Mitsubishi Galant (2004+). Manual - part 1055

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1037

STEP 3. Check the fuel pump relay 1 and 2.

CAUTION

Because it is not possible to distinguish the top and the 
bottom of the fuel pump relay, inspect it with the triangle 
mark printed on the relay facing upward.
(1) Remove the fuel pump relay 1 and 2.

(2) Check for continuity between the each fuel pump relay 

terminals No. 2 and No. 3.

• There should be continuity. (approximately 70 ohms)

(3) Use jumper wires to connect each fuel pump relay terminal 

No. 3 to the positive battery terminal and terminal No. 2 to 
the negative battery terminal.

(4) Check for continuity between the each fuel pump relay 

terminals No. 1 and No. 4 while connecting and 
disconnecting the jumper wire at the negative battery 
terminal.

• Should be less than 2 ohms. (Negative battery terminal 

connected)

• Should be open loop. (Negative battery terminal discon-

nected)

(5) Install the fuel pump relay 1 and 2.
Q: Is the measured resistance normal?

YES : Go to Step 4.
NO :  Replace the fuel pump relay 1 and/or 2. Then confirm 

that the malfunction symptom is eliminated.

2 1

3

4

AK303930AB

CONNECTORS: C-208, C-210

JUNCTION BLOCK
TRIANGLE MARK

C-208

HARNESS CONNECTOR:
COMPONENT SIDE

C-210

AK104052

2

3 4

1

FUEL PUMP
RELAY SIDE
CONNECTOR

AB

AK104053

1 2
3 4

AB

FUEL PUMP
RELAY SIDE
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1038

STEP 4. Measure the power supply voltage at fuel pump 
relay 1 harness side connector C-210.

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-210 and measure at the 

harness side.

(2) Measure the voltage between terminal No. 4 and ground.

• Voltage should measure battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 5.
NO :  Check harness connector C-214 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 relay 
box and fuel pump relay 1 connector C-210 (terminal 
No. 4) because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

2 1

3

4

AK303931AB

CONNECTOR: C-210

C-210

JUNCTION BLOCK
TRIANGLE MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK302231

2 1

3

4

C-210 HARNESS 

CONNECTOR: 

COMPONENT SIDE

AB

2 1

3

4

JUNCTION 
BLOCK
TRIANGLE 
MARK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1039

STEP 5. Measure the power supply voltage at fuel pump 
relay 1 harness side connector C-210.

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-210 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 6.
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 1 connector C-210 (terminal No. 3) 
because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

2 1

3

4

AK303931AB

CONNECTOR: C-210

C-210

JUNCTION BLOCK
TRIANGLE MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK302232

2 1

3

4

C-210 HARNESS 

CONNECTOR: 

COMPONENT SIDE

AB

JUNCTION
BLOCK
TRIANGLE
MARK

2 1

3

4

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1040

STEP 6. Check for continuity at fuel pump relay 1 harness 
side connector C-210.

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-210 and measure at the 

harness side.

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

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 7.
NO :  Check connector C-211 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 fuel pump 
relay 1 connector C-210 (terminal No. 2) and ground 
because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

2 1

3

4

AK303931AB

CONNECTOR: C-210

C-210

JUNCTION BLOCK
TRIANGLE MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK302233

2 1

3

4

C-210 HARNESS 

CONNECTOR: 

COMPONENT SIDE

JUNCTION

BLOCK

TRIANGLE

MARK

AB

2 1

3

4