Mitsubishi 380. Manual - part 485

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-32

STEP 9. Check for harness damage between MPI relay 
connector B-17X (terminal No. 4) and right bank heated 
oxygen sensor (front) connector B-09 (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

1

2

3

4

AK303048

B-09 (B)

CONNECTOR: B-09

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (FRONT)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-33

STEP 10. Check for harness damage between right bank 
heated oxygen sensor (front) connector B-09 (terminal No. 
4) and ENGINE-ECU connector B-20 (terminal No. 47).
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 P0031 set?

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

1

2

3

4

AK303048

B-09 (B)

CONNECTOR: B-09

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (FRONT)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-34

DTC P0032: Heated Oxygen Sensor Heater Circuit high (bank 1, sensor 1).

.

CIRCUIT OPERATION

• Power is supplied from the MPI relay (terminal 

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

• The ENGINE-ECU (terminal No. 47) controls 

continuity to the right bank heated oxygen sensor 
(front) 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 10.7 to 16.1 volts.

• Engine speed is above 20 r/min.

• Engine starting sequence is completed.

• Oxygen sensor heater is active.

Judgment Criteria

• Heater voltage is above 3.6 Volts during the cali-

brated time interval.

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

AK303047

B-09 (B)

CONNECTOR: B-09

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (FRONT)

AB

MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS

MULTIPOINT FUEL INJECTION (MPI)

13A-35

• MIL is activated after 2 Driving Cycles.

• No limp home mode.

.

EOBD DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− EOBD Drive Cycle − 

P.13A-11

.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this code to be set are: )

• Right bank heated oxygen sensor (front) failed.

• Short circuit to 12 Volt.

• Connector damaged.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

•  Diagnostic tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB992044:  ENGINE-ECU Check Harness

STEP 1. Check harness connector B-09 at the right bank 
heated oxygen sensor (front) for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 4.

1

2

3

4

AK303048

B-09 (B)

CONNECTOR: B-09

THROTTLE BODY

RIGHT BANK

HEATED OXYGEN

SENSOR (FRONT)

AB

HARNESS

CONNECTOR:

COMPONENT SIDE