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Mitsubishi 380. Manual - part 434

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-276

ACTUATOR TEST REFERENCE TABLE

M1231008200408

RED SOL
DUTY

Reduction solenoid
valve duty %

Transmission range:
Sport mode
<Vehicles with sport
mode>

Driving at constant
speed of 10 km/h (6.2
mph) in 1st gear

Transmission range:
Sport mode
<Vehicles with sport
mode>

Driving at constant
speed of 30 km/h (19
mph) in 2nd gear

Transmission range:
Sport mode
<Vehicles with sport
mode>

Driving at constant
speed of 50 km/h (31
mph) in 3rd gear

Transmission range:
Sport mode
<Vehicles with sport
mode>

Driving at constant
speed of 50 km/h (31
mph) in 4th gear

100%

Transmission range:
Sport mode
<Vehicles with sport
mode>

Driving at constant
speed of 50 km/h (31
mph) in 5th gear

100%

MUT-III
DIAGNOSTI
C TOOL
DISPLAY

ITEM
NO.

INSPECTION ITEM

INSPECTION
REQUIREMENT

NORMAL
CONDITION

MUT-III
DIAGNOSTI
C TOOL
DISPLAY

ITEM
NO.

INSPECTION
ITEM

TEST CONTENT

INSPECTION
REQUIREMENT

NORMAL
CONDITION

1st SIFT LMP 07

Shift position
indicator light (1st)

Illuminate each indicator
light for three seconds to
the signal from the
diagnostic tool
MB991958 (MUT-III sub
assembly).

• Ignition

switch: ON

• Transmission

range: P

• Engine:

stopped

• Throttle

opening
voltage: Less
than one volt

Shift indicator light
illuminates.

2nd SIFT
LMP

Shift position
indicator light (2
nd)

2ND SOL

Second solenoid
valve

Drive the solenoid valve
specified by the
diagnostic tool
MB991958 (MUT-III sub
assembly) at 50% duty
for five seconds. No
other solenoid valve
should be energized.

The solenoid
should click when
activated

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-277

3rd SIFT LMP 09

Shift position
indicator light (3rd)

illuminate each indicator
light for three seconds to
the signal from the
diagnostic tool
MB991958 (MUT-III sub
assembly).

Shift indicator light
illuminates.

4th SIFT LMP 10

Shift position
indicator light (4th)

5th SIFT LMP 11

Shift position
indicator light (5th)

A/T RELAY

A/T control relay

Actuator test in scope
mode, data list No.54.
Control relay is OFF for
three seconds.

Data list No.54

• During test: 0 V

• Normal: Battery

positive voltage
[12 V]

L/R SOL

Low-reverse
solenoid valve

Drive the solenoid valve
specified by the
diagnostic tool
MB991958 (MUT-III sub
assembly) at 50% duty
for five seconds. No
other solenoid valve
should be energized.

The solenoid
should click when
activated

O/D SOL

Overdrive
solenoid valve

RED SOL

Reduction
solenoid valve

DCC SOL

Damper control
clutch solenoid
valve

U/D SOL

Underdrive
solenoid valve

MUT-III
DIAGNOSTI
C TOOL
DISPLAY

ITEM
NO.

INSPECTION
ITEM

TEST CONTENT

INSPECTION
REQUIREMENT

NORMAL
CONDITION

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-278

A/T-ECU TERMINAL VOLTAGE REFERENCE CHART FOR TRANSMISSION
OPERATION

M1231008400305

1. Disconnect the A/T-ECU connectors, and connect

special tool MB992045 in between.

2. Measure the voltages between each check

connector terminals of special tool MB992045 and
connector B-19 ground terminals 1 or 10.

10DB131A

SPECIAL TOOL A/T- ECU CHECK HARNESS (MB992045) CONNECTOR: COMPONENT SIDE

26-PIN
CONNECTOR
A/T-ECU CONNECTOR
(B-22)

34-PIN
CONNECTOR
A/T-ECU CONNECTOR
(B-19)

10DB132A

COVER

AIR

CLEANER

A/T

CONTROL

UNIT

CONNECTOR: B-22

TERMINAL
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

CONNECTOR
(B-22)

Underdrive solenoid
valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

• Engine: idling

• Transmission range: R

− 9 V

Overdrive solenoid
valve

• Engine: idling

• Gear range: 3rd gear

Battery positive voltage

• Engine: idling

• Transmission range: D (1st gear)

− 9 V

Solenoid valve power
supply

Ignition switch: LOCK (OFF)

1V or less

Ignition switch: ON

Battery positive voltage

AUTOMATIC TRANSMISSION DIAGNOSIS

AUTOMATIC TRANSMISSION

23A-279

A/T control relay

Always

1 V or less

Input shaft speed
sensor

• Measure between (B-22) terminal 5

and (B-19) terminal 1 with an
oscilloscope.

• Engine: 2,000 r/min

• Gear range: 3rd gear

Refer to

P.23A-285

Inspection Procedure
Using an Oscilloscope.

Transmission fluid
temperature sensor

• Ignition switch: ON

• Transmission fluid temperature: 25°C

3.8

− 4.0 V

• Ignition switch: ON

• Transmission fluid temperature: 80°C

2.3

− 2.5 V

Signal ground

Always

1 V or less

Damper control clutch
solenoid valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

• Engine: idling

• Gear range: 3rd gear (60km/h)

− 9 V

Solenoid valve power
supply

Ignition switch: LOCK (OFF)

1 V or less

Ignition switch: ON

Battery positive voltage

Output shaft speed
sensor

• Measure between (B-22) terminal 11

and (B-19) terminal 1 with an
oscilloscope.

• Engine: 2,000 r/min

• Gear range: 3rd gear

Refer to

P.23A-285

Inspection Procedure
Using an Oscilloscope.

Sensor ground

Always

1 V or less

Power supply

Ignition switch: LOCK (OFF)

1 V or less

Ignition switch: ON

Battery positive voltage

Second solenoid valve

• Engine: idling

• Gear range: 2nd gear

Battery positive voltage

• Engine: idling

• Transmission range: D (1st gear)

− 9 V

Reduction solenoid
valve

• Engine: idling

• Gear range: 1st gear

Battery positive voltage

• Engine: idling

• Transmission range: D (5th gear)

− 9 V

Power supply

Ignition switch: LOCK (OFF)

1 V or less

Ignition switch: ON

Battery positive voltage

Low-reverse solenoid
valve

• Engine: idling

• Transmission range: D (1st gear)

Battery positive voltage

• Engine: idling

• Gear range: 2nd gear

− 9 V

Transmission inhibitor
switch: R

• Ignition switch: ON

• Transmission range: R

Battery positive voltage

• Ignition switch: ON

• Transmission range: Other than above

1 V or less

TERMINAL
NO.

INSPECTION ITEM

INSPECTION REQUIREMENT

NORMAL CONDITION

Content .. 432 433 434 435 ..