Mitsubishi 380. Manual — part 431

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-264

STEP 19. Check A/T-ECU connector B-19 and shift switch
assembly connector D-14 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 20.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

10DB125A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-19

10DB093A

CONNECTOR: D-14

FLOOR

WIRING

HARNESS

4

Y

2

15

ROOF

WIRING

HARNESS

D-14

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-265

STEP 20. Check the harness for open circuit or short
circuit to ground between A/T-ECU connector B-19
terminal 8 and shift switch assembly connector D-14
terminal 7.
Q: Is the harness wire in good condition?

YES : Go to Step 4.
NO : Repair or replace the harness wire.

STEP 21. Check A/T-ECU connector B-19 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 4.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

10DB125A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-19

10DB093A

CONNECTOR: D-14

FLOOR

WIRING

HARNESS

4

Y

2

15

ROOF

WIRING

HARNESS

D-14

10DB125A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-19

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-266

STEP 22. Check the shift switch assembly.
Refer to

P.23A-303

, Transmission Control.

Q: Is the switch operating properly?

YES : Go to Step 23.
NO : Replace the shift switch assembly. Refer to

P.23A-302

, Transmission Control.

STEP 23. Measure the switch output voltage at A/T-ECU
connector B-19 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 terminal 9 and ground.

• The voltage should measure battery positive voltage

when the selector lever is downshift and hold.

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

Q: Is the measured voltage battery positive voltage?

YES : Go to Step 26.
NO : Go to Step 24.

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

10DB130A

B-19 HARNESS

CONNECTOR:

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-267

STEP 24. Check A/T-ECU connector B-19 and shift switch
assembly connector D-14 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 25.
NO : Repair or replace the damaged components. Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

.

10DB125A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-19

10DB093A

CONNECTOR: D-14

FLOOR

WIRING

HARNESS

4

Y

2

15

ROOF

WIRING

HARNESS

D-14