Mitsubishi 380. Manual — part 631

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-616

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.

03DB166A

CONNECTOR: C-208, C-210

JUNCTION

BLOCK

HARNESS

CONNECTOR

C-208

C-210

3

4

1

2

3

4

1

2

1 3

4

2

AK203269

C-210 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

JUNCTION

BLOCK

TRIANGLE

MARK

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-617

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.

03DB166A

CONNECTOR: C-208, C-210

JUNCTION

BLOCK

HARNESS

CONNECTOR

C-208

C-210

3

4

1

2

3

4

1

2

1 3

4

2

AK203270

C-210 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

JUNCTION

BLOCK

TRIANGLE

MARK

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-618

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.

03DB166A

CONNECTOR: C-208, C-210

JUNCTION

BLOCK

HARNESS

CONNECTOR

C-208

C-210

3

4

1

2

3

4

1

2

1 3

4

2

AK203271

C-210 HARNESS

CONNECTOR:

COMPONENT SIDE

JUNCTION

BLOCK

TRIANGLE

MARK

AB

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>

13A-619

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

03DB167A

JUNCTION BLOCK

C-208

HARNESS CONNECTOR:

COMPONENT SIDE

CONNECTOR: C-208

2 1

3

4

AK203273

C-208 HARNESS

CONNECTOR:

COMPONENT SIDE

AB

JUNCTION

BLOCK

TRIANGLE

MARK