Infiniti M35/M45 Y50. Manual - part 680

 

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Infiniti M35/M45 Y50. Manual - part 680

 

 

DTC P0643 SENSOR POWER SUPPLY

EC-1193

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0643 SENSOR POWER SUPPLY

PFP:18919

On Board Diagnosis Logic

NBS005JY

This self-diagnosis has the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up. 

DTC Confirmation Procedure

NBS005JZ

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for 1 second.

4.

If DTC is detected, go to 

EC-1196, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0643
0643

Sensor power supply 
circuit short

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

Harness or connectors
(APP sensor 1 circuit is shorted.)
(EVAP control system pressure sensor is 
shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)
(PSP sensor circuit is shorted.)
(Battery current sensor circuit is shorted.)

Accelerator pedal position sensor

EVAP control system pressure sensor

Refrigerant pressure sensor

Power steering pressure sensor

Battery current sensor

Engine operation condition in fail-safe mode

ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return 
spring.

SEF058Y

EC-1194

[VK45DE]

DTC P0643 SENSOR POWER SUPPLY

Wiring Diagram

NBS005K0

TBWT1496E

DTC P0643 SENSOR POWER SUPPLY

EC-1195

[VK45DE]

C

D

E

F

G

H

I

J

K

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

BR

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

[Ignition switch: ON]

Approximately 5V

49

B/Y

Sensor power supply
(Refrigerant pressure sen-
sor, Battery current sensor)

[Ignition switch: ON]

Approximately 5V

68

L/Y

Sensor power supply
(Power steering pressure 
sensor)

[Ignition switch: ON]

Approximately 5V

82

W

Sensor ground
(APP sensor 1)

[Engine is running]

Warm-up condition

Idle speed

Approximately 0V

83

P

Sensor ground
(APP sensor 2)

[Engine is running]

Warm-up condition

Idle speed

Approximately 0V

90

L

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

91

BR

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

98

R

Accelerator pedal position 
sensor 2

[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully released

0.20 - 0.55V

[Ignition switch: ON]

Engine: Stopped

Accelerator pedal: Fully depressed

1.85 - 2.40V

106

LG

Accelerator pedal position 
sensor 1

[Ignition switch: ON]

Engine: Stopped

Accelerator pedal: Fully released

0.4 - 1.1V

[Ignition switch: ON]

Engine: Stopped

Accelerator pedal: Fully depressed

3.7 - 4.8V

EC-1196

[VK45DE]

DTC P0643 SENSOR POWER SUPPLY

Diagnostic Procedure

NBS005K1

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body. 
Refer to 

EC-864, "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

1.

Disconnect accelerator pedal position (APP) sensor (1) harness
connector.

2.

Turn ignition switch ON.

3.

Check voltage between APP sensor terminal 4 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

1.

Body ground M70

2.

Body ground M16

PBIB2782E

PBIB2704E

Voltage: Approximately 5V

PBIA9606J

 

 

 

 

 

 

 

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