2008 INFINITI QX56 Factory Service Manual

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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
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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

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 position because the conti
nuity of the line (the ON signal) exists.
Then the TCM sends the PNP signal to the ECM via combination meter.
On Board Diagn osis LogicINFOID:0000000001351690
DTC Confirmation ProcedureINFOID:0000000001351691
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode with CONSULT-III. Then check the “P/N POSI SW” sig-
nal under the following conditions.
If NG, go to EC-297, "
Diagnosis Procedure".
If OK, go to following step.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Start engine and warm it up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to EC-297, "
Diagnosis Procedure".
Overall Function CheckINFOID:0000000001351692
Use this procedure to check the overall function of t he park/neutral position (PNP) signal circuit. During this
check, a 1st trip DTC might not be confirmed.
WITH GST
1. Turn ignition switch ON.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0850
0850 Park/neutral position
switch The park/neutral position (PNP) signal is not
changed in the process of engine starting and
driving. • Harness or connectors
[The park/neutral position (PNP) signal
circuit is open or shorted.]
• Combination meter
•TCM
Position (Selector lever) Known-good signal
N or P position ON
Except the above position OFF
ENG SPEED1,000 - 6,375 rpm
COOLAN TEMP/S More than 70°C (158 °F)
B/FUEL SCHDL 2.0 - 31.8 msec
VHCL SPEED SE More than 64 km/h (40 MPH)
Selector lever Suitable position
Revision: March 2010 2008 QX56

Page 1596 of 4083

INFINITI QX56 2008 Factory Service Manual P0850 PNP SWITCHEC-297
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
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F
G H
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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
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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

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