Mitsubishi Outlander (2003+). Manual — part 214

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-151

TORQUE CONVERTER STALL TEST

M1231005400403

The purpose of this test is to measure the maximum
engine speed when the torque converter stalls in D
or R ranges in order to check the torque converter
(Stator and one-way clutch operation) and the
holding performance of the clutches and brakes
which are built into the transmission.

WARNING

For safety, the front and rear of the vehicle
should be kept clear of other people while
this test is being carried out.

1. Check the A/T fluid level, the A/T fluid

temperature and the engine coolant temperature.

•

A/T fluid level: HOT position on oil level gauge

•

A/T fluid temperature: 70

−

80

°

C

•

Engine coolant temperature: 80

−

100

°

C

NOTE: The A/T fluid temperature is measured
with MUT-II/III.

2. Place wheel locks on both the left and right front

wheels.

3. Pull the parking brake lever to apply the parking

brake and depress the brake pedal fully.

4. Start the engine.

CAUTION

•

Do not keep the throttle fully open for any
longer than 5 seconds.

•

If you repeat the stall test when the A/T fluid
temperature is greater than 80

°

C, move the

selector lever to the "N" position and let the
engine run at approximately 1,000 r/min for at
least one minute. Wait until the A/T fluid
temperature returns to 80

°

C or less.

5. Move the selector lever to the D position, fully

depress the accelerator pedal and quickly take a
reading of the maximum engine speed at this
time.

Standard stalling engine speed: 2, 300

−

2,

800 r/min

6. Move the selector lever to the R position and

repeat the test described above.

Standard stalling engine speed: 2, 300

−

2,

800 r/min

TORQUE CONVERTER STALL TEST
JUDGMENT RESULTS

1. Stall speed is too high in both D and R ranges

•

Malfunction of the torque converter (Slippage
on the splines of the torque converter and the
input shaft)

•

Low line pressure

•

Low-reverse brake slippage and malfunction
of the one-way clutch

2. Stall speed is too high in D range only

•

Underdrive clutch slippage

3. Stall speed is too high in R range only

•

Reverse clutch slippage

4. Stall speed is too low in both D and R ranges

•

Malfunction of the torque converter (Slippage
of the one-way clutch)

•

Low line pressure

•

Poor engine output

AC001824AC

Reverse
clutch

Low-reverse
brake

Underdrive
clutch

Torque
converter

Second brake

Overdrive
clutch

One-way
clutch

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-152

HYDRAULIC PRESSURE TESTS

M1231005500433

CAUTION

The transmission fluid temperature should be
between 70

−

80

°

C during the test.

1. Check the transmission fluid level, temperature

and engine coolant temperature.

•

Transmission fluid level: HOT mark on the
dipstick

•

Transmission fluid temperature: 70

−

80

°

C

•

Engine coolant temperature: 80

−

100

°

C

2. Raise the vehicle so that the wheels are free to

turn.

3. Connect the special tools (oil pressure gauge (3.0

MPa) [MD998330] and adapters [MD998332,
MD998900]) to each pressure discharge port.
NOTE:

.

•

2ND: Second brake pressure port

•

UD: Underdrive clutch pressure port

•

LR: Low-reverse brake pressure port

•

DR: Torque converter release pressure port

•

DA: Torque converter apply pressure port

•

RV: Reverse clutch pressure port

•

OD: Overdrive clutch pressure port

4. Restart the engine.
5. Check that there are no leaks around the special

tool port adapters.

6. Measure the hydraulic pressure at each port

under the conditions given in the standard
hydraulic pressure table, and check that the
measured values are within the standard value
ranges.

7. If the pressure is not within the standard value,

stop the engine and refer to the hydraulic
pressure test diagnosis table.

8. Remove the O-ring from the port plug and replace

it.

9. Remove the special tool, and install the plugs to

the hydraulic pressure ports.

10.Start the engine and check that there are no leaks

around the plugs.

AC006150

<Under side view>

Valve body cover

MD998332

MD998330

AC

AC006149

MD998332

MD998330

Valve body cover

AC

AC006151AC

MD998900

MD998330

Valve body
cover

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-153

STANDARD HYDRAULIC PRESSURE
TABLE

NOTE: When the torque converter pressure is measured, the engine speed should be 1,500 r/min or less.

HYDRAULIC PRESSURE TEST DIAGNOSIS TABLE

Measurement condition

Standard hydraulic pressure MPa

Selecto
r lever
positio
n

Shift
position

Engine
speed
(r/min)

Underdriv
e clutch
pressure
[UD]

Reverse
clutch
pressure
[RV]

Overdrive
clutch
pressure
[OD]

Low-
reverse
brake
pressure
[LR]

Second
brake
pressure
[2ND]

Torque
converter
pressure
[DR]

P

−

2,500

−

−

−

0.31

−

0.39

−

0.22

−

0.36

R

Reverse 2,500

−

1.27

−

1.77

−

1.27

−

1.77

−

0.50

−

0.70

N

−

2,500

−

−

−

0.31

−

0.39

−

0.22

−

0.36

Sport
mode

1st gear

2,500

0.95

−

1.06

−

−

0.95

−

1.06

−

0.50

−

0.70

2nd gear 2,500

0.95

−

1.06

−

−

−

1.01

−

1.05 0.50

−

0.70

3rd gear 2,500

0.78

−

0.88

−

0.78

−

0.88

−

−

−

4th gear

2,500

−

−

0.78

−

0.88

−

0.78

−

0.88

−

Trouble symptom

Probable cause

All hydraulic pressures are high.

Malfunction of the regulator valve

All hydraulic pressures are low.

Malfunction of the oil pump
Clogged internal oil filter
Clogged oil cooler
Malfunction of the regulator valve
Malfunction of the relief valve
Incorrect valve body installation
Improperly installed solenoid valves
Damaged solenoid valve O-rings

Hydraulic pressure is abnormal in reverse
gear only.

Malfunction of the regulator valve
Clogged orifice
Incorrect valve body installation

Hydraulic pressure is abnormal in 3rd or 4th
gear only.

Malfunction of the overdrive solenoid valve
Malfunction of the overdrive pressure control valve
Malfunction of the regulator valve
Malfunction of the switch valve
Clogged orifice
Incorrect valve body installation

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-154

Only underdrive clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal K
Malfunction of the oil seal L
Malfunction of the oil seal M
Malfunction of the underdrive solenoid valve
Malfunction of the underdrive pressure control valve
Malfunction of the check ball
Clogged orifice
Incorrect valve body installation
Malfunction of the accumulator for underdrive clutch

Only reverse clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal A
Malfunction of the oil seal B
Malfunction of the oil seal C
Clogged orifice
Incorrect valve body installation

Only overdrive clutch hydraulic pressure is
abnormal.

Malfunction of the oil seal D
Malfunction of the oil seal E
Malfunction of the oil seal F
Malfunction of the overdrive solenoid valve
Malfunction of the overdrive pressure control valve
Malfunction of the check ball
Clogged orifice
Incorrect valve body installation
Malfunction of the accumulator for overdrive clutch

Only low-reverse brake hydraulic pressure is
abnormal.

Malfunction of the oil seal I
Malfunction of the oil seal J
Malfunction of the low-reverse solenoid valve
Malfunction of the low-reverse pressure control valve
Malfunction of the switch valve
Malfunction of the fail safe valve A
Malfunction of all the check balls
Clogged orifice
Incorrect valve body installation
Malfunction of the accumulator for low-reverse brake

Trouble symptom

Probable cause