Mitsubishi Montero (2004+). Manual — part 940
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-335
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 CASE:)
• 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, 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.
STEP 4. Check each brake system and clutch system.
(1) Remove the valve body cover and valve body. Refer to
GROUP 23B, Transmission
.
(2) Blow 108 kPa (15 psi) compressed air into the each brake
oil orifice and clutch oil orifice of the transmission 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.
ACX02249 AF
OVERDRIVE CLUTCH
OIL ORIFICE
REVERSE
CLUTCH
OIL ORIFICE
SECOND
BRAKE OIL
ORIFICE
LOW-REVERSE
BRAKE OIL ORIFICE
UNDERDRIVE
CLUTCH OIL
ORIFICE
DIRECT
CLUTCH
OIL ORIFICE
REDUCTION
BRAKE OIL
ORIFICE
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 5. Check each brake system and clutch system.
(1) Remove the transmission.
(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, Transmission
, Underdrive Clutch
, Reverse and
Overdrive Clutches
, Direct Clutch
Then check for the symptom.
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.
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 CASE:)
• 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
• MB991911: MUT-III Main Harness B
AC204883 AH
OVERDRIVE
CLUTCH
REDUCTION
BRAKE
REVERSE
CLUTCH
SECOND
BRAKE
LOW-REVERSE
BRAKE
UNDERDRIVE
CLUTCH
DIRECT
CLUTCH
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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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.
STEP 2. Check the vibration.
Q: Does the vibration occur when the transmission fluid
temperature sensor connector has been disconnected?
YES : Check the engine system. Refer to GROUP 13A,
Diagnosis
− Symptom Chart − Driving
. If the
inspection result is not good, diagnose, repair, and/or
replace the engine component(s).
NO : Go to Step 3.
STEP 3. Check the torque converter hydraulic pressure.
Measure the torque converter hydraulic pressure. Then check if
the torque converter hydraulic pressure is within the standard
value. Refer to
, Hydraulic Pressure Test.
Q: Is the torque converter hydraulic pressure within the
standard value?
YES : Go to Step 4.
NO : Go to Step 5.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 4. Replace the torque converter assembly.
(1) Remove the transmission.
(2) Replace the torque converter assembly. Then check the
symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 6.
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 6.
STEP 6. Replace the PCM.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Start over at Step 1.
AC204883 AE
ACX02161AD
VALVE BODY ASSEMBLY
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