Mitsubishi 380. Manual - part 488

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-44

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-45

STEP 9. Check for harness damage between MPI relay 
connector B-17X (terminal No. 4) and right bank heated 
oxygen sensor (rear) connector B-08 (terminal No. 4).
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

AK303064

1

2

3

4

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (REAR)

CONNECTOR: B-08

B-08 (GR)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-46

STEP 10. Check for harness damage between right bank 
heated oxygen sensor (reart) connector B-08 (terminal No. 
3) and ENGINE-ECU connector B-20 (terminal No. 32).
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 P0037 set?

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

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

AK303064

1

2

3

4

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (REAR)

CONNECTOR: B-08

B-08 (GR)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-47

DTC P0038: Heated Oxygen Sensor Heater Circuit high (bank 1, sensor 2).

.

CIRCUIT OPERATION

• Power is supplied from the MPI relay (terminal 

No. 4) to the right bank heated oxygen sensor 
(rear) heater.

• The ENGINE-ECU (terminal No. 32) controls 

continuity to the right bank heated oxygen sensor 
(rear) heater by turning the power transistor in the 
ENGINE-ECU "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• The ENGINE-ECU checks whether the heater 

current is within a specified range when the 
heater is energized.

.

DTC SET CONDITIONS

Check Conditions

• Battery voltage is within 9.04 to 16.01 volts.

• Engine speed is above 801 r/min.

Judgment Criteria

• IC internal test (short circuit to battery).

• MIL is activated after 2 Driving Cycles.

• No limp home mode.

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

AK303014

CONNECTOR: B-17X

MFI RELAY

MFI RELAY

FRONT OF VEHICLE

B-17X

AB

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

AK303063

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (REAR)

CONNECTOR: B-08

B-08 (GR)

AB