Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 492
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-260
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
. Then check the
symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 5.
STEP 5. Replace the PCM.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at Step 1.
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
solenoid
•
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
or GROUP 13B <3.0L Engine>, Diagnosis
−
Trouble
Symptom Chart
−
When the engine is hot, it stalls at idle
Q: Is the inspection result good?
YES : Go to Step 2.
NO : Repair or replace the engine components.
AC001858
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-261
STEP 2. Replace the torque converter clutch solenoid
valve.
Replace the torque converter clutch solenoid valve. Refer to
GROUP 23B, Valve Body
. Then check the symptom.
Q: Is the symptom eliminated?
YES : Diagnosis 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
.
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 4. Replace the torque converter assembly.
(1) Remove the transaxle.
(2) Replace the torque converter assembly. Refer to GROUP
23B, Transaxle
. Then check the symptom.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Go to Step 5.
STEP 5. Replace the PCM.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at Step 1.
AC001866
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001857
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-262
INSPECTION PROCEDURE 6: Shift Shocks when Shifting from "N" to "D" and Long Delay
COMMENT
If abnormal shocks 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
throttle position 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 throttle position sensor
•
Malfunction of the PCM
DIAGNOSIS
REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check actuator test
item 02: Underdrive 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 02:
Underdrive 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 underdrive solenoid valve.
Refer to GROUP 23B, Valve Body
. Then
confirm that the symptom is eliminated.
STEP 2. Check when shift shocks occur.
Q: When the shift shocks occur?
When engaging from N to D : Go to Step 3.
When the vehicle starts moving : Go to Step 6.
STEP 3. Check the hydraulic pressure (for underdrive
clutch).
Measure the hydraulic pressure for underdrive clutch when the
selector lever is shifted from "N" to "D" range. 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 8.
AC001252
MB991502
16 PIN
AB
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-263
STEP 4. Check the underdrive clutch system.
(1) Remove the valve body cover and valve body. Refer to
, Transaxle Assembly and GROUP 23B,
(2) Blow compressed air into the underdrive clutch oil orifice of
the transmission case, and check if the underdrive clutch
piston moves and air pressure is maintained in that
condition.
Q: Is the air pressure maintained?
YES : Go to Step 8.
NO : Go to Step 5.
STEP 5. Check the underdrive clutch.
(1) Remove the transmission 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 9.
STEP 6. Check shift shocks.
Q: Do shift shocks occur?
YES : Go to Step 7.
NO : Go to Step 8.
AC001859
UNDERDRIVE
CLUTCH OIL
ORIFICE
AB
AC001861
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