Mitsubishi Galant 9G. Manual — part 1203

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1112

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.

AK303258

3

4

1

2

3

4

1

2

CONNECTOR: C-210

AB

JUNCTION
BLOCK

C-210

HARNESS
CONNECTOR:
COMPONENT SIDE

1 3

4

2

AK203269

C-210 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

JUNCTION
BLOCK
TRIANGLE
MARK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1113

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.

AK303258

3

4

1

2

3

4

1

2

CONNECTOR: C-210

AB

JUNCTION
BLOCK

C-210

HARNESS
CONNECTOR:
COMPONENT SIDE

1 3

4

2

AK203270

C-210 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

JUNCTION
BLOCK
TRIANGLE
MARK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1114

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.

AK303258

3

4

1

2

3

4

1

2

CONNECTOR: C-210

AB

JUNCTION
BLOCK

C-210

HARNESS
CONNECTOR:
COMPONENT SIDE

1 3

4

2

AK203271

C-210 HARNESS
CONNECTOR:
COMPONENT SIDE

JUNCTION
BLOCK
TRIANGLE
MARK

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1115

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.

3
4

1
2

3
4

1
2

3
4

1
2

AK203272

JUNCTION BLOCK

C-208

HARNESS CONNECTOR:
COMPONENT SIDE

CONNECTOR: C-208

AB

2 1

3

4

AK203273

C-208 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

JUNCTION
BLOCK
TRIANGLE
MARK