Mitsubishi Lancer Evolution X. Manual - part 520

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-37

STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to GROUP 
13A − Troubleshooting 

P.13A-48

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. Check whether the DTC is reset.
After 10 or more seconds have passed with the engine idle sta-
tus, check that the DTC is reset.
Q: Is DTC No. P0725 set?

YES : Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P0746: Line Pressure Solenoid System (Drive current range out)

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnostic trouble code may be 
set. Prior to this diagnosis, diagnose the CAN 
bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

.

DIAGNOSTIC FUNCTION

TC-SST-ECU checks that the line pressure solenoid 
is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The difference between the actual current of the line 
pressure solenoid and target current is large.

.

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)

• P0960: Line pressure solenoid system (Open cir-

cuit)

• P0961: Line pressure solenoid system (Overvolt-

age)

• P0962: Line pressure solenoid system (Short to 

ground)

• P0963: Line pressure solenoid system (Short to 

power supply)

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-38

LOGIC FLOW CHARTS (Monitor Sequence) <Rationality - high>

.

DTC SET CONDITIONS

Check Conditions <Rationality-high>

• Voltage of battery: 8 V or more.
• Voltage of battery: 16.5 V or less.

JUDGMENT CRITERIA <Rationality-high>

• Calculated current (actual current − target cur-

rent): 500 mA or more. (1 second)

.

OBD-II DRIVE CYCLE PATTERN 
<RATIONALITY-HIGH>

The value of the calculated current (actual current − 

target current) remains 500 mA or less for 1 second.

.

AC710625

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 1 sec

No

Yes

Calculated current > 500 mA

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-39

LOGIC FLOW CHARTS (Monitor Sequence) <Rationality - low>

.

DTC SET CONDITIONS

Check Conditions <Rationality-low>

• Voltage of battery: 8 V or more.
• Voltage of battery: 16.5 V or less.

JUDGMENT CRITERIA <Rationality-low>

• Calculated current (target current − actual cur-

rent): 500 mA or more. (12 seconds)

.

OBD-II DRIVE CYCLE PATTERN 
<RATIONALITY-LOW>

The value of the calculated current (target current − 

actual current) remains 500 mA or less for 12 sec-
onds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of line pressure solenoid

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.) After repairing the CAN 

bus line, go to Step 2.

AC710626

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 12 sec

No

Yes

Calculated current > 500 mA

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-40

STEP 2. Check whether the DTC is reset.
Leave the engine idle for 15 seconds, and perform a test run of 
the vehicle. Then check that the DTC is reset.
Q: Is DTC No. P0746 set?

YES : Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P0753: Shift Select Solenoid 1 System (Open circuit)

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnostic trouble code may be 
set. Prior to this diagnosis, diagnose the CAN 
bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

.

DIAGNOSTIC FUNCTION

TC-SST-ECU checks that the shift select solenoid 1 
circuit is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The shift select solenoid 1 circuit is determined to be 
open.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.