Mitsubishi 380. Manual - part 555

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-312

STEP 3. Check the No. 6 cylinder injector.
(1) Disconnect the No.6 cylinder injector connector B-26.

(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 : Go to Step 4.
NO :  Replace the No. 6 cylinder injector. Then go to Step 

10.

AK303116

M

1

2

CONNECTOR: B-26

B-26 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AB

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-313

STEP 4. Measure the power supply voltage at No. 6 
cylinder injector connector B-26.
(1) Disconnect connector B-26 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.

(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 :  Go to Step 5.

STEP 5. 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 injector connector 
B-26 (terminal No. 1) because of open circuit or 
short circuit to ground.

Then go to Step 10.

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

Connector Inspection 

P.00E-2

. Then go to Step 10.

AK303116

M

1

2

CONNECTOR: B-26

B-26 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AB

AK303117

1

2

B-26 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-314

STEP 6. Check for harness damage between MFI relay 
connector B-17X and No. 6 cylinder injector connector 
B-26 (terminal No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair it. Then go to Step 10.

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

RELAY BOX

AK303116

M

1

2

CONNECTOR: B-26

B-26 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MFI)

13A-315

STEP 7. Check harness connector B-20 at ECU for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 10.

STEP 8. Check for open circuit and short circuit to ground 
and harness damage between No. 6 cylinder injector 
connector B-26 (terminal No. 2) and ECU connector B-20 
(terminal No. 17).
Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO :  Repair it. Then go to Step 10.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

AK303116

M

1

2

CONNECTOR: B-26

B-26 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AB

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER