Mitsubishi 380. Manual - part 491

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-56

STEP 7. Check for open circuit or short circuit to ground 
between left bank heated oxygen sensor (front) connector 
B-25 (terminal No. 4) and ENGINE-ECU connector B-20 
(terminal No. 48).
Q: Is the harness wire in good condition?

YES : Then go to Step 8.
NO :  Repair it. Then go to Step 11.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

AK303071

1

2

3

4

LEFT BANK

HEATED OXYGEN

SENSOR (FRONT)

CONNECTOR: B-25

B-25 (B)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-57

STEP 8. Check harness connector B-20 at ENGINE-ECU for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 9.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 11. 

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-58

STEP 9. Check for harness damage between MPI relay 
connector B-17X (terminal No. 4) and left bank heated 
oxygen sensor (front) connector B-25 (terminal No. 3).
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO :  Repair it. Then go to Step 11.

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

RELAY BOX

AK303071

1

2

3

4

LEFT BANK

HEATED OXYGEN

SENSOR (FRONT)

CONNECTOR: B-25

B-25 (B)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-59

STEP 10. Check for harness damage between left bank 
heated oxygen sensor (front) connector B-25 (terminal No. 
4) and ENGINE-ECU connector B-20 (terminal No. 48).
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 11.

STEP 11. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− EOBD Drive Cycle − 

P.13A-11

.

(2) Check the diagnostic trouble code (DTC).

Q: Is DTC P0051 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

AK303071

1

2

3

4

LEFT BANK

HEATED OXYGEN

SENSOR (FRONT)

CONNECTOR: B-25

B-25 (B)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE