Mitsubishi Galant (2004+). Manual — part 687
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-299
INSPECTION PROCEDURE 8: Shift Shock when Shifting from "N" to "D," "N" to "R" and Long Delay
.
COMMENT
If abnormal shock or delay of two seconds or more
occurs when the selector lever is moved from "N" to
"D" range or from "N" to "R" range while the engine is
idling, the cause is probably abnormal line pressure
or a malfunction of the oil pump or valve body.
.
TROUBLESHOOTING HINTS (The most likely
causes for this condition:)
• Abnormal line pressure
• Malfunction of the oil pump
• Malfunction of the valve body
• Malfunction of the PCM
DIAGNOSIS
STEP 1. Check the hydraulic pressure.
(1) 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.
(2) If some elements pressures are within the standard value
and some are not, recheck the symptom.
Q: Are all hydraulic pressures within the standard value?
YES : Go to Step 3.
NO : Go to Step 2.
STEP 2. Adjust line pressure.
Adjust line pressure. Refer to
, Line Pressure Adjust-
ment. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 3.
STEP 3. Check when shift shock occurs.
Q: When does the shift shock occur?
When engaging from "N" to "D" and "N" to "R" : Go to
Step 4.
When the vehicle starts moving : 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
. Then check the
symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 6.
AC001865
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-300
STEP 5. Disassemble and clean the valve body.
Check the installation bolts for looseness and the O-ring,
valves and valve body for damage. Repair or replace the faulty
parts. Refer to GROUP 23B, Valve Body
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 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 9: Shift Shock and Slipping
.
COMMENT
If shift shock when driving is due to upshifting or
downshifting and the transaxle speed become higher
than the engine speed, the cause is probably abnor-
mal line pressure or a malfunction of a solenoid
valve, oil pump, valve body or of a brake or clutch.
.
TROUBLESHOOTING HINTS (The most likely
causes for this conditon:)
• Abnormal line pressure
• Malfunction of each solenoid valve
• Malfunction of the oil pump
• Malfunction of the valve body
• Malfunction of each brake or each clutch
• Malfunction of the PCM
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
AC001860 AB
VALVE
BODY
ASSEMBLY
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-301
STEP 1. Using scan tool MB991958, check actuator test.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the actuator test mode for
following items.
a. Item 01: Low-reverse solenoid valve
b. Item 02: Underdrive solenoid valve
c. Item 03: Second solenoid valve
d. Item 04: Overdrive solenoid valve
• An audible clicking or buzzing should be heard when
the solenoid valves are energized.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the solenoid valves operating properly?
YES : Go to Step 2.
NO : Repair or replace the solenoid valves. Refer to
GROUP 23B, Valve Body
that the symptom is eliminated.
STEP 2. Check the hydraulic pressure.
(1) Measure the hydraulic pressure of each element. Check if
each hydraulic pressure is within the standard value. Refer
to
, Hydraulic Pressure Test.
(2) If some elements pressure are within the standard value
and some are not, recheck the symptom.
Q: Are all hydraulic pressures within the standard value?
YES : Go to Step 6.
NO : Go to Step 3.
STEP 3. Adjust the line pressure.
Adjust the line pressure. Refer to
, Line Pressure
Adjustment. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-302
STEP 4. Replace the oil pump.
(1) Remove the transaxle.
(2) Replace the oil pump. (Oil pump can not be repaired). Refer
to GROUP 23B, Transaxle
. Then check the
symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 5.
STEP 5. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body
.
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 7.
STEP 6. Check each brake and clutch.
(1) Remove the transaxle.
(2) Check the facing for seizure and piston seal ring for
damage and interference with retainer. Repair or replace
the faulty parts. Refer to GROUP 23B, Transaxle
Underdrive Clutch and Input Shaft
Overdrive Clutch
. Then Retest the system.
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.
AC001865
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001868
REVERSE
CLUTCH
SECOND
BRAKE
LOW-
REVERSE
BRAKE
UNDERDRIVE
CLUTCH
OVERDRIVE CLUTCH
AB
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