Infiniti M35/M45 Y50. Manual - part 549

FUEL INJECTOR

EC-669

[VQ35DE]

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EC

FUEL INJECTOR

PFP:16600

Component Description

NBS0057T

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-II Reference Value in Data Monitor Mode

NBS0057U

Specification data are reference values.

SEF375Z

MONITOR ITEM

CONDITION

SPECIFICATION

B/FUEL SCHDL

See 

EC-143, "TROUBLE DIAGNOSIS - SPECIFICATION VALUE"

 .

INJ PULSE-B1
INJ PULSE-B2

●

Engine: After warming up

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Selector lever: P or N

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Air conditioner switch: OFF

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No load

Idle

2.0 - 3.0 msec

2,000 rpm

1.9 - 2.9 msec

EC-670

[VQ35DE]

FUEL INJECTOR

Wiring Diagram

NBS0057V

TBWT0996E

FUEL INJECTOR

EC-671

[VQ35DE]

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

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.

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

Diagnostic Procedure

NBS0057W

1. 

INSPECTION START

Turn ignition switch to START.
Is any cylinder ignited?

Yes or No

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

>> GO TO 6.

2. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine.

2.

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

3.

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

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

21
22
23
40
41
42

W
R/Y
R/B
V/R
R/L
R/W

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

[Engine is running]

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Warm-up condition

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Idle speed

NOTE:
The pulse cycle changes depending on rpm 
at idle

BATTERY VOLTAGE

(11 - 14V)

[Engine is running]

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Warm-up condition

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Engine speed: 2,000 rpm

BATTERY VOLTAGE

(11 - 14V)

PBIB0042E

PBIB0043E

PBIB0133E

EC-672

[VQ35DE]

FUEL INJECTOR

3. 

CHECK FUNCTION OF FUEL INJECTOR-I

1.

Turn ignition switch OFF.

2.

Disconnect harness connectors F221 (1), F33 (2).

–

: Vehicle front 

–

Cylinder head (bank 2) (3)

3.

Turn ignition switch ON.

4.

Check voltage between harness connector F33 terminal 5 and
ground with CONSULT-II or tester.

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.

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Harness connectors M72, F102

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Harness connectors F33

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Fuse block (J/B) connector M4

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15A fuse

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Harness for open or short between harness connector F33 and fuse

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Harness for open or short between harness connector F33 and ECM

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

PBIB2785E

Voltage: Battery voltage

Cylinder

Harness connector F33 terminal

ECM terminal

1

6

23

2

4

42

3

2

22

4

3

41

5

1

21

6

7

40

Continuity should exist.

PBIB2323E