Mitsubishi Lancer Evolution X. Manual - part 451

ON-VEHICLE SERVICE

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MULTIPORT FUEL INJECTION (MFI)

13A-869

2. Remove the floor inspection lid (LH).

3. Disconnect the fuel pump module connector.
4. Crank the engine for two seconds or more, and turn the 

ignition switch to the "LOCK" (OFF) position.
NOTE: If the engine starts, wait until the engine stops by 
itself, then turn the ignition switch to the "LOCK" (OFF) posi-
tion.

5. Connect the fuel pump module.
6. Install the floor inspection lid (LH).
7. Install the rear seat cushion assembly. (Refer to GROUP 

52A, Rear Seat Assembly 

P.52A-27

).

FUEL PUMP OPERATION CHECK

M1131002002171

1. Remove the fuel tank cap.

NOTE: The operating sound of the fuel tank pump is difficult 
to be heard because the pump is in-tank type. Therefore, 
remove the fuel filler cap to check the sound from the fuel 
filler port.

2. Using scan tool, forcibly drive the fuel tank pump (integrated 

in the fuel pump module) to check the fuel tank pump 
operation.

3. Install the fuel tank cap.
4. If the fuel tank pump does not operate, follow the procedure 

below to check the pump for operation. If it is normal, check 
the driving circuit.

(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Remove the rear seat cushion assembly. (Refer to 

GROUP 52A, Rear Seat Assembly 

P.52A-27

).

(3) Remove the floor inspection lid (LH).

AC703013

AE

Floor inspection lid (LH)

AC709179

Fuel pump module connector

AB

AC703013

AE

Floor inspection lid (LH)

ON-VEHICLE SERVICE

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MULTIPORT FUEL INJECTION (MFI)

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(4) Disconnect the fuel pump module connector.

(5) When the battery is connected to the fuel pump module 

connector (fuel pump module side), check that the pump 
operating sound can be heard. When the pump operating 
sound cannot be heard, replace the fuel tank pump. 
(Refer to GROUP 13B, On-Vehicle Service − Fuel Pump 

Module Replacement 

P.13B-6

).

NOTE: The operating sound of the fuel tank pump is diffi-
cult to be heard because the pump is in-tank type. There-
fore, remove the fuel filler cap to check the sound from 
the fuel filler port.

(6) Connect the fuel pump module connector.
(7) Install the floor inspection lid (LH).
(8) Install the rear seat cushion assembly. (Refer to GROUP 

52A, Rear Seat Assembly 

P.52A-27

).

MULTIPORT FUEL INJECTION (MFI) RELAY 
CONTINUITY CHECK

M1131050001434

Inspect the MFI relay for continuity in accordance with the chart 
shown below.

AC709179

Fuel pump module connector

AB

AC709289

1

2

3

4

5

AB

Fuel pump module connector

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

1 − 3

Supplied

1 − 3

2 − 4

AK703719

1

3

2

4

1

3

2

4

AB

MFI relay side connector

MFI relay
side connector

ON-VEHICLE SERVICE

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MULTIPORT FUEL INJECTION (MFI)

13A-871

FUEL PUMP RELAY CONTINUITY CHECK

M1131033001486

Fuel pump relay 1

Inspect the fuel pump relay 1 for continuity in accordance with 
the chart shown below.

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

1 − 2

Supplied

1 − 2

3 − 4

AK703720

1

2

3
4

1

2

3
4

AD

Fuel pump relay 1
side connector

Fuel pump relay 1
side connector

ON-VEHICLE SERVICE

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MULTIPORT FUEL INJECTION (MFI)

13A-872

Fuel pump relay 2

Inspect the fuel pump relay 2 for continuity in accordance with 
the chart shown below.

BATTERY 
VOLTAGE

TERMINAL 
NO. TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. TO 
BE CONDUCTED

Supplied

6 (Connector 
"A") − 11 

(Connector 
"B") 

1 (Connector "C") − 

1 (Connector "D") 

AK604483AB

ETACS-ECU

Connector “B”

Connector “D”

Connector “C”

Connector “A”

1 2 3 4

5 6 7

8 9 10 11

131415

12

1 2

1 2

1

6

4

5

9

8

10 11

13

15

14

12

16

7

2 3

AK704078 AB

ETACS-ECU side connector

Connector “D”

Connector “C”

Connector “B”

Connector “A”