Mitsubishi Lancer Evolution X. Manual — part 579

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-273

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.

STEP 2. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive with shifted in the 4th gear.
(3) Check that the DTC is reset.
Q: Is DTC No.P1879 set?

YES : Go to Step 3.
NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 3. Scan tool Teach-In
(1) Carry out the Item No.3: Line pressure Test. (Refer to

Special Function (Teach-In Reference Table

P.22C-365

).)

(2) After Teach-In, check which result ("Yes" or "No") is

displayed in the Data list No. 101: Normal End. (Refer to
Special Function (Teach-In Reference Table

P.22C-365

).)

Q: Which is displayed, "Yes" or "No"?

"Yes" : Go to Step 4
"No" : DTC No. P181B: Carry out the troubleshooting for

the DTC No. P181B: Clutch 1 (Pressure low range
out). (Refer to

P.22C-109

.)

STEP 4. Replace the clutch assembly, and check if the DTC
is reset.
(1) Replace the clutch assembly. (Refer to GROUP 22D

−Transaxle

P.22D-6

.)

(2) Drive with shifted in the 4th gear.
(3) Check the DTC.
Q: Is DTC No.P1879 set?

YES : Replace the transaxle assembly. (Refer to

P.22C-412

.)

NO : This diagnosis is complete.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-274

DTC P187A: Gear Block 5th

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 gear engagement is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The engagement of the 5th gear is determined to be
impossible.

.

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

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Engine speed: 650 r/min or more.
• Time since above engine condition: 1.5 seconds

or more.

• Target gear: 5th gear.

JUDGMENT CRITERIA

• Gear (synchro) engagement: 3 times blocked.

(immediately)

.

OBD-II DRIVE CYCLE PATTERN

The 5th gear is engaged.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of TC-SST gear
• Malfunction of clutch assembly

AC710729

START

No

Good

Malfunction

END

Yes

Yes

Monitoring condition met

No

Gear (synchro) engagement
is 3 times blocked

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-275

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.

STEP 2. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive with shifted in the 5th gear.
(3) Check that the DTC is reset.
Q: Is DTC No.P187A set?

YES : Go to Step 3.
NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 3. Scan tool Teach-In
(1) Carry out the Item No.3: Line pressure Test. (Refer to

Special Function (Teach-In Reference Table

P.22C-365

).)

(2) After Teach-In, check which result ("Yes" or "No") is

displayed in the Data list No. 101: Normal End. (Refer to
Special Function (Teach-In Reference Table

P.22C-365

).)

Q: Which is displayed, "Yes" or "No"?

"Yes" : Go to Step 4
"No" : DTC No. P181B: Carry out the troubleshooting for

the DTC No. P181B: Clutch 1 (Pressure low range
out). (Refer to

P.22C-109

.)

STEP 4. Replace the clutch assembly, and check if the DTC
is reset.
(1) Replace the clutch assembly. (Refer to GROUP 22D

−Transaxle

P.22D-6

.)

(2) Drive with shifted in the 5th gear.
(3) Check the DTC.
Q: Is DTC No.P187A set?

YES : Replace the transaxle assembly. (Refer to

P.22C-412

.)

NO : This diagnosis is complete.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-276

DTC P187B: Gear Block 6th

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 gear engagement is
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The engagement of the 6th gear is determined to be
impossible.

.

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

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

Check Conditions

• Engine speed: 650 r/min or more.
• Time since above engine condition: 1.5 seconds

or more.

• Target gear: 6th gear.

JUDGMENT CRITERIA

• Gear (synchro) engagement: 3 times blocked.

(immediately)

.

OBD-II DRIVE CYCLE PATTERN

The 6th gear is engaged.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of TC-SST gear
• Malfunction of clutch assembly

AC710729

START

No

Good

Malfunction

END

Yes

Yes

Monitoring condition met

No

Gear (synchro) engagement
is 3 times blocked