Mitsubishi 380. Manual - part 578

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-404

STEP 5. Check intermediate connector A-13 and MPI relay 
connector B-17X for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 6.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 6. Check the harness for open circuit or short circuit 
to ground between the MPI relay connector B-17X terminal 
1 and the intermediate connector A-13 terminal 5.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair or replace the harness wire.

10DB083A

A-13 (GR)

CONNECTOR: A-13

1

4

7

8

2 3

5

13 14

17

15

12

16

11

10

9

6

1

2

3

4

AK303017

CONNECTOR: B-17X

FRONT OF VEHICLE

B-17X

AB

HARNESS

CONNECTOR:

COMPONENT SIDE

RELAY BOX

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-405

STEP 7. Measure the ENGINE-ECU to speed sensor, output 
voltage at the vehicle speed sensor connector B-121.
(1) Disconnect connector B-121 from the speed sensor and 

measure voltage at the harness side.

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

(3) Measure the voltage between terminal 3 and ground.

• The voltage should measure between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 9.
NO :  Go to Step 8.

STEP 8. Check intermediate connector A-13 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is the connector and terminals in good condition?

YES : Go to Step 9.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

CONNECTOR:  B-121

    

VEHICLE

SPEED SENSOR
        B-121

03DB234A

03DB235A

B-121 HARNESS

CONNECTOR

10DB083A

A-13 (GR)

CONNECTOR: A-13

1

4

7

8

2 3

5

13 14

17

15

12

16

11

10

9

6

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-406

STEP 9. Measure the ENGINE-ECU output voltage to the 
speed sensor at the ENGINE-ECU connector B-21 by using 
check harness special tool MB992044.
(1) Disconnect all the connectors from the ENGINE-ECU.
(2) Connect special tool MB992044 (check harness) between 

the ENGINE-ECU and the control-side harness connectors.

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

(4) Measure the voltage between connector B-21 (terminal 85) 

and ground.

• The voltage should measure between 4.5 and 4.9 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 10.
NO :  Go to Step 12.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

03DB236A

MB992044 CHECK HARNESS

CONNECTOR:   B-21

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-407

STEP 10. Check ENGINE-ECU connector B-21 and vehicle 
speed sensor connector B-121 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are the connectors in good condition?

YES : Go to Step 11.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

CONNECTOR:  B-121

    

VEHICLE

SPEED SENSOR
        B-121

03DB234A