145 IVT CONTROL POSITION SENSOR
EC-301
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
3. Also check harness for short to power. 
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DET