Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 491
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AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-256
STEP 4. 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
.
Q: Is the repair possible and the symptom eliminated?
YES : Diagnosis is complete.
NO : Replace the valve body assembly. Then check the
symptom. If the symptom is not eliminated, go to Step
6.
STEP 5. Check the underdrive clutch.
(1) Remove the transaxle assembly.
(2) Check the facing for seizure and the piston seal ring for
damage and interference with the retainer. Repair or
replace the faulty parts. Refer to GROUP 23B, Underdrive
Clutch and Input Shaft
. Then check the symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 3: Does not Move Backward
COMMENT
If the vehicle does not backward when the selector
lever is shifted from "N" to "R" range while the engine
is idling, the cause is probably abnormal pressure or
a malfunction of the reverse clutch, low-reverse
brake, or valve body.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
•
Abnormal reverse clutch pressure
•
Abnormal low-reverse brake pressure
•
Malfunction of the low-reverse solenoid valve
•
Malfunction of the reverse clutch
•
Malfunction of the low-reverse brake
•
Malfunction of the valve body
•
Malfunction of the PCM
DIAGNOSIS
REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001861
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AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-257
STEP 1. Using scan tool MB991502, check actuator test
item 01: Low-Reverse Solenoid Valve.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to actuator test mode for item 01:
Low-Reverse Solenoid Valve.
•
An operation sound should be heard from solenoid
valve when solenoid valve is operated.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
YES : Go to Step 2.
NO : Repair or replace the low-reverse solenoid valve.
Refer to GROUP 23B, Valve Body
. Then
confirm that the symptom is eliminated.
STEP 2. Check the hydraulic pressure (for reverse clutch).
Measure the hydraulic pressure for reverse clutch when the
selector lever is at the "R" range, and check if the hydraulic
pressure is within the standard value. Refer to
Hydraulic Pressure Test.
Q: Is the hydraulic pressure within the standard value?
YES : Go to Step 3.
NO : Go to Step 5.
STEP 3. Check the hydraulic pressure (for low-reverse
brake).
Measure the hydraulic pressure for low-reverse brake when the
selector lever is at the "R" range, and check if the hydraulic
pressure is within the standard value. Refer to
Hydraulic Pressure Test.
Q: Is the hydraulic pressure within the standard value?
YES : Go to Step 4.
NO : Go to Step 5.
AC001252
MB991502
16 PIN
AB
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AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-258
STEP 4. Check the reverse clutch system and low-reverse
brake system.
(1) Remove the valve body cover and valve body. Refer to
, Transaxle Assembly and GROUP 23B,
(2) Blow compressed air into the reverse clutch oil orifice of the
transaxle case. Then check if the reverse clutch piston
moves and air pressures are maintained in that condition.
Repeat for the low-reverse brake.
Q: Are both air pressures maintained?
YES : Go to Step 5.
NO : Go to Step 6.
STEP 5. 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
.
Q: Is the repair possible and the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 7.
STEP 6. Check the reverse clutch and low-reverse brake.
Remove the transaxle.
Check the facing for seizure and the piston seal ring for
damage and interference with the retainer. Repair or replace
the faulty parts. Refer to GROUP 23B, Transaxle
,
Reverse and Overdrive Clutch
. Then check the
symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 7.
STEP 7. Replace the PCM.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at Step 1.
AC001862
REVERSE CLUTCH
OIL ORIFICE
LOW-REVERSE
BRAKE OIL ORIFICE
AB
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001863 AB
LOW-REVERSE BRAKE
REVERSE CLUTCH
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AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-259
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 A/T 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
Hydraulic Pressure Test. If some elements are within the
standard value and some are not, recheck the symptom.
Q: Are all pressures within the standard value?
YES : Check A/T 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.
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
.
Q: Is the repair possible and the symptom eliminated?
YES : Diagnosis is complete.
NO : Replace the valve body assembly. Then check the
symptom. If the symptom is not eliminated, 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
, Planetary Gear, Output
Shaft, Differential. Then check the symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 5.
AC001860 AB
VALVE
BODY
ASSEMBLY
AC004468AB
PLANETARY GEAR
OUTPUT SHAFT
DIFFERENTIAL
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