Mitsubishi 380. Manual - part 380

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-60

STEP 6. Measure the A/T-ECU output voltage to the speed 
sensor at the 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 A/T-ECU connector B-22 

(terminal 5) 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 7.
NO :  Go to Step 9.

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

10DB086A

B-22  CONNECTOR:

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-61

STEP 7. Check A/T-ECU connector B-22 and input shaft 
speed sensor connector B-109 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are the connectors in good condition?

YES : Go to Step 8.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

AC305354

TRANSMISSION
RANGE SWITCH

B-109 (GR)

AC  

CONNECTOR: B-109

1

3

2

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-62

STEP 8. Check the harness for open circuit or damage 
between A/T-ECU connector B-22 terminal 5 and input 
shaft speed sensor connector B-109 terminal 2.
Q: Is the harness wire in good condition?

YES : Go to Step 19.
NO :  Repair or replace the harness wire.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

AC305354

TRANSMISSION
RANGE SWITCH

B-109 (GR)

AC  

CONNECTOR: B-109

1

3

2

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-63

STEP 9. Check A/T-ECU connector B-22 and input shaft 
speed sensor connector B-109 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 10.
NO :  Repair or replace the damages components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

AC305354

TRANSMISSION
RANGE SWITCH

B-109 (GR)

AC  

CONNECTOR: B-109

1

3

2