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.

(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 No.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 the ignition switch.

(b)

At the same time, check the fuel pump relay terminal No.3
voltage with a multimeter.

Note

Pump relay will only work for a short period. use scan
tool drive fuel pump relay work to facilitate inspection.

Standard Voltage: 11-14 V

Is the voltage Standard Value?

Yes

Go to step 5

No

Step 4

Repair fuel pump relay terminal No.3 and fuel pump fuse EF05 circuit open fault.

(a)

Repair fuel pump relay terminal No.3 and fuel pump fuse
EF05 circuit open fault.

Is fuel pump working properly?

Yes

System normal

No

Step 5

Check fuel pump relay terminal No.1 voltage.

Engine

Fuel System JL4G15-D

2-799

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

FE02-5501b

(a)

Use scan tool to drive pump relay.

(b)

Check fuel pump relay terminal No.1 voltage with a
multimeter.

Standard Voltage: 11-14 V

Is the voltage Standard Value?

Yes

Go to step 8

No

Step 6

Repair ECM harness connector EO35 terminal No.71 and pump relay connector No.1 circuit open fault.

(a)

Repair ECM harness connector EO35 terminal No.71 and
pump relay connector No.1 circuit open fault.

Is fuel pump working correctly?

No

System normal

Yes

Step 7

Replace ECM.

(a)

Replace ECM. Refer to 

2.2.8.8

 

Engine Control Module

Replacement

.

Note

Replace ECM. Make sure that ECM power supply and
ground circuits have no faults.

Is fuel pump working properly?

Yes

System normal

No

Step 8

Test continuity between pump relay terminal No.2 and the ground circuit.

(a)

Measure resistance between pump relay terminal No.2 and
ground with a multimeter.

Standard Value: Less than 1 Ω

Is the resistance specified value?

Yes

Go to step 10

No

Step 9

Repair pump relay terminal No.2 Ground circuit fault.

2-800

Fuel System JL4G15-D

Engine

Step 10

Check pump relay terminal No.5 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

FE02-5407b

(a)

Turn on the ignition switch.

Standard Voltage: 11-14 V

Confirm whether the voltage is standard value.

Yes

Go to step 12

No

Step 11

Replace the fuel pump relay.

(a)

Replace the fuel pump relay.

Make sure fuel pump is working properly.

Yes

System normal

No

Step 12

Check the fuel pump wiring harness connector SO29 terminal No.3 voltage.

1

2

3

4

Fuel Pump Harness Connector SO29

FE02-5408b

(a)

Check fuel pump wiring harness connector SO29 terminal
No.3 voltage with a multimeter.

Standard Voltage: 11-14 V

Is the voltage standard value?

Yes

Go to step 14

No

Step 13

Repair the circuit between fuel pump wiring harness connector SO29 terminal No.3 and the fuel pump relay
terminals No.5.

Engine

Fuel System JL4G15-D

2-801

1

2

3

4

Fuel Pump Harness Connector SO29

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

FE02-5409b

(a)

Check the circuit between fuel pump wiring harness
connector SO29 terminal No.3 and the fuel pump relay
terminals No.5.

(b)

Repair the circuit between fuel pump wiring harness
connector SO29 terminal No.3 and the fuel pump relay
terminals No.5 open fault.

Is fuel pump working properly?

Yes

System normal

No

Step 14

Check fuel pump wiring harness connector SO29 terminal No.4 and body ground circuit.

1

2

3

4

Fuel Pump Harness Connector SO29

FE02-5410b

(a)

Check resistance between fuel pump wiring harness
connector SO29 terminal No.4 and body ground circuit with
a multimeter.

Standard Resistance Value: Less than 1 Ω

Is fuel pump ground circuit normal?

Yes

Go to step 16

No

Step 15

Repair fuel pump wiring harness connector SO29 terminal No.4 and body ground circuit.

(a)

Repair fuel pump wiring harness connector SO29 terminal
No.4 and body ground circuit open fault.

Is fuel pump working properly?

Yes

System normal

2-802

Fuel System JL4G15-D

Engine