Mitsubishi Montero Sport (2004+). Manual - part 687

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-313

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 

P.23A-26

, 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 

P.23A-39

, 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

TSB Revision

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 

P.23B-19

.

(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 

P.23A-453

, 

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