Mitsubishi Montero Sport (2004+). Manual — part 686
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 4. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and 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 repair possible and the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 6.
STEP 5. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Were any A/T DTCs set?
YES : Go to Step 6.
NO : The procedure is complete.
STEP 6. Overhaul the A/T.
(1) Replace the following parts.
• If DTC 41, 42, or 43 are set individually or in a group,
replace the underdrive clutch. Refer to GROUP 23B,
Underdrive Clutch
.
• If DTC 43 or 44 are set individually or in a group, replace
the overdrive clutch. Refer to GROUP 23B, Reverse
and Overdrive Clutch
• If DTC 46 is set individually or in a group, replace the
reverse clutch. Refer to GROUP 23B, Reverse and
Overdrive Clutch
.
• If DTC 41 or 46 are set individually or in a group, replace
the low-reverse brake. Refer to GROUP 23B, Transmis-
sion
• If DTC 42 or 44 are set individually or in a group, replace
the second brake. Refer to GROUP 23B, Transmission
.
• If DTC 41 is set individually or in a group, replace the
one-way clutch. Refer to GROUP 23B, Low Reverse
Annulus Gear
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Are any A/T DTCs set again?
YES : An A/T DTC may have set due to external radio
frequency interference (RFI) possibly caused by
cellular phone activity, or aftermarket components
installed on the vehicle.
NO : The procedure is complete.
AC004272
VALVE BODY ASSEMBLY
AB
AC103774
REVERSE
CLUTCH
SECOND BRAKE
LOW-REVERSE
BRAKE
UNDERDRIVE
CLUTCH
AD
ONE-WAY CLUTCH
OVERDRIVE CLUTCH
AUTOMATIC TRANSMISSION DIAGNOSIS
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DTC 52 (P0741): Torque Converter Clutch System
.
DESCRIPTIONS OF MONITOR METHODS
At start of lock-up operation, if lock-up clutch cannot
be engaged even when duty ratio of torque converter
clutch solenoid remains 100% for more than speci-
fied time, PCM judges that torque converter clutch is
stuck OFF.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• DTC 21 (P0335): Crankshaft position sensor mal-
function
• DTC 22 (P0715): Input shaft speed sensor mal-
function
• DTC 23 (P0720): Output shaft speed sensor mal-
function
• DTC 53 (P0742): Torque converter clutch system
malfunction (Stuck ON)
• DTC 36 (P0743): Torque converter clutch sole-
noid malfunction
• DTC 31 (P0753): Low-reverse solenoid malfunc-
tion
• DTC 32 (P0758): Underdrive solenoid malfunc-
tion
• DTC 33 (P0763): Second solenoid malfunction
• DTC 34 (P0768): Overdrive solenoid malfunction
• DTC 54 (P1751): A/T control relay malfunction
Sensor (The sensor below is determined to be
normal)
• Input shaft speed sensor
• Output shaft speed sensor
• Crankshaft position sensor
• Torque converter clutch solenoid
• Low-reverse solenoid
• Underdrive solenoid
• Second solenoid
• Overdrive solenoid
• A/T control relay
.
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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LOGIC FLOW CHARTS (Monitor Sequence)
.
AC205238
START
END
Transmission range
switch position is in
D, 3 or 2 range
TCC is plunging
into connecting
condition?
TCC solenoid duty
ratio is 100%
Continuous failure for 4 secs.
Good
Malfunction
No
Yes
No
Yes
No
Yes
No
Yes
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DTC SET CONDITIONS
Check Conditions
• Solenoid status: plunging into connecting condi-
tion.
• Transmission range switch position: D, 3 or 2.
Judgement Criteria
• Time during 100% duty: 4 seconds or more.
.
OBD-II DRIVE CYCLE PATTERN
Start the engine, and drive at 100 km/h (62 mph) for
10 seconds. Then stop the vehicle, and turn OFF the
ignition switch. After that, restart the engine, and
drive again at 100 km/h (62 mph) for 10 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the torque converter clutch sole-
noid valve
• Malfunction of the input shaft speed sensor
• Malfunction of the reverse clutch retainer
• Malfunction of the valve body
• Damaged harness or connector
• Malfunction of the PCM
• Malfunction of the torque converter
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, read the A/T
diagnostic trouble code.
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) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 22 or 36 set?
YES <DTC 22 set> : Refer to
, DTC 22: Input
Shaft Speed Sensor System.
YES <DTC 36 set> : Refer to
, DTC 36: Torque
Converter Clutch Solenoid Valve System.
NO : Go to Step 2.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
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