Infiniti FX35 / FX45. Manual - part 448

FUEL INJECTOR

EC-553

< SERVICE INFORMATION >

[VQ35DE]

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Wiring Diagram

INFOID:0000000001326440

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

CAUTION:

TBWM1408E

EC-554

< SERVICE INFORMATION >

[VQ35DE]

FUEL INJECTOR

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:0000000001326441

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 6.

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 6.

3.

CHECK FUNCTION OF FUEL INJECTOR-I

 Without CONSULT-III

1.

Turn ignition switch OFF.

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

21
22
23
40
41
42

W
G
R
LG
B
P

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]
• 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)

SEC984C

SEC985C

FUEL INJECTOR

EC-555

< SERVICE INFORMATION >

[VQ35DE]

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2.

Disconnect harness connector F50, F251

3.

Turn ignition switch ON.

4.

Check voltage between harness connector F50 terminal 5 and
ground.

5.

Turn ignition switch OFF.

6.

Disconnect ECM harness connector.

7.

Check harness continuity between harness connector F50 and
ECM as follows.
Refer to Wiring Diagram.

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
• Fuse block (J/B) connector M1
• 15A fuse
• Harness for open or short between harness connector F50 and fuse
• Harness for open or short between harness connector F50 and ECM

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

5.

CHECK FUNCTION OF FUEL INJECTOR-II

PBIB2624E

Voltage: Battery voltage

Cylinder

Harness connector F50 

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

EC-556

< SERVICE INFORMATION >

[VQ35DE]

FUEL INJECTOR

Provide battery voltage between harness connector F251 as follows
and then interrupt it. Listen to each fuel injector operating sound.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

6.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect fuel injector harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between fuel injector terminal 1 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M82, F102
• Fuse block (J/B) connector M1
• 10A fuse
• 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.

8.

CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

Cylinder

Harness connector F251 terminal

(+)

(–)

1

5

6

2

4

3

2

4

3

5

1

6

7

Operating sound should exist.

PBIB2497E

PBIB1561E

Voltage: Battery voltage

PBIB0582E