Mitsubishi Eclipse. Manual — part 754
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-25
8
Use the scan
tool MB991958
(MUT-III sub
assembly) to
stop the
INVECS-II
function.
Selector lever
position: D (on a
flat and straight
road.)
(1) While driving at
60 km/h (37 mph)
in 4th gear,
downshift to 3rd
gear
(2) While driving at
40 km/h (25 mph)
in 3rd gear,
downshift to 2nd
gear
(3) While driving at
20 km/h (12 mph)
in 2nd gear,
downshift to 1st
gear
Data list No.63
(1) 4th
→ 3rd
(2) 3rd
→ 2nd
(3) 2nd
→ 1st
Does not shift
from 2 to 1
31
Low-reverse
solenoid valve
system
(
33
Second
solenoid valve
system
(
41
1st gear
incorrect ratio
(
42
2nd gear
incorrect ratio
(
Does not shift
from 3 to 2
33
Second
solenoid valve
system
(
34
Overdrive
solenoid valve
system
(
42
2nd gear
incorrect ratio
(
43
3rd gear
incorrect ratio
(
Does not shift
from 4 to 3
32
Underdrive
solenoid valve
system
(
33
Second
solenoid valve
system
(
43
3rd gear
incorrect ratio
(
44
4th gear
incorrect ratio
(
STEP
CONDITION
BEFORE TEST/
OPERATION
TEST/OPERATION
STANDARD
INSPECTION
ITEM
DTC
INSPECTION
PROCEDURE
PAGE
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-26
TORQUE CONVERTER STALL TEST
M1231005400339
This test measures the maximum engine speed when the
selector lever is at the "D" or "R" position and the torque con-
verter stalls. This tests the operation of the torque converter,
stator and one-way clutch operation, as well as the holding per-
formance 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 performed.
1. Check the transmission fluid level and temperature. Check
the engine coolant temperature.
• Transmission fluid level: At the "HOT" mark on the dipstick
• Transmission fluid temperature: 70 − 80°C (158 − 176°F)
• Engine coolant temperature: 80 − 100°C (176 − 212°F)
NOTE: Measures transmission fluid temperature with scan
tool MB991958 (MUT-III sub assembly).
2. Chock both rear wheels.
3. Connect a tachometer.
4. Apply the parking and service brakes fully.
5. Start the engine.
CAUTION
• The throttle should not be left fully open for any more
than five seconds.
• If you repeat the stall test when the transmission fluid
temperature is greater than 80
°C (176°F), 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 transmission fluid temperature returns to
80
°C (176°F) or less.
6. Move the selector lever to the "D" position. Fully depress the
accelerator pedal and read the maximum engine speed.
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
MB991958 (MUT-III
sub assembly).
(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
match
22
Input shaft
speed sensor
system
(
23
Output shaft
speed sensor
system
(
46
Reverse gear
incorrect ratio
(
STEP
CONDITION
BEFORE TEST/
OPERATION
TEST/OPERATION
STANDARD
INSPECTION
ITEM
DTC
INSPECTION
PROCEDURE
PAGE
AC001824 AB
REVERSE
CLUTCH
LOW-
REVERSE
BRAKE
ONE-WAY
CLUTCH
UNDER-
DRIVE
CLUTCH
TORQUE
CONVERTER
OVERDRIVE
CLUTCH
SECOND
BRAKE
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-27
7. Move the selector lever to the "R" position. Fully depress the
accelerator pedal and read the maximum engine speed.
Standard value: Stall speed: 2,100
− 2,600 r/min
TORQUE CONVERTER STALL TEST JUDGEMENT
RESULTS
1. Stall speed is too high in "D" range only
• Malfunction of torque converter (Slippage on the splines of
the torque converter and the input shaft)
• Low line pressure
• Low-reverse brake slippage and malfunction of 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 too low in both "D" and "R" ranges
• Malfunction of torque converter (Slippage of the one-way
clutch)
• Insufficient engine output
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-28
HYDRAULIC PRESSURE TESTS
M1231005500369
CAUTION
The transmission fluid temperature should be between 70
− 80°C (158 − 176°F) during the test.
1. Check the transmission fluid level and temperature. Check
engine coolant temperature.
• Transmission fluid level: "HOT" mark on the dipstick
• Transmission fluid temperature: 70 − 80°C (158 − 176°F)
• Engine coolant temperature: 80 − 100°C (176 − 212°F)
2. Raise the vehicle so that the wheels are free to turn.
3. Connect the special tools (3.0 MPa (427 psi) oil pressure
gauge [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 ("DA" pressure
is approximately the same as the "DR" pressure, so
measurements are not needed)
•
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. Recover 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.
AC006151AB
MD998900
MD998330
VALVE BODY
COVER
AC006149
MD998332
MD998330
VALVE BODY COVER
AB
AC006150
<UNDER SIDE VIEW>
VALVE BODY COVER
MD998332
MD998330
AB
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