Infiniti FX35 / FX45. Manual - part 562

 

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Infiniti FX35 / FX45. Manual - part 562

 

 

DTC P0643 SENSOR POWER SUPPLY

EC-1009

< SERVICE INFORMATION >

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DTC P0643 SENSOR POWER SUPPLY

On Board Diagnosis Logic

INFOID:0000000001326868

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

INFOID:0000000001326869

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.
1.

Start engine and let it idle for 1 second.

2.

Check DTC.

3.

If DTC is detected, go to 

EC-1011, "Diagnosis Procedure"

.

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 short-
ed.)
(PSP sensor circuit is shorted.)

• Accelerator pedal position sensor
• EVAP control system pressure sensor
• Refrigerant pressure sensor
• Power steering pressure 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.

EC-1010

< SERVICE INFORMATION >

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DTC P0643 SENSOR POWER SUPPLY

Wiring Diagram

INFOID:0000000001326870

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.

TBWM1350E

DTC P0643 SENSOR POWER SUPPLY

EC-1011

< SERVICE INFORMATION >

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Diagnosis Procedure

INFOID:0000000001326871

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-723, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

48

L

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

[Ignition switch: ON]

Approximately 5V

49

PU

Sensor power supply
(Refrigerant pressure sen-
sor)

[Ignition switch: ON]

Approximately 5V

68

SB

Sensor power supply
(Power steering pressure 
sensor)

[Ignition switch: ON]

Approximately 5V

82

B/W

Sensor ground
(APP sensor 1 / ICC steering 
switch / ASCD steering 
switch)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

83

G/OR

Sensor ground
(APP sensor 2)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

90

L/B

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

91

G

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

98

Y/R

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

OR

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

PBIB2195E

EC-1012

< SERVICE INFORMATION >

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DTC P0643 SENSOR POWER SUPPLY

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

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-965, "Component Inspection"

.)

• Refrigerant pressure sensor (Refer to 

ATC-69, "Magnet Clutch Circuit"

.)

• Power steering pressure sensor (Refer to 

EC-1002, "Component Inspection"

.)

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning component.

5.

CHECK APP SENSOR

Refer to 

EC-1109, "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-662, "Accelerator Pedal Released Position Learning"

.

PBIB1548E

Voltage: Approximately 5V

PBIB0914E

ECM terminal

Sensor terminal

Reference Wiring Diagram

90

APP sensor terminal 6

EC-1010

48

EVAP control system pressure sensor terminal 3

EC-962

49

Refrigerant pressure sensor terminal 1

EC-1178

68

PSP sensor terminal 1

EC-999

 

 

 

 

 

 

 

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