Mitsubishi 380. Manual - part 439

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-296

TRANSMISSION FLUID TEMPERATURE SENSOR 
CHECK

M1231021800133

1. Remove the transmission fluid temperature sensor.
2. Measure the resistance between terminals 1 and 2 of the 

transmission fluid temperature sensor connector.

Standard value:

3. If the transmission fluid temperature sensor resistance is 

outside the specified range and the "N" range indicator light 
is flashing, replace the transmission fluid temperature 
sensor.

NOTE: The "N" range indicator light on the combination 
meter flashes when the temperature reaches approximately 
125

°C (257°F) or greater, and then stops flashing when the 

temperature drops below approximately 115

°C (238°F).

TRANSMISSION INHIBITOR SWITCH CHECK

M1231021600117

 Refer to 

P.23A-294

.

STOPLIGHT SWITCH CHECK

M1231009100192

Refer to GROUP 35A, Brake Pedal 

− Brake Pedal Inspection 

P.35A-25

.

A/T CONTROL RELAY CHECK

M1231009300248

1. Remove the A/T control relay.

TRANSMISSION FLUID 
TEMPERATURE

RESISTANCE

0

°C (32°F)

16.7 

− 20.5 kΩ

20

°C (68°F)

7.3 

− 8.9 kΩ

40

°C (104°F)

3.4 

− 4.2 kΩ

60

°C (140°F)

1.9 

− 2.2 kΩ

80

°C (176°F)

1.0 

− 1.2 kΩ

100

°C (212°F)

0.57 

− 0.69 kΩ

AC210186

2

7

1

8

3

9

4

6

10

5

TRANSMISSION FLUID

AC

AC306283

A/T 
CONTROL 
RELAY

RELAY BOX

AC

BATTERY

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-297

2. Use jumper wires to connect A/T control relay terminal 3 to 

the negative battery terminal and terminal 2 to the positive 
battery terminal.

3. Check for continuity between A/T control relay terminals 1 

and 4 when the jumper wires are connected to and 
disconnected from the battery.

4. If there is any problem with the A/T control relay, replace it.

JUMPER WIRE

CONTINUITY BETWEEN TERMINALS 
NO.1 AND NO.4

Connected

Continuity

Disconnected

No continuity

AC100115

1 2
3 4

FRONT OF VEHICLE

AJ

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-298

SOLENOID VALVE CHECK

M1231009400267

1. Use diagnostic tool MB991958 (MUT-III sub assembly) to 

measure the transmission fluid temperature. The desired 
transmission fluid temperature setting for performing the 
solenoid valve check is 20

°C (68°F).

2. Remove the A/T control solenoid valve assembly connector.

3. Measure the resistance between the solenoid valve 

terminals.

4.  The measured resistance of the solenoid valve when the 

transmission fluid temperature is 20

°C (68°F) should match 

the specified resistance on the chart below.

Specified resistance:

5. If the solenoid valve resistance is within the specified range, 

check the power supply and the ground circuits.

6. If the solenoid valve resistance is not within the specified 

range, drain the transmission fluid and remove the valve 
body cover.

7. Disconnect the connector of any solenoid valves that are not 

within the specified range. 

TERMINAL 
NO.

NAME

RESISTANCE

7 - 10

Damper control clutch 
(DCC) solenoid valve

2.7 

− 3.4 Ω [at 

20

°C (68°F)]

6 - 10

Low-reverse solenoid 
valve

8 - 10

Reduction (RED) 
solenoid valve

4 - 9

Second solenoid valve

3 - 9

Underdrive solenoid 
valve

5 - 9

Overdrive solenoid valve

AC306288AB

A/T CONTROL

SOLENOID VALVE

ASSEMBLY

2

7

1

8

3

9

4

6

10

5

10DB123A

Underdrive
solenoid
valve

Second
solenoid
valve

Damper
control clutch
solenoid
valve

Overdrive
solenoid
valve

Low-reverse
solenoid
valve

Reduction (RED)
solenoid
valve

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION

23A-299

8. Measure the resistance between terminals 1 and 2 of any 

solenoid valve that was not within the specified range.

Specified resistance: 2.7 

− 3.4 Ω [at 20°C (68°F)]

9. If the resistance is not within the specified range, replace the 

solenoid valve.

10.If the resistance is within the specified range, check the 

wiring harness between the affected A/T control solenoid 
valve assembly and the solenoid valve. If a problem is not 
found in the above steps, check the solenoid valve O-rings 
and replace them if necessary.

SELECTOR LEVER OPERATION CHECK

M1231001300426

1. Apply the parking brake, and check that the selector lever 

moves smoothly and accurately to each position.

2. Check that the engine starts when the selector lever is at the 

"N" or "P" position, and that it does not start when the 
selector lever is in any other position.

3. Start the engine, release the parking brake, and check that 

the vehicle moves forward when the selector lever is moved 
from "N" position to "D" position or to 1st or 2nd gear in 
Sports mode, and that the vehicle reverses when the 
selector lever is moved to "R" position.

4. Stop the engine.

5. Turn the ignition switch to the "ON" position, and check that 

the backup lamp illuminates when the selector lever is 
shifted from "P" position to "R" position.

TRANSMISSION CONTROL CABLE 
ADJUSTMENT

M1231028000064

1. Move the selector lever to the "N" position.
2. Loosen the upper control lever adjusting nut.

3. Gently push the transmission control cable in the direction of 

the arrow, and then tighten the adjusting nut.

Tightening torque: 12 

± 2 N⋅m (107 ± 17 in-lb)

4. Check that the transmission shifts to the correct range 

corresponding to the position of the selector lever, and that it 
functions correctly in that range.

AC100378

1
2

AB

10DB145A

THE SELECTOR LEVER MOVES WITHOUT 

PUSHING THE BUTTON.

THE SELECTOR LEVER MOVES WHEN THE 

BUTTON IS PUSHED.

10DB143A

12 ± 2 N·m
107 ± 17 in-lb

ADJUSTING NUT

MANUAL
CONTROL
LEVER