Mitsubishi Galant. Manual — part 442
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-235
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set:)
•
Malfunction of the output shaft speed sensor
•
Malfunction of the throttle position sensor
•
Malfunction of each solenoid valve
•
Abnormal line pressure
•
Malfunction of the valve body
•
Malfunction of the PCM
DIAGNOSIS
REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 23:
Output Shaft Speed Sensor.
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) Start the engine.
(3) Set scan tool MB991502 to data reading mode for item 23:
Output Shaft Speed Sensor.
•
When driving at constant speed of 50km/h (31mph), the
display should be 1,600
−
1,900 r/min <2.4L Engine>,
1,300
−
1,600 r/min <3.0L Engine>. (Gear range: 3rd
gear)
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 2.
NO : Refer to
, code number 23: Output shaft
speed sensor system.
STEP 2. Using scan tool MB991502, check data list item 11:
Throttle position sensor.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to data reading mode for item 11:
Throttle Position Sensor.
•
With the throttle valve in idle position, voltage should be
between 535 and 735 mV.
•
With the throttle valve in full-open position, voltage
should be between 4,500 and 5,500 mV.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 3.
NO : Check the throttle position sensor. Refer to
, code number 11, 12, 14: Throttle
Position Sensor System. Then check the malfunction.
AC003081AC
MB991502
DATA LINK
CONNECTOR
AC003081AC
MB991502
DATA LINK
CONNECTOR
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-236
STEP 3. Using scan tool MB991502, check data list.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991502 to 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.
(4) Turn the ignition switch to "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 : Diagnosis 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
.
Q: Is the repair possible and the symptom eliminated?
YES : Diagnosis is complete.
NO : Replace the valve body assembly. Then check the
symptom. Go to Step 7.
AC003081AC
MB991502
DATA LINK
CONNECTOR
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%
AC001860 AB
VALVE
BODY
ASSEMBLY
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-237
STEP 6. Replace each solenoid valve.
Replace the faulty solenoid valve with a new one.
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.
INSPECTION PROCEDURE 11: Some Points (Early or Late Shift Points)
COMMENT
If some of the shift points are early or late when
driving, 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 case:)
•
Malfunction of the valve body
•
Malfunction of the PCM
DIAGNOSIS
REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check actuator test
item 14: INVECS-II Cancel Command.
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) Start the engine.
(3) Set scan tool MB991502 to actuator test mode for item14:
INVECS-II Cancel Command.
•
The gear shifting correspond to the standard shift line of
the shift pattern diagram. Refer to
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Does the gear shifting correspond to the standard shift
line of the shift pattern diagram?
YES : The symptom is due to characteristics of the INVECS-
II system, but is not abnormal.
NO : Go to Step 2.
AC001869 AB
OVERDRIVE
SOLENOID
VALVE
LOW-
REVERSE
SOLENOID
VALVE
VALVE
BODY
ASSEMBLY
UNDERDRIVE
SOLENOID
VALVE
SECOND
SOLENOID
VALVE
AC003081AC
MB991502
DATA LINK
CONNECTOR
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-238
STEP 2. Check the shift points.
Q: Are the shift points early or late only when A/T fluid is -
29
°°°°
C (84
°°°°
F) or less, or 125
°°°°
C (257
°°°°
F) or more?
YES : The symptom is due to characteristics of the INVECS-
II system, but is not abnormal.
NO : Go to Step 3.
STEP 3. 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
.
Q: Is the repair possible and the symptom eliminated?
YES : Diagnosis is complete.
NO : Replace the valve body assembly. Then check the
symptom. Go to Step 4.
STEP 4. Replace the PCM.
Q: Is the symptom eliminated?
YES : Diagnosis is complete.
NO : Start over at Step 1.
AC001860 AB
VALVE
BODY
ASSEMBLY
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