Mitsubishi Eclipse. Manual — part 827
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-317
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 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
. Then confirm
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.
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-318
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
, Reverse and
Overdrive Clutch
. Then check for the symptom.
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
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-319
INSPECTION PROCEDURE 10: Early or Late Shifting 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 case:)
• 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
• MB991911: MUT-III Main Harness B
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 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 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.
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-320
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 data reading mode for item 11:
TP Sensor.
• With the throttle valve in idle position, voltage should
measure between 535 and 735 mV.
• With the throttle valve in full-open position, voltage
should measure between 4,500 and 5,500 mV.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 535 and 735 mV at
idle, and between 4,500 and 5,500 mV in the full-open
position?
YES : Go to Step 3.
NO : Check the TP sensor. Refer to
, DTCs 11, 12, 14: TP Sensor System. Then
check the malfunction.
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 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.
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
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%
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