Mitsubishi Lancer Evolution X. Manual - part 522

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-45

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Voltage of battery: 8 V or more.
• Voltage of battery: 16.5 V or less.
• Engine speed: 650 r/min or more.
• Time since above engine condition: 1.5 seconds 

or more.

JUDGMENT CRITERIA <Rationality-high>

• Calculated current (actual current − target cur-

rent): 1,000 mA or more. (1 second)

JUDGMENT CRITERIA <Rationality-low>

• Calculated current (target current − actual cur-

rent): 1,000 mA or more. (1 second)

.

OBD-II DRIVE CYCLE PATTERN 
<RATIONALITY-HIGH>

The value of the calculated current (actual current − 

target current) remains 1,000 mA or less for 1 sec-
ond.

.

OBD-II DRIVE CYCLE PATTERN 
<RATIONALITY-LOW>

The value of the calculated current (target current − 

actual current) remains 1,000 mA or less for 1 sec-
ond.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of clutch cooling flow 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

AC710633

START

No

Yes

Good

Malfunction

END

Monitoring condition met

Continuous failure
for 1 sec

No

Yes

Yes

No

Calculated current
> 1,000 mA

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-46

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.

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. P0776 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 P0777: Clutch Cooling Flow Solenoid System (Stuck)

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 clutch cooling flow 
solenoid is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The clutch cooling flow solenoid is determined to be 
seized.

.

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)

• P0776: Clutch cooling flow solenoid system 

(Drive current range out)

• P0964: Clutch cooling flow solenoid system 

(Open circuit)

• P0965: Clutch cooling flow solenoid system 

(Overvoltage)

• P0966: Clutch cooling flow solenoid system 

(Short to ground)

• P0967: Clutch cooling flow solenoid system 

(Short to power supply)

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-47

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Voltage of battery: 8 V or more.
• Voltage of battery: 16.5 V or less.
• Engine speed: 650 r/min or more.
• Time since above engine condition: 1.5 seconds 

or more.

• Clutch 1 target pressure: 380 hPa or more.
• Clutch 2 target pressure: 380 hPa or more.

.

JUDGMENT CRITERIA

• Clutch 1 pressure: 100 hPa or less, and clutch 2 

pressure: 100 hPa or less. (8 seconds)

.

OBD-II DRIVE CYCLE PATTERN

The Clutch 1 pressure and clutch 2 pressure remain 
100 hPa or more for 8 seconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of clutch cooling flow solenoid
• Insufficient fluid level
• Improper installation of mechatronic assembly

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

AC710635

START

No

Yes

Good

Malfunction

END

Monitoring condition met

Continuous failure
for 3 sec

No

Yes

Yes

No

Clutch 2 pressure
< 100 mbar

Clutch 1 pressure
< 100 mbar

Yes

No

AC

8

hPa

hPa

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-48

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.

STEP 2. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Carry out the Item No. 3 (Teach-In) : Line pressure Test. 

(Refer to Special Function (Teach-In Reference Table 

P.22C-365

).) 

(3) With the engine idle status, check that the DTC is reset.
Q: Is the DTC No. P0777 restored? or Is the line pressure 

test of Teach-In not completed normally ("No" is 
displayed in the Data list No.101: Normal End)?
YES : Go to Step 3.
NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 3. Check the fluid.
Q: Is the fluid level proper?

YES : Go to Step 4
NO :  Add the fluid.

STEP 4. Check the installation status of the mechatronic 
assembly.
Q: Is the mechatronic assembly installed correctly?

YES : Go to Step 5
NO :  Install the mechatronic assembly correctly. (Refer to 

P.22C-421

.)

STEP 5. Check whether the DTC is reset.
(1) Erase the DTC.
(2) With the engine idle status, check that the DTC is reset.
Q: Is DTC No.P0777 set?

YES : Replace the mechatronic assembly. (Refer to 

P.22C-421

.) Then, go to Step 6.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 6. Check whether the DTC is reset.
(1) Erase the DTC.
(2) With the engine idle status, check that the DTC is reset.
Q: Is DTC No.P0777 set?

YES : Replace the transaxle assembly. (Refer to 

P.22C-412

.)

NO :  This diagnosis is complete.