2.3.5 Disassemble View
2.3.5.1 Disassemble View

Oil Rail and Jet Assembly Disassemble View

1

2

3

FE02-2023b

Legend

1. Fuel Rail
2. Fuel Injectors

3. Spring Clip

Engine

Fuel System JL4G18-D

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2.3.6 Schematic
2.3.6.1 Schematic

Battery 
Voltage

Main 
Relay

Fuel 
Pump 
Relay

Fuel Pump

Cylinder No.3 
Fuel Injector

Cylinder No.4 
Fuel Injector

Cylinder No.2 
Fuel Injector

Cylinder No.1 
Fuel Injector

Disable/Enable 
Fuel Signal

Ignition Switch

ECM

FE02-2024b

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Fuel System JL4G18-D

Engine

2.3.7 Diagnostic Information and Procedures
2.3.7.1 Diagnostic Descriptions

Refer to 

2.3.2.1

 

Description and Operation

Get familiar with the system functions and operations before start system diagnostics, so

that it will help to determine the correct diagnostic steps in the event of fault, more importantly, it will also help to determine whether
the customer described situations are normal.

2.3.7.2 Visual Inspection

–

Check installed aftermarket equipment that may affect the fuel system operation.

–

Check system components that are easy to access to identify whether there is an obvious damage or external leakage.

–

Check whether the recommended fuel is used and add sufficient fuel.

2.3.7.3 Fuel Pump Inoperative

Schematic:

05

12

From Battery

Main Relay

Fuel Pump

Fuel Pump Relay

Engine 

Control 

Module

FE02-5402b

Diagnostic Steps:

Step 1

Check fuel pump fuse EF05.

Engine

Fuel System JL4G18-D

2-233

1413 12 1110

5

1

2

3

4

6

7

8

9

G

D

C

B

E

F

A

86

86

30

87

85

86

86

87

87

87

30

30

30

85

85

85

2

2

3

3

5

5

1

1

1

2

5 3

EF06

EF02

EF30

EF05

EF16

EF04

EF03

EF15

EF12

EF10

EF1

1

EF09

EF13

EF14

FE02-5403b

Is the fuel pump fuse EF05 blown?

No

Go to step 3

Yes

Step 2

Repair fuel pump fuse EF05 circuit.

(a)

Check fuel pump fuse EF05 circuit.

(b)

Repair fuel pump power circuit short to ground fault.

(c)

Replace the fuse EF05.

Fuse Rating: 15 A

Is fuel pump working properly?

Yes

System normal

No

Step 3

Check fuel pump relay terminal 3 voltage.

J

L

K

I

1

2

5 3

86

87

30

1

1

2

5
3

2

5
3

85

EF01

EF21

EF18

EF25

EF20

EF29

EF17

EF19

EF23

EF22

EF26

EF24

EF08

EF27

EF28

EF32

EF31

FE02-5404b

(a)

Turn on the ignition switch.

(b)

At the same time, check the voltage of fuel pump relay
terminal 3 with a multimeter.

Standard Voltage: 11-14 V

Is voltage the Standard Value?

Yes

Go to step 5

No

Step 4

Repair fuel pump relay terminal 3 and the fuel pump fuse EF05 circuit open fault.

(a)

Repair fuel pump relay terminal 3 and the fuel pump fuse
EF05 open circuit fault.

Is fuel pump working properly?

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Fuel System JL4G18-D

Engine