Infiniti Q45. Manual - part 463

 

  Index      Infiniti     Infiniti Q45 - service repair manual 2006 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  461  462  463  464   ..

 

 

Infiniti Q45. Manual - part 463

 

 

DTC P0605 ECM

EC-491

C

D

E

F

G

H

I

J

K

L

M

A

EC

2. 

REPLACE ECM

1.

Replace ECM.

2.

Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to

BL-202, "ECM Re-Communicating Function"

 .

3.

Perform 

EC-77, "VIN Registration"

 .

4.

Perform 

EC-77, "Accelerator Pedal Released Position Learning"

 .

5.

Perform 

EC-78, "Throttle Valve Closed Position Learning"

 .

6.

Perform 

EC-78, "Idle Air Volume Learning"

 .

>> INSPECTION END

EC-492

DTC P0643 SENSOR POWER SUPPLY

DTC P0643 SENSOR POWER SUPPLY

PFP:18919

On Board Diagnosis Logic

NBS0022G

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

NBS0022H

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-495, "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.)

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.

SEF058Y

DTC P0643 SENSOR POWER SUPPLY

EC-493

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS0022I

TBWM1243E

EC-494

DTC P0643 SENSOR POWER SUPPLY

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

R

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

[Ignition switch: ON]

Approximately 5V

49

L

Sensor power supply
(Refrigerant pressure sen-
sor)

[Ignition switch: ON]

Approximately 5V

68

L

Sensor power supply
(Power steering pressure 
sensor)

[Ignition switch: ON]

Approximately 5V

82

L

Sensor ground
(APP sensor 1)

[Engine is running]

Warm-up condition

Idle speed

Approximately 0V

83

L

Sensor ground
(APP sensor 2)

[Engine is running]

Warm-up condition

Idle speed

Approximately 0V

90

R

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

91

B

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

0.15 - 0.60V

[Ignition switch: ON]

Engine stopped

Accelerator pedal: Fully depressed

1.95 - 2.40V

106

W

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

 

 

 

 

 

 

 

Content   ..  461  462  463  464   ..