Mitsubishi Montero Sport (2004+). Manual — part 687
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 2. Using scan tool MB991958, check data list item 36:
Torque Converter Clutch Solenoid Valve Duty %.
(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 data reading mode.
• Item 36: Torque Converter Clutch Solenoid Valve Duty
%.
• When driving at constant speed of 60 km/h (37
mph), the display should be "70
− 99.6%" (Gear
range: 3rd gear).
• When the accelerator pedal is released [at less than
50 km/h (31 mph)], the display should be "70
−
99.6%
→ 0%" (decreases gradually as the vehicle
speed decreases) (Gear range: 3rd gear).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
YES : Go to Step 3.
NO : Go to Step 5.
STEP 3. Using scan tool MB991958, check data list item 52:
Torque Converter Clutch Amount of Slippage.
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. (Warming up engine)
(3) Set scan tool MB991958 to the data reading mode.
• Item 52: Torque Converter Clutch Amount of Slippage.
• Driving at a constant speed of 60 km/h (37 mph), the
display should be "
−10 to 10 r/min."
• If the accelerator pedal is released, the display on
the scan tool changes (50 km/h (31 mph) and less).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the clutch operating properly?
YES : Go to Step 4.
NO : Go to Step 5.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 4. 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 52 set?
YES : Replace the PCM.
NO : The procedure is complete.
STEP 5. Check the hydraulic pressure (for torque
converter).
Measure the hydraulic pressure for torque converter. Check if
the hydraulic pressure is within the standard value. Refer to
, Hydraulic Pressure Test.
Q: Is the hydraulic pressure within the standard value?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Adjust line pressure.
Adjust line pressure. Refer to
, Line Pressure Adjust-
ment. Then check the symptom.
Q: Is the symptom eliminated?
YES : The procedure is complete.
NO : Go to Step 8.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
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STEP 7. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 52 set?
YES : Go to Step 8.
NO : The procedure is complete.
STEP 8. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B,
Transmission
.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 52 set?
YES : Replace the torque converter. Refer to
Transmission and Transfer Assembly.
NO : The procedure is complete.
DTC 53 (P0742): Torque Converter Clutch is Stuck On
.
DESCRIPTIONS OF MONITOR METHODS
With PCM signal for no lock-up engagement, if vehi-
cle speed equals or exceeds specified value, accel-
erator is ON, and torque converter slip amount is
below specified value, PCM judges that torque con-
verter clutch is stuck ON.
.
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 52 (P0741): Torque converter clutch system
malfunction (Stuck OFF)
• DTC 36 (P0743): Torque converter clutch sole-
noid 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
.
AC004272
VALVE BODY ASSEMBLY
AB
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LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Throttle position sensor voltage: 1.5 volts or
more.
• Output speed: 1,000 r/min or more.
• Solenoid status: OFF.
• Transmission range switch position: D, 3, 2 or L.
• Time after lock up clutch release: 5 seconds or
more.
AC205239
START
END
Transmission range
switch position is in
D, 3, 2 or L range
TCC solenoid is in
OFF steady state
TCC in disengagement area
Timer start
TCC in disengagement area
Timer > 5 secs.
V
THROTTLE
> 1.5 V
N
OPG-B
> 1,000 r/min
N
E
- 5 < N
IPG-A
< N
E
+ 5
Continuous failure
for 10 secs.
Good
Malfunction
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
N
E
:
Engine speed
N
OPG-B
: Output speed
(output shaft speed sensor)
N
IPG-A
: Input speed
(input shaft speed sensor)
V
THROTTLE
: Throttle position sensor
output voltage
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