Infiniti FX35, FX50 (S51). Manual - part 856

P0643 SENSOR POWER SUPPLY

EC-965

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

C

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EC

N

P

O

P0643 SENSOR POWER SUPPLY

DTC Logic

INFOID:0000000005237438

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-965, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005237439

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect accelerator pedal position (APP) sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between APP sensor harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0643

Sensor power supply 
circuit short

ECM detects that the voltage 
of power source for sensor is 
excessively low or high.

• Harness or connectors

(Accelerator pedal position sensor 1 circuit is shorted.)
[Camshaft position sensor (bank 2) circuit is shorted.]
[Exhaust valve timing control position sensor (bank 2) circuit 
is shorted.]
(Power steering pressure sensor circuit is shorted.)
(Refrigerant pressure sensor circuit is shorted.)
(Throttle position sensor circuit is shorted.)

• Accelerator pedal position sensor
• Camshaft position sensor (bank 2)
• Exhaust valve timing control position sensor (bank 2)
• Power steering pressure sensor
• Refrigerant pressure sensor
• Throttle position sensor

EC-966

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P0643 SENSOR POWER SUPPLY

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 3.

3.

CHECK SENSOR POWER SUPPLY CIRCUIT

Check harness for short to power and short to ground, between the following terminals.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair short to ground or short to power in harness or connectors.

4.

CHECK COMPONENTS

Check the following.
• Camshaft position sensor (bank 2) (Refer to 

EC-881, "Component Inspection"

.)

• Exhaust valve timing control position sensor (bank 2) (Refer to 

EC-978, "Component Inspection"

.)

• Power steering pressure sensor (Refer to 

EC-958, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

EC-1127, "Diagnosis Procedure"

.)

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning component.

5.

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-1017, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 6.

6.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace electric throttle control actuator.

2.

Go to 

EC-1017, "Special Repair Requirement"

.

>> INSPECTION END

7.

CHECK ACCELERATOR PEDAL POSITION SENSOR

Refer to 

EC-1076, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

APP sensor

Ground

Voltage (V)

Connector

Terminal

E112 (Without ICC)

5

Ground

Approx. 5

E116 (With ICC)

5

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F111

84

Electric throttle control actuator (bank 1)

F66

2

88

Camshaft position sensor (bank 2)

F83

1

88

EVT control position sensor (bank 2)

F63

1

92

Power steering pressure sensor

F35

3

92

Refrigerant pressure sensor

E77

3

M160

96

Electric throttle control actuator (bank 2)

F64

2

99

APP sensor (Without ICC)

E112

5

99

APP sensor (With ICC)

E116

5

P0643 SENSOR POWER SUPPLY

EC-967

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

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EC

N

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8.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Go to 

EC-1077, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

EC-968

< DTC/CIRCUIT DIAGNOSIS >

[VK50VE]

P0850 PNP SWITCH

P0850 PNP SWITCH

Description

INFOID:0000000005237440

When the selector lever position is P or N, park/neutral position (PNP) signal is sent to ECM from TCM.

DTC Logic

INFOID:0000000005237441

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

INSPECTION START

Will CONSULT-III be used?

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 5.

2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 3.

3.

CHECK PNP SIGNAL

 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.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Go to 

EC-969, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Select “DATA MONITOR” mode with CONSULT-III.

2.

Start engine and warm it up to normal operating temperature.

3.

Maintain the following conditions for at least 50 consecutive seconds.

CAUTION:

Always drive vehicle at a safe speed.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0850

Park/neutral position 
switch

The signal of the park/neutral position (PNP) 
signal does not change during driving after the 
engine is started.

• Harness or connectors

[The park/neutral position (PNP) signal 
circuit is open or shorted.]

• TCM

Position (Selector lever)

Known-good signal

N or P position

ON

Except above position

OFF

ENG SPEED

1,300 - 6,375 rpm

COOLAN TEMP/S

More than 70

°

C (158

°

F)

B/FUEL SCHDL

2.0 - 31.8 msec