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Mitsubishi Grandis. Manual - part 866

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-131

2. Use the jumper leads to connect A/T control relay

terminal 2 to the negative battery terminal and
terminal 3 to the positive battery terminal.

3. Check the continuity between A/T control relay

connector terminals 1 and 4 while alternately
connecting and disconnecting the jumper leads
from the battery terminals.

4. If there is a malfunction, replace the A/T control

relay.

A/T CONTROL SOLENOID VALVE
ASSEMBLY CHECK

M1231009400320

1. Use the MUT-III to measure the ATF temperature

and check that the ATF temperature is 20

°C.

2. Disconnect the A/T control solenoid valve

assembly connector.

3. Measure the resistance between the solenoid

valve terminals.

4. Check that the measured values are within the

standard values at items 1 and 3.

Standard value:

5. If within the standard value, check the power

supply and the earth circuits.

6. If not within the standard value, drain the ATF and

remove the valve body cover.

7. Disconnect the solenoid valve connectors.

8. Measure the resistance between terminals 1 and

2 at each solenoid valve side.

Standard value: 2.7

− 3.4 Ω (A/T fluid

temperature 20

°C)

9. If not within the standard value, replace the

solenoid valve.

10.If within the standard value, check the harness

wire between A/T control solenoid valve assembly
connector and each solenoid valve connector. If a
problem is not found at the steps above, check
the solenoid valve O-rings and replace if
necessary.

A/T FLUID TEMPERATURE SENSOR
CHECK

M1231004500300

1. Drain the ATF and remove the valve body cover.

Jumper leads

Continuity between
terminals 1 and 4

Connected

Less than 2

Ω

Disconnected

Open circuit

AC100115

1 2
3 4

AC303628AE

Transmission
mount

A/T control
solenoid valve
assembly connector

Name

Terminal
No.

Resistance
value

Damper clutch control
solenoid valve

− 10

2.7

− 3.4 Ω

(A/T fluid
temperatur
e 20

°C)

Low-reverse solenoid valve 6

− 10

Second solenoid valve

− 9

Underdrive solenoid valve

− 9

Overdrive solenoid valve

− 9

AC002219

solenoid

valve

solenoid

valve

solenoid

valve

2ND

solenoid

valve

DCC

solenoid

valve

AC002289

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-132

2. Remove the A/T fluid temperature sensor.

3. Measure the resistance between A/T control

solenoid valve assembly connector terminals 1
and 2.

Standard value:

NOTE: The A/T fluid temperature warning lamp
on the combination meter flashes when the
temperature reaches approximately 125

C or

higher and then stops flashing when the
temperature drops below approximately 115

4. If the A/T fluid temperature sensor resistance and

the temperature when the N range indicator is
flashing or switched off are outside the standard
value ranges, replace the A/T fluid temperature
sensor.

TORQUE CONVERTER STALL TEST

M1231005400425

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-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.

Fluid temperature
(

°C)

Resistance value (

Ω)

16.7

− 20.5

7.3

− 8.9

3.4

− 4.2

1.9

− 2.2

1.0

− 1.2

100

0.57

− 0.69

AC002219CF

A/T fluid
temperature
sensor

AC103441

ATF

AC001824AC

Reverse
clutch

Low-reverse
brake

Underdrive
clutch

Torque
converter

Second brake

Overdrive
clutch

One-way
clutch

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-133

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

HYDRAULIC PRESSURE TESTS

M1231005500455

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.

AC006150

<Under side view>

Valve body cover

MD998332

MD998330

AC006149

MD998332

MD998330

Valve body cover

AC006151AC

MD998900

MD998330

Valve body
cover

ON-VEHICLE SERVICE

AUTOMATIC TRANSMISSION (FF)

23A-134

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.

Content .. 864 865 866 867 ..