Mitsubishi Eclipse. Manual — part 824

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-305

STEP 6. Check the reverse clutch, low-reverse brake or
both. Remove the transaxle.
Check the facing for seizure and the piston seal ring for dam-
age and interference with the retainer. Repair or replace the
faulty parts. Refer to GROUP 23B, Transaxle

P.23B-10

,

Reverse and Overdrive Clutch

P.23B-59

. Then check the

symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 7.

STEP 7. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at Step 1.

INSPECTION PROCEDURE 4: Does not Move (forward or backward)

.

COMMENT
If the vehicle does not move forward or backward
when the selector lever is shifted to any position
while the engine is idling, the cause is probably
abnormal line pressure, or a malfunction of the
power train, oil pump or valve body.

.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

• Abnormal line pressure

• Malfunction of the power train

• Malfunction of the oil pump

• Malfunction of the valve body

• Low transmission fluid level

• Malfunction of the PCM

DIAGNOSIS

STEP 1. Check the hydraulic pressure.
Measure the hydraulic pressure of each element when the
transaxle is in 1st, 2nd or reverse. Check if each hydraulic
pressure is within the standard value. Refer to

P.23A-28

,

Hydraulic Pressure Test. If some elements pressures are within
the standard value and some are not, recheck the symptom.
Q: Are all pressures within the standard value?

YES : Check transmission fluid level and condition. If not

OK, repair or replace as necessary, then recheck
symptom. If OK, go to Step 3.

NO : Go to Step 2.

AC001863 AB

LOW-REVERSE BRAKE

REVERSE CLUTCH

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-306

STEP 2. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body

P.23B-74

.

Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 4.

STEP 3. Check the transaxle power train components.
Disassemble the transaxle and check the planetary carrier and
output shaft, etc. Repair or replace the damaged parts. Refer to
GROUP 23B, Transaxle

P.23B-10

, Planetary Gear

P.23B-64

,

Output Shaft

P.23B-68

, Differential

P.23B-70

. Then check the

symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 5.

STEP 4. Replace the oil pump.
(1) Remove the transaxle.
(2) Replace the oil pump (Oil pump cannot be repaired). Refer

to GROUP 23B, Transaxle

P.23B-10

. Then check the

symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 5.

STEP 5. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at Step 1.

AC001860 AB

VALVE
BODY
ASSEMBLY

AC004468AB

PLANETARY GEAR

OUTPUT SHAFT

DIFFERENTIAL

AC001858

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-307

INSPECTION PROCEDURE 5: Engine Stalls when Moving Selector Lever from "N" to "D" or "N" to "R"

.

COMMENT
If the engine stalls when the selector lever is shifted
from "N" to "D" or "R" range while the engine is idling,
the cause is probably a malfunction of the engine
system, torque converter clutch solenoid valve, valve
body or torque converter (torque converter clutch
malfunction).

.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

• Malfunction of the engine system

• Malfunction of the torque converter clutch sole-

noid

• Malfunction of the valve body

• Malfunction of the torque converter (Malfunction

of the torque converter clutch)

• Malfunction of the PCM

DIAGNOSIS

STEP 1. Check the engine system.
Refer to GROUP 13A <2.4L Engine>, Diagnosis

− Trouble

Symptom Chart

− When the engine is hot, it stalls at idle

P.13A-28

or GROUP 13B <3.0L Engine>, Diagnosis

− Trouble

Symptom Chart

− When the engine is hot, it stalls at idle

P.13B-27

.

Q: Is the inspection result good?

YES : Go to Step 2.
NO : Repair or replace the engine components.

STEP 2. Replace the torque converter clutch solenoid
valve.
Replace the torque converter clutch solenoid valve. Refer to
GROUP 23B, Valve Body

P.23B-74

. Then check the symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 3.

STEP 3. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body

P.23B-74

.

Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 4.

AC001866

AC001860 AB

VALVE
BODY
ASSEMBLY

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-308

STEP 4. Replace the torque converter assembly.
(1) Remove the transaxle.
(2) Replace the torque converter assembly. Refer to GROUP

23B, Transaxle

P.23B-10

. Then check the symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 5.

STEP 5. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at Step 1.

INSPECTION PROCEDURE 6: Shift Shock when Shifting from "N" to "D" and Long Delay

.

COMMENT
If abnormal shock or delay of two seconds or more
occurs when the selector lever is shifted from "N" to
"D" range while the engine is idling, the cause is
probably abnormal underdrive clutch pressure or a
malfunction of the underdrive clutch, valve body or
TP sensor.

.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

• Abnormal underdrive clutch pressure

• Malfunction of the underdrive solenoid valve

• Malfunction of the underdrive clutch

• Malfunction of the valve body

• Malfunction of the TP sensor

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

AC001857