Infiniti G35 (V35) Sedan. Manual - part 548

EC-338

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0605 ECM

P0605 ECM

Description

INFOID:0000000000956721

The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.

DTC Logic

INFOID:0000000000956722

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

1.

Turn ignition switch ON.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-339, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

1.

Turn ignition switch ON and wait at least 1 second.

2.

Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.

3.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-339, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION C

1.

Turn ignition switch ON and wait at least 1 second.

2.

Turn ignition switch OFF, wait at least 10 seconds, and then turn ON.

3.

Repeat step 2 for 32 times.

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-339, "Diagnosis Procedure"

.

NO

>> INSPECTION END

JMBIA0057ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0605

Engine control module

A)

ECM calculation function is malfunctioning.

• ECM

B)

ECM EEP-ROM system is malfunctioning.

C)

ECM self shut-off function is malfunctioning.

P0605 ECM

EC-339

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

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F

G

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EC

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Diagnosis Procedure

INFOID:0000000000956723

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-338, "DTC Logic"

.

 With GST

1.

Turn ignition switch ON.

2.

Select Service $04 with GST.

3.

Perform DTC Confirmation Procedure.
See 

EC-338, "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-15, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-

ment"

.

>> INSPECTION END

EC-340

< COMPONENT DIAGNOSIS >

[VQ35HR]

P0643 SENSOR POWER SUPPLY

P0643 SENSOR POWER SUPPLY

DTC Logic

INFOID:0000000000956724

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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.

>> 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-340, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000956725

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-42, "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.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 3.

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.]
[EVT control position sensor (bank 1) circuit is shorted.]
(PSP sensor circuit is shorted.)

• Accelerator pedal position sensor
• Throttle position sensor
• Camshaft position sensor (PHASE) (bank 1)
• Exhaust valve timing control position sensor (bank 1)
• Power steering pressure sensor

APP sensor

Ground

Voltage

Connector

Terminal

E112

5

Ground

Approx. 5V

P0643 SENSOR POWER SUPPLY

EC-341

< COMPONENT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

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M

A

EC

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P

O

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-262, "Component Inspection"

.)

• Exhaust valve timing control position sensor (bank 1) (Refer to 

EC-350, "Component Inspection"

.)

• Power steering pressure sensor (Refer to 

EC-335, "Component Inspection"

.)

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace malfunctioning component.

5.

CHECK TP SENSOR

Refer to 

EC-179, "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-179, "Special Repair Requirement"

.

>> INSPECTION END

7.

CHECK APP SENSOR

Refer to 

EC-427, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Go to 

EC-427, "Special Repair Requirement"

.

>> INSPECTION END

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

>> INSPECTION END

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

EVT control position sensor (bank 1)

F4

1

PSP sensor

F35

3

M107

99

APP sensor

E112

5