Mitsubishi Galant 9G. Manual — part 905

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1062

STEP 7. Measure the power supply voltage at fuel pump
relay 2 harness side connector C-208.

CAUTION

Because it is difficult to distinguish the top and bottom of
the fuel pump relay connector at the wiring harness,
inspect it by using the triangle mark on the junction block
as a reference.
(1) Disconnect the connector C-208 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 8.
NO : Repair harness wire between fuel pump relay 1

connector C-210 (terminal No. 1) and fuel pump relay
2 connector C-208 (terminal No. 1) because of open
circuit. Then confirm that the malfunction symptom is
eliminated.

2 1

3

4

AK303932

2 1

3

4

AK303932AB

CONNECTOR: C-208

C-208

JUNCTION BLOCK
TRIANGLE MARK

HARNESS CONNECTOR:
COMPONENT SIDE

2 1

3

4

AK302234

C-208 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

JUNCTION
BLOCK
TRIANGLE
MARK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1063

STEP 8. Measure the power supply voltage at fuel pump
relay 2 harness side connector C-208.

CAUTION

Because it is difficult to distinguish the top and bottom of
the fuel pump relay connector at the wiring harness,
inspect it by using the triangle mark on the junction block
as a reference.
(1) Disconnect the connector C-208 and measure at the

harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 3 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 9.
NO : Check harness connector C-215 at intermediate

connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connector is in

good condition, repair harness wire between ignition
switch connector C-308 (terminal No. 2) and fuel
pump relay 2 connector C-208 (terminal No. 3)
because of open circuit. Then confirm that the
malfunction symptom is eliminated.

STEP 9. Check connector D-18 at fuel pump for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

2 1

3

4

AK303932

2 1

3

4

AK303932AB

CONNECTOR: C-208

C-208

JUNCTION BLOCK
TRIANGLE MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK302232

2 1

3

4

C-208 HARNESS

CONNECTOR:

COMPONENT SIDE

AC

JUNCTION
BLOCK
TRIANGLE
MARK

2 1

3

4

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1064

STEP 10. Check the fuel pump operation.
(1) Disconnect fuel pump connector D-18.

(2) Use jumper wires to connect fuel pump connector terminal

No. 5 to the positive battery terminal and terminal No. 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 11.
NO : Replace the fuel pump. Then confirm that the

malfunction symptom is eliminated.

STEP 11. Check for continuity at fuel pump harness side
connector D-18.
(1) Disconnect the connector D-18 and measure at the harness

side.

(2) Check for the continuity between terminal No. 4 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 12.
NO : Repair harness wire between fuel pump connector

D-18 (terminal No. 4) and ground because of open
circuit. or harness damage. Then confirm that the
malfunction symptom is eliminated.

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01439

FUEL PUMP SIDE
CONNECTOR

AB

1 2 3

4 5

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01440AN

1

2

3

4

5

D-18 HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1065

STEP 12. Check for open circuit and short circuit to
ground and harness damage between fuel pump relay 2
connector C-208 (terminal No. 4) and fuel pump connector
D-18 (terminal No. 5).
NOTE: Check harness after checking intermediate connector
C-204. If intermediate connector is damaged, repair or replace
it. After to GROUP 00E, Harness Connector Inspection

P.00E-2

. Then check that the malfunction is eliminated.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

2 1

3

4

AK303932

2 1

3

4

AK303932AB

CONNECTOR: C-208

C-208

JUNCTION BLOCK
TRIANGLE MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE