Mitsubishi Galant (2004+). Manual — part 690
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-311
STEP 4. Check the harness for open circuit between PCM
connector B-20 terminal 42 and battery.
Q: Is the harness wire in good condition?
YES : Go to Step 5.
NO : Repair or replace the harness wire.
STEP 5. Using scan tool MB991958, check data list item 61:
Transmission Range Switch.
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 data reading mode.
• Item 61: Transmission Range Switch.
• Move the selector lever to "P," "R," "N," "D" positions
and confirm that the selected transmission range
match the positions shown on scan tool MB991958.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES : Check for the symptom. If the symptom is not
eliminated, replace the PCM.
NO : Refer to
, DTCs 27, 28:
Transmission Range Switch system.
AC306248AH
CONNECTOR: B-20
PCM
AIR
CLEANER
JAE
41
37
32
40
39
23
21 22
35
31
30
26
36
27
43
42
25
24
38
34
29
33
28
B-20
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-312
INSPECTION PROCEDURE 13: Poor Acceleration
.
COMMENT
If acceleration is poor when downshifting occurs
while driving, a malfunction of the engine system or a
brake or clutch may exist.
.
TROUBLESHOOTING HINTS (The most likely
causes for this condition:)
• Malfunction of the engine system
• Malfunction of the clutch system and brake sys-
tem
• Malfunction of the PCM
DIAGNOSIS
STEP 1. Check the engine system.
Refer to GROUP 13A <2.4L Engine>, Diagnosis
− Symptom
Chart
− Poor acceleration
Refer to GROUP 13B <3.8L Engine>, Diagnosis
− Symptom
Chart
− Poor acceleration
Q: Is the inspection result good?
YES : Go to Step 2.
NO : Repair or replace the engine component(s).
STEP 2. Check each brake and clutch.
Perform the torque converter stall test. Refer to
Torque Converter Stall Test. Then retest the system.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 3.
STEP 3. Perform the hydraulic pressure test.
Perform the hydraulic pressure test. Refer to
Hydraulic Pressure Test. Then retest the system.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 4.
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-313
STEP 4. Check each brake system and each clutch system.
(1) Remove the valve body cover and valve body. Refer to
GROUP 23B, Transaxle
.
(2) Blow 108 kPa (15 psi) compressed air into the each brake
oil orifice and clutch oil orifice of the transaxle case, and
check if each brake and each clutch piston move and air
pressure is maintained.
Q: Is the air pressure maintained?
YES : The procedure is complete.
NO : Go to Step 5.
STEP 5. Check each brake system and clutch system.
(1) Remove the transaxle.
(2) Check the facings 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 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Start over at Step 1.
AC001870
LOW-REVERSE BRAKE
OIL ORIFICE
REVERSE CLUTCH
OIL ORIFICE
OVERDRIVE
CLUTCH
OIL ORIFICE
SECOND BRAKE
OIL ORIFICE
UNDERDRIVE
CLUTCH
OIL ORIFICE
AB
AC001868
REVERSE
CLUTCH
SECOND
BRAKE
LOW-
REVERSE
BRAKE
UNDERDRIVE
CLUTCH
OVERDRIVE CLUTCH
AB
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-314
INSPECTION PROCEDURE 14: Vibration
.
COMMENT
If vibration occurs when driving at constant speed or
when accelerating in 4th gear, abnormal torque con-
verter clutch pressure a malfunction of the engine
system, torque converter clutch solenoid, torque con-
verter or valve body may exist.
.
TROUBLESHOOTING HINTS (The most likely
causes for this condition:)
• Abnormal torque converter clutch pressure
• Malfunction of the engine system
• Malfunction of the torque converter clutch sole-
noid
• Malfunction of the torque converter
• Malfunction of the valve body
• 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
STEP 1. Using scan tool MB991958, check actuator test
item 06: Torque Converter Clutch Solenoid Valve.
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.
• Item 06: Torque Converter Clutch Solenoid Valve.
• An audible clicking or buzzing should be heard when
the torque converter clutch solenoid valve is ener-
gized.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
YES : Go to Step 2.
NO : Repair or replace the torque converter clutch solenoid
valve. Refer to GROUP 23B, Valve Body
.
Then confirm that the symptom is eliminated.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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