Infiniti M35/M45 Y50. Manual — part 503

DTC P0605 ECM

EC-485

[VQ35DE]

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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-248, "ECM Re-Communicating Function"

.

3.

Perform

EC-85, "VIN Registration"

.

4.

Perform

EC-86, "Accelerator Pedal Released Position Learning"

.

5.

Perform

EC-86, "Throttle Valve Closed Position Learning"

.

6.

Perform

EC-86, "Idle Air Volume Learning"

.

>> INSPECTION END

EC-486

[VQ35DE]

DTC P0643 SENSOR POWER SUPPLY

DTC P0643 SENSOR POWER SUPPLY

PFP:18919

On Board Diagnosis Logic

NBS0052I

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

NBS0052J

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-489, "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

DTC P0643 SENSOR POWER SUPPLY

EC-487

[VQ35DE]

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Wiring Diagram

NBS0052K

TBWT1477E

EC-488

[VQ35DE]

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

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