Infiniti FX35 / FX45. Manual - part 597

FUEL INJECTOR

EC-1149

< SERVICE INFORMATION >

[VK45DE]

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FUEL INJECTOR

Component Description

INFOID:0000000001327051

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.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001327052

Specification data are reference values.

SEF375Z

MONITOR ITEM

CONDITION

SPECIFICATION

B/FUEL SCHDL

See 

EC-709

.

INJ PULSE-B1
INJ PULSE-B2

• Engine: After warming up
• Selector lever: P or N
• Air conditioner switch: OFF
• No  load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

EC-1150

< SERVICE INFORMATION >

[VK45DE]

FUEL INJECTOR

Wiring Diagram

INFOID:0000000001327053

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.

CAUTION:

TBWM1362E

FUEL INJECTOR

EC-1151

< SERVICE INFORMATION >

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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.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

Diagnosis Procedure

INFOID:0000000001327054

1.

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?
Yes or No

Yes (With CONSULT-III)>>GO TO 2.
Yes (Without CONSULT-III)>>GO TO 3.
No

>> GO TO 3.

2.

CHECK OVERALL 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.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3.

CHECK FUNCTION OF FUEL INJECTOR-I

 Without CONSULT-III

1.

Turn ignition switch OFF.

2.

Disconnect harness connector F21, F201 (Bank 1) and F41, F221 (Bank 2).

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

21
22
23
40
41
42
44
63

W
R
P
PU
BR
B
OR
G

Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 6
Fuel injector No. 4 
Fuel injector No. 2
Fuel injector No. 7
Fuel injector No. 8

[Engine is running]
• Warm-up condition
• Idle speed

NOTE:
The pulse cycle changes depending on rpm 
at idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

PBIB0042E

PBIB0043E

EC-1152

< SERVICE INFORMATION >

[VK45DE]

FUEL INJECTOR

3.

Turn ignition switch ON.

4.

Check voltage between the following;
harness connector F21 terminal 5 and ground,
harness connector F41 terminal 5 and ground.

5.

Turn ignition switch OFF.

6.

Disconnect ECM harness connector.

7.

Check harness continuity between the following terminals.

8.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M82, F102
• Harness connectors F21, F201
• Harness connectors F41, F221
• Fuse block (J/B) connector M1
• 15A fuse
• Harness for open or short between harness connector F21 and fuse
• Harness for open or short between harness connector F41 and fuse
• Harness for open or short between harness connector F21 and ECM
• Harness for open or short between harness connector F41 and ECM

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

5.

CHECK FUNCTION OF FUEL INJECTOR-II

: Vehicle front

1.

Harness connectors F41, F221

2.

Harness connectors F21, F201

Voltage: Battery voltage

Cylinder

Harness connector terminal

ECM terminal

1

F21 terminal 3

23

3

F21 terminal 2

22

5

F21 terminal 1

21

7

F21 terminal 6

44

2

F41 terminal 3

42

4

F41 terminal 2

41

6

F41 terminal 1

40

8

F41 terminal 6

63

Continuity should exist.

PBIB3248E

PBIB0180E