Infiniti Q45. Manual - part 518

FUEL INJECTOR

EC-711

C

D

E

F

G

H

I

J

K

L

M

A

EC

3. 

CHECK FUNCTION OF FUEL INJECTOR-I

1.

Turn ignition switch OFF.

2.

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

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
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.

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.

PBIB2438E

PBIB0180E

EC-712

FUEL INJECTOR

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E32, F32

●

Harness connectors F21, F201

●

Harness connectors F41, F221

●

Fuse block (J/B) No. 1 connector M1

●

Fuse block (J/B) No. 2 connectors M143, E215

●

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

Provide battery voltage between the following terminals, and then
interrupt it. Listen to each fuel injector operating sound.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 6.

Cylinder

Harness connector

terminal

(+)

(–)

1

F201

5

3

3

2

5

1

7

6

2

F221

5

3

4

2

6

1

8

6

Operating sound should exist.

PBIB2449E

FUEL INJECTOR

EC-713

C

D

E

F

G

H

I

J

K

L

M

A

EC

6. 

CHECK SUB-HARNESS CIRCUIT FOR OPEN AND SHORT

1.

Disconnect injector harness connectors.

2.

Check harness continuity between the following terminals. Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 7.

NG

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

7. 

CHECK FUEL INJECTOR

Refer to 

EC-714, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace fuel injector.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Harness connector terminal

Fuel injector terminal

F201 terminal 1

2

F201 terminal 2

F201 terminal 3

F201 terminal 6

F201 terminal 5

1

F221 terminal 1

2

F221 terminal 2

F221 terminal 3

F221 terminal 6

F221 terminal 5

1

Continuity should exist.

PBIB2423E

EC-714

FUEL INJECTOR

Component Inspection

NBS00278

FUEL INJECTOR

1.

Disconnect fuel injector harness connector.

2.

Check resistance between terminals as shown in the figure.

Removal and Installation

NBS00279

FUEL INJECTOR

Refer to 

EM-32, "FUEL INJECTOR AND FUEL TUBE"

 .

Resistance: 13.5 - 17.5

Ω

 [at 10 - 60

°

C (50 - 140

°

F)]

PBIB1727E