Mitsubishi 380. Manual - part 418

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-212

STEP 9. Check the harness for open circuit or short circuit 
to ground between A/T control relay connector B-16X 
terminal 2 in the engine component relay box and junction 
block connector C-214 terminal 12.
Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO :  Repair or replace the harness wire.

10DB085A

CONNECTOR: C-214

6

1
7

2

9

8

10

3

5

12

11

4

1314

10DB098A

RELAY BOX

CONNECTOR: B-16X

 

2

1

3 4

FRONT OF
VEHICLE

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-213

STEP 10. Measure the A/T control relay output voltage at 
A/T-ECU connector B-22 by using check harness special 
tool MB992045.
(1) Disconnect all the connectors from the A/T-ECU.

(2) Connect special tool MB992045 (check harness) between 

the A/T-ECU and the body-side harness connector.

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

(4) Measure the voltage between connector B-22 terminal 3 

and ground.

• The measured voltage should equal battery positive 

voltage.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

10DB161A

A/T-ECU CHECK HARNESS
    MB992045

A/T-ECU

A/T-ECU CHECK 
HARNESS
CONNECTORS

10DB120A

B-22 HARNESS 

CONNECTOR:

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-214

(5) Measure the voltage between connector B-22 terminal 9 

and ground.

• The measured voltage should equal battery positive 

voltage.

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

Q: Is the measured voltage equal to battery positive 

voltage between terminal 3 and ground, and between 
terminal 9 and ground?
YES : Go to Step 13.
NO :  Go to Step 11.

STEP 11. Check A/T-ECU connector B-22 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Are the connector and terminals in good condition?

YES : Go to Step 12.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

10DB121A

B-22 HARNESS 

CONNECTOR:

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-215

STEP 12. Check harness for open circuit or short circuit to 
ground between A/T control relay connector B-16X 
(terminal 4) in the engine component relay box and 
A/T-ECU connector B-22 (terminals 3 and 9).
Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO :  Repair or replace the harness wire.

STEP 13. Check A/T-ECU connector B-22 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Are the connector and terminals in good condition?

YES : Go to Step 14.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

10DB098A

RELAY BOX

CONNECTOR: B-16X

 

2

1

3 4

FRONT OF
VEHICLE

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22