Mitsubishi Montero (2004+). Manual — part 938
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-327
STEP 4. 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
e. Item 35: Reduction 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 the "LOCK" (OFF) position.
Q: Are the solenoid valves operating properly?
YES : Go to Step 5.
NO : Go to Step 7.
STEP 5. 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 6.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
DRIVING CONDITION
DATA LIST ITEM
31
32
33
34
35
Driving at constant speed of 10 km/h (6.2 mph) in 1st gear
0%
0%
100%
100%
0%
Driving at constant speed of 30 km/h (19 mph) in 2nd gear
100%
0%
0%
100%
0%
Driving at constant speed of 50 km/h (31 mph) in 3rd gear
100%
0%
100%
0%
0%
Driving at constant speed of 50 km/h (31 mph) in 4th gear
0%
0%
100%
0%
100%
Driving at constant speed of 70 km/h (44 mph) in 5th gear
100%
100%
0%
0%
100%
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-328
STEP 6. 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 8.
STEP 7. 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 8.
STEP 8. 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 CASE:)
• 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
ACX02161AD
VALVE BODY ASSEMBLY
ACX02161AF
LOW-REVERSE
SOLENOID
VALVE
TORQUE CONVERTER
CLUTCH SOLENOID VALVE
OVER DRIVE
SOLENOID VALVE
SECOND
SOLENOID
VALVE
UNDERDRIVE
SOLENOID VALVE
REDUCTION
SOLENOID
VALVE <5A/T>
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-329
STEP 1. Using scan tool MB991958, check actuator test
item 14: INVECS-II Cancel Command.
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 actuator test mode.
• Item14: INVECS-II Cancel Command.
• Drive the vehicle and confirm the gear shifting corre-
spond to the standard shift line of the shift pattern
diagram. Refer to
.
(4) Turn the ignition switch to the "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.
STEP 2. Check the shift points.
Q: Are the shift points early or late only when transmission
fluid is -29
°C (84°F) or less (early), or 125°C (257°F) or
more (late)?
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
.
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 4.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
ACX02161AD
VALVE BODY ASSEMBLY
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-330
STEP 4. Replace the PCM.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Start over at Step 1.
INSPECTION PROCEDURE 12: No Diagnostic Trouble Codes (Does not Shift)
AC205198 AC
Backup Power Supply Circuit
AC204167
CONNECTOR : A-03
AT
A-03 (B)
6
12
5
3 4
2
1
9 10
8
7
11
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