Mitsubishi Galant 9G. Manual — part 556
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-302
STEP 4. 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 5.
STEP 5. Check the oil pump.
(1) Remove the transaxle.
(2) Check the oil pump (incorrect installation, damage and etc.)
and replace the oil pump assembly if necessary (The oil
pump cannot be disassembly).Refer to GROUP 23B,
Transaxle
. Confirm that the malfunction symptom
is eliminated.
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
, Reverse and
. 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.
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001865
AC001868
REVERSE
CLUTCH
SECOND
BRAKE
LOW-
REVERSE
BRAKE
UNDERDRIVE
CLUTCH
OVERDRIVE CLUTCH
AB
NEXT>>
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-303
23A
INSPECTION PROCEDURE 10: Early or Late Shifting in All Gears
.
COMMENT
If all shift points are early or late while driving, the
cause is probably a malfunction of the output shaft
speed sensor, TP sensor or a solenoid valve.
.
TROUBLESHOOTING HINTS (The most
likely causes for this condition:)
• Malfunction of the output shaft speed sensor
• Malfunction of the TP sensor
• Malfunction of each solenoid valve
• Abnormal line pressure
• 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 data list item 23:
Output Shaft Speed Sensor.
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) Start the engine.
(3) Set scan tool MB991958 to the data reading mode.
• Item 23: Output Shaft Speed Sensor.
• When driving at constant speed of 50km/h (31mph),
the display should be "1,400
− 1,700 r/min" (Gear
range: 3rd gear).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 2.
NO : Refer to
, DTC 23: Output shaft speed
sensor system.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
<<PREVIOUS
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-304
STEP 2. Using scan tool MB991958, check data list item 11:
TP Sensor.
(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 11: TP Sensor.
• With the throttle valve in idle position, voltage should
measure between 300 and 700 mV.
• With the throttle valve in full-open position, voltage
should measure 4,000 mV or more.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 300 and 700 mV at
idle, and 4,000 mV or more at the full-open position?
YES : Go to Step 3.
NO : Check the TP sensor. Refer to GROUP13A <2.4L
Engine>, Diagnostic Trouble Code Procedures
, DTCs P0122, P0123: TP
Sensor System or refer to GROUP13B <3.8L
Engine>, Diagnostic Trouble Code Procedures
, DTCs P0122, P0123: TP
Sensor System. Then check the symptom.
STEP 3. Using scan tool MB991958, check data list.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991958 to the data reading mode for
following items.
a. Item 31: Low-Reverse Solenoid Valve Duty Percent
b. Item 32: Underdrive Solenoid Valve Duty Percent
c. Item 33: Second Solenoid Valve Duty Percent
d. Item 34: Overdrive Solenoid Valve Duty Percent
• Check that the values shown below are displayed
when each data list item is entered.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
DRIVING CONDITION
DATA LIST ITEM
31
32
33
34
Driving at constant speed of 10 km/h (6.2 mph) in 1st gear 0%
0%
100%
100%
Driving at constant speed of 30 km/h (19 mph) in 2nd gear 100%
0%
0%
100%
Driving at constant speed of 50 km/h (31 mph) in 3rd gear 100%
0%
100%
0%
Driving at constant speed of 50 km/h (31 mph) in 4th gear 100%
100%
0%
0%
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-305
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the solenoid valves operating properly?
YES : Go to Step 4.
NO : Go to Step 6.
STEP 4. 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 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. Replace each solenoid valve.
Replace the faulty solenoid valve with a new one.
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 11: Early or Late Shifting in Some Gears
.
COMMENT
If some of the shift points are early or late when driv-
ing, the cause is probably a malfunction of the valve
body, or it is due to the characteristics of the
INVECS-II system but is not an abnormality.
.
TROUBLESHOOTING HINTS (The most
likely causes for this condition:)
• Malfunction of the valve body
• Malfunction of the PCM
AC001860 AB
VALVE
BODY
ASSEMBLY
AC001869 AB
OVERDRIVE
SOLENOID
VALVE
LOW-
REVERSE
SOLENOID
VALVE
VALVE
BODY
ASSEMBLY
UNDERDRIVE
SOLENOID
VALVE
SECOND
SOLENOID
VALVE
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