Mitsubishi Galant. Manual — part 176

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-385

INSPECTION PROCEDURE 30: Fuel pump system.

M

AK000526

2

3 4

1 2 3

4

4 5 6

1 2

1

3

2

4 5

4

8

7

2

6

3

5

1

6

BL

ACK

-

WHITE

3

BL

ACK

-

WHITE

1

BL

ACK

-

WHITE

BL

ACK

-

WHITE

BL

ACK

-

WHITE

BL

ACK

-

WHITE

5

VIOLET

WHITE-BL

ACK

WHITE-

BL

ACK

WHITE-

BL

ACK

BL

ACK

IG2

ST

LOCK

ACC

IG1

C-58

2

5

C-04
MU801333

29

JUNCTION
BLOCK

R

C-73
MU801331

IGNITION
SWITCH

3

POWERTRAIN CONTROL
MODULE(PCM)

FUEL PUMP
AND GAUGE UNIT

FUEL PUMP RELAY

A-20X

3

4

1

2

21

6

D-14
(MU802058)

5

4

5

4

15 16

26 27 28 29

32 33 34

17 18 19 20 21 22 23 24 25

30 31

36 37

35

38

10

11 12 13

1 2 3

4 5 6 7 8 9

14

C-66

C-17

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

C-39
(MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

1 2 3 4 5

6 7 8 9 10

1112 13 14 1516 171819 20 2122

C-71
MU801461

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-386

AK000565

CONNECTOR:D-14

AC

AK000631AC

CONNECTOR:C-73

AK000641

CONNECTOR:A-20X

FUEL PUMP
RELAY

AB

AK000632 AB

CONNECTOR:C-66

AK000280

CONNECTOR : C-39

PCM

AW

AK000633 AE

CONNECTOR:C-04

AK000634 AB

CONNECTOR:C-58

AK000566AB

CONNECTOR:C-17

AK000567AB

CONNECTOR:C-71

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-387

CIRCUIT OPERATION

•

A battery positive voltage is applied on the fuel
pump relay (terminal 3, 4) from the ignition
switch-IG.

•

During cranking and while the engine is running,
the PCM turns the power transistor in the PCM
ON to ground the fuel pump relay coil. With this,
the fuel pump relay turns ON, and the battery
positive voltage is supplied to the fuel pump from
the fuel pump relay (terminal 1).

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:）

））

）

•

Malfunction of the fuel pump relay.

•

Malfunction of the fuel pump.

•

Improper connector contact, open or short-
circuited harness wire.

•

Malfunction of the PCM.

DIAGNOSIS

Required Special Tool:
MB991502:Scan Tool (MUT- Ⅱ )

STEP 1. Using scan tool MB991502, check actuator test
item 07: Fuel Pump.

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the actuator test mode for item

07, Fuel Pump.

•

An operation sound of the fuel pump should be heard.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the fuel pump operating properly?

YES : That this malfunction is intermittent. Refer to GROUP

00, How to Use Troubleshooting/Inspection Service
Points (

P.00-8

).

NO : Go to Step 2.

STEP 2. Check connector D-14 at fuel pump for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

AC003081 AB

16 PIN

MB991502

AK000565

CONNECTOR:D-14

AC

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-388

STEP 3 Check the fuel pump operation.
(1) Disconnect fuel pump connector D-14.
(2) Use jumper wires to connect fuel pump connector terminal

5 to the positive battery terminal and terminal 4 to the
negative battery terminal.

•

An operating sound of the fuel pump should be heard.

Q: Is the fuel pump operating properly?

YES : Go to Step 4.
NO : Replace the fuel pump. Then confirm that the

malfunction symptom is eliminated.

STEP 4. Check the continuity at fuel pump harness side
connector D-14.
(1) Disconnect the connector D-14 and measure at the harness

side.

(2) Check for the continuity between terminal 4 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 5.
NO : Repair harness wire damage between fuel pump

connector D-14 terminal 4 and ground because of
open circuit or harness damage. Then confirm that
the malfunction symptom is eliminated.

STEP 5. Check connector A-20X at fuel pump relay for
damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

AKX01439

FUEL PUMP SIDE
CONNECTOR

AB

1 2 3

4 5

AKX01440

3 2 1

4

5

D-14 HARNESS
SIDE CONNECTOR

AD

AK000641

CONNECTOR:A-20X

FUEL PUMP
RELAY

AB