Mitsubishi 380. Manual - part 553

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-304

STEP 3. Check the No. 5 cylinder injector resistance at 
intermediate connector B-32.
(1) Disconnect the intermediate connector B-32.

(2) Measure the resistance between terminal No. 4 and No. 9.

• Resistance should be between 10.5 and 13.5 ohms.

Q: Is the measured resistance between 10.5 and 13.5 

ohms?
YES : Go to Step 6.
NO :  Go to Step 4.

STEP 4. Check the harness connector B-04 at No. 5 
cylinder injector for damage.
Remove the intake manifold.

Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:

COMPONENT SIDE

AB

B-32 (B)

1 2 3
6 7 8

4 5
9 10

AK303113

B-32 

INTERMEDIATE

CONNECTOR

AB

AK303114

M

1

2

CONNECTOR: B-04

AB

B-04 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-305

STEP 5. Check the No.5 cylinder injector.
(1) Disconnect the No. 5 cylinder injector connector B-04.

(2) Measure the resistance between injector side connector 

terminal No. 1 and No. 2.

Standard value: 10.5 

− 13.5 ohms [at 20°C (68°F)]

Q: Is the measured resistance between 10.5 and 13.5 ohms 

[at 20

°C (68°F)]?

YES : Repair harness wire between intermediate connector 

B-32 (terminal No. 9) and injector connector B-04 
(terminal No. 1) and harness wire between No. 5 
cylinder injector connector B-04 (terminal No. 2) 
and intermediate connector B-32 (terminal No. 4) 
because of open circuit or short circuit to ground 
or harness damage. 

Then go to Step 12.

NO :  Replace the No. 5 cylinder injector. Then go to Step 

12.

AK303114

M

1

2

CONNECTOR: B-04

AB

B-04 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-306

STEP 6. Measure the power supply voltage at intermediate 
connector B-32.
(1) Disconnect the connector B-32 and measure at the female 

connector side.

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

(3) Measure the voltage between terminal No. 9 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 8.
NO :  Go to Step 7.

STEP 7. Check harness connector B-17X at MFI relay for 
damage.
Q: Is the harness connector in good condition?

YES : Repair harness wire between MFI relay connector 

B-17X (terminal No. 4) and intermediate connector 
B-32 (terminal No. 9) because of open circuit or short 
circuit to ground. Then go to Step 12.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:

COMPONENT SIDE

AB

B-32 (B)

3

4

5

8

9

1

2

6

7

10

AK203172

B-32 HARNESS 

CONNECTOR: 

COMPONENT

SIDE

AB

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

RELAY BOX

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-307

STEP 8. Check for harness damage between MFI relay 
connector B-17X (terminal No. 4) and intermediate 
connector B-32 (terminal No. 9).
Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO :  Repair it. Then go to Step 12.

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

RELAY BOX

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:

COMPONENT SIDE

AB

B-32 (B)