Mitsubishi 380. Manual - part 575

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-392

STEP 5. Check harness connector B-17X at MPI relay for 
damage.
Q: Is the harness connector in good condition?

YES : Repair harness wire between MPI relay connector 

B-17X (terminal No. 4) and evaporative emission 
purge solenoid connector F-08 (terminal No. 2) 
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. 

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

RELAY BOX

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-393

STEP 6. Measure the power supply voltage at ECU 
connector B-20 by using engine ECU check harness 
special tool MB992044.
(1) Disconnect the all ECU connectors and connect engine 

ECU check harness special tool MB992044 between the 
separated connectors.

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

(3) Measure the voltage between terminal No. 21 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 9.
NO :  Go to Step 7.

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 12.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB194A

B-20 HARNESS 

CONNECTOR 

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-394

STEP 8. Check for open circuit and short circuit to ground 
between evaporative emission purge solenoid connector 
F-08 (terminal No. 1) and ECU connector B-20 (terminal No. 
21).

Q:Is the harness wire in good condition?

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

STEP 9. Check harness connector B-20 at ECU for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 10.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12. 

03DB193A

F-08

EVAPORATIVE

EMISSION PURGE

SOLENOID

1

2

HARNESS

CONNECTOR:

COMPONENT SIDE

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPORT FUEL INJECTION (MPI)

13A-395

STEP 10. Check for harness damage between MPI relay 
connector B-17X (terminal No. 4) and evaporative emission 
purge solenoid connector F-08 (terminal No. 2).

Q:Is the harness wire in good condition?

YES : Go to Step 11.
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

03DB193A

F-08

EVAPORATIVE

EMISSION PURGE

SOLENOID

1

2

HARNESS

CONNECTOR:

COMPONENT SIDE