Mitsubishi Outlander (2003+). Manual — part 94

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-239

STEP 17. Check harness between B-17X
(terminal No. 1) engine control relay connector
and C-134 (terminal No. 12 and No. 25) engine-
ECU connector.

NOTE: Before checking harness, check intermediate
connector C-17, and repair if necessary.

œ

Check output line for open/short circuit and dam-
age.

Q: Is the check result normal?

YES :

Go to Step 18 .

NO :

Repair.

STEP 18. Check engine control relay output
power supply harness and connector for short
circuit.

Q: Is the check result normal?

YES :

Go to Step 19 .

NO :

Repair.

STEP 19. Check harness between B-17X
(terminal No. 3 and No. 4) engine control relay
connector and battery.

NOTE: Before checking harness, check intermediate
connector A-14, and repair if necessary.

œ

Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 20 .

NO :

Repair.

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

Harness side
connector

AK300257

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13 12

23

24

25

26

21

3

10

11

AB

CONNECTOR: C-134

C-134

Harness side connector

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

Harness side
connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-240

STEP 20. Check harness between B-17X
(terminal No. 2) engine control relay connector
and C-135 (terminal No. 38) engine-ECU
connector.

œ

Check earthing line for damage.

Q: Is the check result normal?

YES :

Go to Step 16 .

NO :

Repair.

AK300255

2

1

3

4

Relay box’s
triangle marks

AB

CONNECTOR: B-17X

B-17X

Harness side
connector

AK300256

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

AB

CONNECTOR: C-135

C-135

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-241

Inspection Procedure 24: Fuel Pump System

AK300311

1 2 3

4

4 5 6

1 2 3

5

3 4

1 2

3 4

1 2

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

3

10 11

IG2

ST

LOCK

ACC

IG1

R

M

24

15A

8

7.5A

C-303

J/B

Ignition switch

Reray box

Engine-ECU

Fuel
pump
relay (1)
C-215

Fuel
pump
relay (2)
C-213

Fuel pump

8

2

41

D-16
(MU802058)

1

14

11

5

4

4

C-134

Fuel pump circuit

OFF

4

2

2

L-B

W

W

C-116

C-202

W

C-203

6

1

3

OFF

ON

ON

1

2

4

3

Battery

C-213

C-215

22

6

C-209

D-24

D-24

C-205

B

B-L

B-L

B

B

G

G

C-205

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V:Violet

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-242

OPERATION

œ

The battery voltage is applied to the fuel pump
relay (1) (terminal No. 3) form the ignition switch
and is earthed to the vehicle body from the fuel
pump relay (1) (terminal No. 2).

œ

The battery voltage is applied to the fuel pump
relay (1) (terminal No. 4) and to the fuel pump
relay (2) (terminal No. 1) from the fuel pump relay
(1) (terminal No. 1).

œ

The battery voltage is applied to the fuel pump
relay (2) (terminal No. 3) from the ignition switch.
The engine-ECU (terminal No. 22) makes the
power transistor in the unit be in "ON" position
and makes currents go on the fuel pump relay (2)
coil, and that makes the relay be in "ON" position.

œ

When the fuel pump relay (2) is in "ON" position,
the battery voltage is supplied to the fuel pump
(low pressure) from the fuel pump relay (2) (ter-
minal No. 4).

FUNCTION

œ

When the ignition switch ON signal is input to the
engine-ECU, the engine-ECU places the fuel
pump relay in the "ON" position. Accordingly, the
battery voltage is supplied to the fuel pump.

PROBABLE CAUSE

œ

Failed fuel pump relay

œ

Failed fuel pump

œ

Open/short circuit in fuel pump drive circuit or
loose connector contact

œ

Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-215 fuel pump relay
(1) connector and C-213 fuel pump relay (2)
connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair.

STEP 2. Check fuel pump relay.

œ

Fuel pump relay, continuity check (Refer to

3

13A

).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace fuel pump relay.

STEP 3. Measure resistance at C-215 fuel pump
relay (1) connector.

œ

Remove relay, and measure at junction block
side.

œ

Resistance between terminal No. 2 and earth.

OK: 2

W

or less

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Check intermediate connector C-205, and

repair if necessary. If intermediate
connector is normal, check and repair
harness between C-215 (terminal No. 2)
fuel pump relay (1) connector and body
earth.

œ

Check earthing line for open circuit
and damage.

AK300312

2 1

3

4

AB

CONNECTOR: C-213, C-215

C-213

C-215

Harness side
connector

Junction block’s
triangle marks

AK300313

2 1

3

4

AB

CONNECTOR: C-215

C-215

Harness side
connector

Junction block’s
triangle marks