Mitsubishi 380. Manual - part 404

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-156

STEP 4. Measure the Second solenoid valve resistance at 
A/T control solenoid valve assembly connector B-108.
(1) Disconnect connector B-108 and measure at the solenoid 

valve side.

(2) Measure the resistance between solenoid valve assembly 

connector B-108 terminals 4 and 9.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)]?

YES : Go to Step 6.
NO :  Go to Step 5.

STEP 5. Measure the solenoid valve resistance at the 
second solenoid valve assembly inside the transmission.
(1) Disconnect connector B-108-2 and measure at the solenoid 

valve side.

(2) Measure the resistance between Second solenoid valve 

terminals 1 and 2.

Resistance value: 2.7

−3.4 Ω [at 20°C (68°F)]

Q: Is the measured resistance 2.7

−3.4 Ω [at 20°C (68°F)?

YES : Replace the harness wire between A/T control 

solenoid valve assembly connector B-108 and the 
solenoid valves.

NO :  Replace the Second solenoid valve. Refer to GROUP 

23B, Valve Body 

23B-62

.

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AC210690

2

7

1

8

3

9

4

6

10

5

AB

B-108 HARNESS CONNECTOR: 
A/T CONTROL SOLENOID VALVE 
ASSEMBLY SIDE

VALVE BODY
ASSEMBLY

10DB108A

CONNECTORS:  B-108-2     

B-108-2

2

1

AC201141

B-108-2 HARNESS CONNECTOR: 
SECOND 
SOLENOID VALVE SIDE

BB

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-157

STEP 6. Check A/T-ECU connector B-22 and A/T control 
solenoid valve assembly connector B-108 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 7.
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

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-158

STEP 7. Check the harness for an open or short circuit to 
ground between A/T-ECU connector B-22 terminal 14 and 
A/T control solenoid valve assembly connector B-108 
terminal 4.
Q: Is the harness wire in good condition?

YES : Replace the A/T-ECU.
NO :  Repair or replace the harness wire.

16DB564A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTORS:  B-19, B-22

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-159

STEP 8. Measure the supply voltage at A/T control 
solenoid valve assembly connector B-108.
(1)  Disconnect solenoid valve assembly harness connector 

B-108.

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

(3) Measure the voltage between harness connector B-108 

terminal 9 and ground.

• The voltage should equal battery positive voltage.

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

Q: Is the measured voltage battery positive voltage?

YES : Go to Step 11.
NO :  Go to Step 9.

STEP 9. Check A/T control relay connector B-16X in the 
engine component relay box and A/T control solenoid 
valve assembly connector B-108 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 damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5

AC210680

2

5

6

10

4

9

3

8

1

7

AB

B-108 HARNESS 
CONNECTOR: 
COMPONENT SIDE

10DB098A

RELAY BOX

CONNECTOR: B-16X

 

2

1

3 4

FRONT OF
VEHICLE

AC306322

CONNECTOR: B-108

B-108 (GR)

AC

TRANSMISSION
RANGE SWITCH

2

7

1

8

3

9

4

6

10

5