Infiniti G35 (V35) Sedan. Manual - part 577

EC-454

< COMPONENT DIAGNOSIS >

[VQ35HR]

ELECTRICAL LOAD SIGNAL

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-5, "Work Flow"

.

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-4, "Work Flow"

.

>> INSPECTION END

FUEL INJECTOR

EC-455

< COMPONENT DIAGNOSIS >

[VQ35HR]

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FUEL INJECTOR

Description

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The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.

Component Function Check

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1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

YES

>> GO TO 2.

NO

>> Go to 

EC-455, "Diagnosis Procedure"

.

2.

CHECK FUEL INJECTOR FUNCTION

 With CONSULT-III

1.

Start engine.

2.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.

3.

Make sure that each circuit produces a momentary engine speed drop.

 Without CONSULT-III

1.

Start engine.

2.

Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-455, "Diagnosis Procedure"

.

Diagnosis Procedure

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1.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between fuel injector harness connector and ground.

SEF375Z

Clicking sound should be heard.

PBIB3332E

EC-456

< COMPONENT DIAGNOSIS >

[VQ35HR]

FUEL INJECTOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• IPDM E/R harness connector E7
• 10A fuse (No. 44)
• Harness for open or short between fuel injector and fuse

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

3.

CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between fuel injector harness connector and ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F106, F107
• Harness for open or short between fuel injector and ECM

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

5.

CHECK FUEL INJECTOR

Refer to 

EC-457, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace malfunctioning fuel injector.

Fuel injector

Ground

Voltage

Cylinder

Connector

Terminal

1

F21

1

Ground

Battery voltage

2

F22

1

3

F23

1

4

F24

1

5

F25

1

6

F26

1

Fuel injector

ECM

Continuity

Cylinder

Connector

Terminal

Connector

Terminal

1

F21

2

F102

89

Existed

2

F22

2

85

3

F23

2

81

4

F24

2

90

5

F25

2

86

6

F26

2

82

FUEL INJECTOR

EC-457

< COMPONENT DIAGNOSIS >

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6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-39, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

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

Component Inspection

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1.

CHECK FUEL INJECTOR

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Check resistance between fuel injector terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning fuel injector.

Terminals

Resistance

1 and 2

11.1 - 14.3 

Ω

 [at 10 - 60

°

C (60 - 140

°

F)]