Infiniti G35 (V35). Manual - part 405

DTC P0643 SENSOR POWER SUPPLY

EC-501

C

D

E

F

G

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L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

48

B/Y

Sensor power supply
(EVAP control system pres-
sure sensor)

[Ignition switch: ON]

Approximately 5V

49

W/L

Sensor power supply
(Refrigerant pressure sen-
sor)

[Ignition switch: ON]

Approximately 5V

68

Y

Sensor power supply
(Power steering pressure 
sensor)

[Ignition switch: ON]

Approximately 5V

82

GY/L

Sensor ground
(Accelerator pedal position 
sensor 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

83

B/R

Sensor ground
(Accelerator pedal position 
sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

90

BR/Y

Sensor power supply
(Accelerator pedal position 
sensor 1)

[Ignition switch: ON]

Approximately 5V

91

G

Sensor power supply
(Accelerator pedal position 
sensor 2)

[Ignition switch: ON]

Approximately 5V

98

LG/B

Accelerator pedal position 
sensor 2

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully released

0.15 - 0.60V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully depressed

1.95 - 2.40V

106

BR

Accelerator pedal position 
sensor 1

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully released

0.5 - 1.0V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully depressed

3.9 - 4.7V

EC-502

DTC P0643 SENSOR POWER SUPPLY

Diagnostic Procedure

NBS000XW

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body. Refer to 

EC-159, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-I

1.

Disconnect accelerator pedal position (APP) sensor harness
connector.

2.

Turn ignition switch ON.

3.

Check voltage between APP sensor terminal 6 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

PBIB2192E

PBIB0996E

Voltage: Approximately 5V

PBIB0914E

DTC P0643 SENSOR POWER SUPPLY

EC-503

C

D

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F

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EC

3. 

CHECK SENSOR POWER SUPPLY CIRCUITS

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

OK or NG

OK

>> GO TO 4.

NG

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

4. 

CHECK COMPONENTS

Check the following.

●

EVAP control system pressure sensor (Refer to 

EC-448, "Component Inspection"

 .)

●

Refrigerant pressure sensor (Refer to 

ATC-88, "COMPONENT INSPECTION"

 .)

●

Power steering pressure sensor (Refer to 

EC-491, "Component Inspection"

 .)

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning component.

5. 

CHECK APP SENSOR

Refer to 

EC-597, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Perform 

EC-79, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-79, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-79, "Idle Air Volume Learning"

 .

>> INSPECTION END

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

ECM terminal

Sensor terminal

Reference Wiring Diagram

48

EVAP control system pressure sensor terminal 3

EC-445

49

Refrigerant pressure sensor terminal 1

EC-679

68

PSP sensor terminal 1

EC-488

90

APP sensor terminal 6

EC-500

EC-504

DTC P0850 PNP SWITCH

DTC P0850 PNP SWITCH

PFP:23006

Component Description

NBS00108

When the shift lever position is P or N (A/T), Neutral (M/T), park/neutral position (PNP) switch is ON.
ECM detects the position because the continuity of the line (the ON signal) exists.
Then the TCM sends the PNP switch signal to the ECM via combination meter. (A/T models)

CONSULT-II Reference Value in Data Monitor Mode

NBS00109

Specification data are reference values.

On Board Diagnosis Logic

NBS0010A

DTC Confirmation Procedure

NBS0010B

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-II

1.

Turn ignition switch ON.

2.

Select “P/N POSI SW” in “DATA MONITOR” mode with CON-
SULT-II. Then check the “P/N POSI SW” signal under the follow-
ing conditions.

If NG, go to 

EC-509, "Diagnostic Procedure"

 .

If OK, go to following steps.

3.

Select “DATA MONITOR” mode with CONSULT-II.

4.

Start engine and warm it up to normal operating temperature.

5.

Maintain the following conditions for at least 60 consecutive sec-
onds.

6.

If 1st trip DTC is detected, go to 

EC-509, "Diagnostic Procedure"

.

MONITOR ITEM

CONDITION

SPECIFICATION

P/N POSI SW

●

Ignition switch: ON

Shift lever: P or N (A/T), Neutral (M/T)

ON

Shift lever: Except above position

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0850
0850

Park/neutral position 
switch

The signal of the park/neutral position (PNP) 
switch is not changed in the process of engine 
starting and driving.

●

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

●

Park/neutral position (PNP) switch

●

TCM (A/T models)

●

Combination meter (A/T models)

Position (Shift lever)

Known-good signal

N or P position (A/T)
Neutral position (M/T)

ON

Except above position

OFF

ENG SPEED

1,400 - 6375 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)

Shift lever

Suitable position

SEF212Y

SEF213Y