Infiniti G37 Coupe. Manual - part 544

P0605 ECM

EC-357

< COMPONENT DIAGNOSIS >

[VQ37VHR]

C

D

E

F

G

H

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M

A

EC

N

P

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YES

>> Go to 

EC-357, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734172

1.

INSPECTION START

With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “SELF-DIAG RESULTS” mode with CONSULT-III.

3.

Touch “ERASE”.

4.

Perform DTC Confirmation Procedure.
See 

EC-356, "DTC Logic"

.

With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-356, "DTC Logic"

.

Is the 1st trip DTC P0605 displayed again?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

REPLACE ECM

1.

Replace ECM.

2.

Go to 

EC-16, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : Special Repair

Requirement"

.

>> INSPECTION END

EC-358

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0643 SENSOR POWER SUPPLY

P0643 SENSOR POWER SUPPLY

DTC Logic

INFOID:0000000001734173

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

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

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-358, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734174

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-41, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

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 the voltage between APP sensor harness connector and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0643

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.)
(TP sensor circuit is shorted.)
[CMP sensor (PHASE) (bank 1) circuit is shorted.]
[Manifold absolute pressure (MAP) sensor circuit is 
shorted.]
(PSP sensor circuit is shorted.)
[CMP sensor (PHASE) (bank 2) circuit is shorted.]
[Battery current sensor circuit is shorted/]

• Accelerator pedal position sensor
• Throttle position sensor
• Camshaft position sensor (PHASE) (bank 1)
• Manifold absolute pressure (MAP) sensor
• Power steering pressure sensor
• Camshaft position sensor (PHASE) (bank 2)
• Battery current sensor

P0643 SENSOR POWER SUPPLY

EC-359

< COMPONENT DIAGNOSIS >

[VQ37VHR]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 3.

3.

CHECK SENSOR POWER SUPPLY CIRCUITS

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK COMPONENTS

Check the following.
• Camshaft position sensor (PHASE) (bank 1) (Refer to 

EC-271, "Component Inspection"

.)

• Manifold absolute pressure (MAP) sensor (Refer to 

EC-178, "Component Inspection"

.)

• Power steering pressure sensor (Refer to 

EC-347, "Component Inspection"

.)

• Camshaft position sensor (PHASE) (bank 2) (Refer to 

EC-271, "Component Inspection"

.)

• Battery current sensor (Refer to 

EC-410, "Component Inspection"

.)

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning component.

5.

CHECK TP SENSOR

Refer to 

EC-189, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 6.

6.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace electric throttle control actuator.

2.

Go to 

EC-189, "Special Repair Requirement"

.

>> INSPECTION END

7.

CHECK APP SENSOR

Refer to 

EC-460, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

APP sensor

Ground

Voltage

Connector

Terminal

E112

5

Ground

Approx. 5V

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F101

43

Electric throttle control actuator (bank 2)

F27

1

44

Electric throttle control actuator (bank 1)

F6

6

F102

60

CMP sensor (PHASE) (bank 1)

F5

1

Manifold absolute pressure (MAP) sen-
sor

F50

1

PSP sensor

F35

3

64

CMP sensor (PHASE) (bank 2)

F18

1

Battery current sensor

E21

1

M107

99

APP sensor

E112

5

EC-360

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0643 SENSOR POWER SUPPLY

NO

>> GO TO 8.

8.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Go to 

EC-460, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END