Mitsubishi Galant. Manual — part 388

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-19

6

Selector lever
position: N (on a
flat and straight
road.)

Selector lever position
and vehicle speed (Each
condition should be
maintained for 10
seconds or more.)
(1)Idling in L range
(Vehicle stopped)
(2)Driving at constant
speed of 10 km/h (6.2
mph) in L position
(3)Driving at constant
speed of 30 km/h (19
mph) in 2 position
(4)Driving at constant
speed of 50 km/h (31
mph) in 3 position
(5)Driving at constant
speed of 50 km/h (31
mph) in D position

Data list No. 63
(2) 1st, (3) 2nd,
(4) 3rd, (5) 4th

Shift
position

-

-

Data list No. 31
(2) 0 %, (3) 100
%, (4) 100 %, (5)
100 %

Low-
reverse
solenoid
valve duty
%

31

Low-reverse
solenoid valve
system (

P.23A-

156

.)

Data list No. 32
(2) 0 %, (3) 0 %,
(4) 0 %, (5) 100
%

Underdrive
solenoid
valve duty
%

32

Underdrive
solenoid valve
system (

P.23A-

164

.)

Data list No. 33
(2)100 %, (3) 0
%, (4) 100 %, (5)
0 %

Second
solenoid
valve duty
%

33

Second
solenoid valve
system (

P.23A-

170

.)

Data list No. 34
(2) 100 %, (3)
100 %, (4) 0 %,
(5) 0 %

Overdrive
solenoid
valve duty
%

34

Overdrive
solenoid valve
system (

P.23A-

177

.)

Data list No. 29
(1)0 km/h (0
mph)
(4)50 km/h (31
mph)

Vehicle
speed
sensor

29

Vehicle speed
sensor system
(

P.23A-150

.)

Data list No. 22
(4) 1,600

−

1,900

r/min <2.4L
Engine>
1,300

−

1.600 r/

min <3.0L
Engine>

Input shaft
speed
sensor

22

Input shaft
speed sensor
system (

P.23A-

94

.)

Data list No. 23
(4) 1,600

−

1,900

r/min <2.4L
Engine>
1,300

−

1,600 r/

min <3.0L
Engine>

Output
shaft speed
sensor

23

Output shaft
speed sensor
system (

P.23A-

105

.)

STEP CONDITION

BEFORE TEST/
OPERATION

TEST/OPERATION

STANDARD

INSPECTI
ON ITEM

DTC

INSPECTION
PROCEDURE
PAGE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-20

7

Selector lever
position: 3 (on a
flat and straight
road.)

Selector lever position
and vehicle speed
(1)Driving at speed of 50
km/h (31 mph) in 3rd
gear
(2)Driving at constant
speed of 50 km/h (31
mph)
(3)Release accelerator
pedal (Speed under 50
km/h (31 mph))

Data list No. 36
(2)70

−

90 %

(3)70

−

90 %

→

0

%

Torque
converter
clutch
solenoid
valve duty
%

36,
52,
53

Torque
converter
clutch solenoid
system (

P.23A-

184

,

P.23A-

201

,

P.23A-

206

.)

Data list No. 52
(2)

−

10 to 10 r/

min
(3)

−

300 to

−

100

or 100 to 300 r/
min

Torque
converter
clutch
amount of
slippage

8

Use the scan
tool (MUT-II) to
stop the
INVECS-II
function.
Selector lever
position: D (on a
flat and straight
road.)

Monitor data list No. 11,
23, and 63 with the scan
tool (MUT-II).
(1)Accelerate to 4th gear
at a throttle position
sensor output of 1.5V
(accelerator opening
angle of 30 %).
(2)Slowly decelerate to a
stop.
(3)Accelerate to 4th gear
at a throttle position
sensor output of 2.5 V
(accelerator opening
angle of 50%).
(4)While driving at 60
km/h (37 mph) in 4th
gear, shift down to 3
range.
(5)While driving at 40
km/h (25 mph) in 3rd
gear, shift down to 2
range.
(6)While driving at 20
km/h (12 mph) in 2nd
gear, shift down to L
range.

For (1), (2) and
(3), the reading
should be the
same as the
specified output
shaft speed, and
no abnormal shift
shocks should
occur.
For (4), (5) and
(6), downshifting
should occur
immediately after
moving the
selector lever.

Malfunction
when
shifting

-

Shift shocks
and slipping
(

P.23A-233

.)

Does not
shift
according
to
instructions

-

Early or late
shifting in all
gears (

P.23A-

234

.)

-

Early or late
shifting in
some gears
(

P.23A-237

.)

Does not
shift

-

No diagnostic
trouble code
(

P.23A-239

.)

22

Input shaft
speed sensor
system (

P.23A-

94

.)

23

Output shaft
speed sensor
system (

P.23A-

105

.)

STEP CONDITION

BEFORE TEST/
OPERATION

TEST/OPERATION

STANDARD

INSPECTI
ON ITEM

DTC

INSPECTION
PROCEDURE
PAGE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-21

8

Use the scan
tool (MUT-II) to
stop the
INVECS-II
function.
Selector lever
position: D (on a
flat and straight
road.)

Monitor data list No. 11,
23, and 63 with the scan
tool (MUT-II).
(1)Accelerate to 4th gear
at a throttle position
sensor output of 1.5V
(accelerator opening
angle of 30 %).
(2)Slowly decelerate to a
stop.
(3)Accelerate to 4th gear
at a throttle position
sensor output of 2.5 V
(accelerator opening
angle of 50%).
(4)While driving at 60
km/h (37 mph) in 4th
gear, shift down to 3
range.
(5)While driving at 40
km/h (25 mph) in 3rd
gear, shift down to 2
range.
(6)While driving at 20
km/h (12 mph) in 2nd
gear, shift down to L
range.

For (1), (2) and
(3), the reading
should be the
same as the
specified output
shaft speed, and
no abnormal shift
shocks should
occur.
For (4), (5) and
(6), downshifting
should occur
immediately after
moving the
selector lever.

Does not
shift from 1
to 2 or 2 to
1

31

Low-reverse
solenoid valve
system (

P.23A-

156

.)

33

Second
solenoid valve
system (

P.23A-

170

.)

41

1st gear
incorrect ratio
(

P.23A-192

.)

42

2nd gear
incorrect ratio
(

P.23A-192

.)

Does not
shift from 2
to 3 or 3 to
2

33

Second
solenoid valve
system (

P.23A-

170

.)

34

Overdrive
solenoid valve
system (

P.23A-

177

.)

42

2nd gear
incorrect ratio
(

P.23A-192

.)

43

3rd gear
incorrect ratio
(

P.23A-192

.)

Does not
shift from 3
to 4 or 4 to
3

32

Underdrive
solenoid valve
system (

P.23A-

164

.)

33

Second
solenoid valve
system (

P.23A-

170

.)

43

3rd gear
incorrect ratio
(

P.23A-192

.)

44

4th gear
incorrect ratio
(

P.23A-192

.)

STEP CONDITION

BEFORE TEST/
OPERATION

TEST/OPERATION

STANDARD

INSPECTI
ON ITEM

DTC

INSPECTION
PROCEDURE
PAGE

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-22

TORQUE CONVERTER STALL TEST

M1231005400049

This test measures the maximum engine speed when the
selector lever is at the "D" or "R" position and the torque
converter stalls this test the operation of the torque converter,
starter motor and one-way clutch operation and the holding
performance of the clutches and brakes in the transaxle.

WARNING

Do not let anybody stand in front of or behind the
vehicle while this test is being carried out.

1. Check the A/T fluid level and temperature. Check the engine

coolant temperature.

•

A/T fluid level: At the "HOT" mark on the dipstick

•

A/T fluid temperature: 70

−

80

°

C (158 - 176

°

F)

•

Engine coolant temperature: 80

−

100

°

C (176 - 212

°

F

)

2. Chock both rear wheels.

3. Connect a tachometer.

4. Apply the parking and service brakes fully.

5. Start the engine.

6. Move the selector lever to the "D" position. Fully depress the

accelerator pedal and read the maximum engine speed.

CAUTION

•

The throttle should not be left fully open for any more
than eight seconds.

•

If carrying out the stall test two or more times, move the
selector lever to the "N" position and run the engine at
1,000 r/min to let the A/T fluid cool down before
carrying out subsequent tests.

Standard value: Stall speed: 2,100

−−−−

2,600 r/min

7. Move the selector lever to the "R" position and repeat step

6.

Standard value: Stall speed: 2,100

−−−−

2,600 r/min

9

Selector lever
position: N (on a
flat and straight
road.)

Monitor data list No. 22
and No. 23 with the scan
tool (MUT-II).
(1)Move selector lever to
R range, drive at
constant speed of 10 km/
h (6.2 mph).

The ratio
between data list
No. 22 and No.
23 should be the
same as the gear
ratio when
reversing.

Does not
engage

22

Input shaft
speed sensor
system (

P.23A-

94

.)

23

Output shaft
speed sensor
system (

P.23A-

105

.)

46

Reverse gear
incorrect ratio
(

P.23A-192

.)

STEP CONDITION

BEFORE TEST/
OPERATION

TEST/OPERATION

STANDARD

INSPECTI
ON ITEM

DTC

INSPECTION
PROCEDURE
PAGE

AC001824 AB

REVERSE
CLUTCH

LOW-
REVERSE
BRAKE

ONE-WAY
CLUTCH

UNDER-
DRIVE
CLUTCH

TORQUE
CONVERTER

OVERDRIVE
CLUTCH

SECOND
BRAKE