Mitsubishi Lancer Evolution X. Manual — part 580

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-277

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 6th gear.
(3) Check that the DTC is reset.
Q: Is DTC No.P187B 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 6th gear.
(3) Check the DTC.
Q: Is DTC No.P187B set?

YES : Replace the transaxle assembly. (Refer to

P.22C-412

.)

NO : This diagnosis is complete.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-278

DTC P187C: Gear Block Reverse

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 reverse gear is determined
to be impossible.

.

PROBABLE CAUSES

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

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) With the engine idle status, operate the shift lever in the

following sequence: P → R → D → R → P. (Hold each range

for 5 seconds or more.)

(3) Check that the DTC is reset.
Q: Is DTC No.P187C 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

.)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-279

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) With the engine idle status, operate the shift lever in the

following sequence: P → R → D → R → P. (Hold each range

for 5 seconds or more.)

(3) Check the DTC.
Q: Is DTC No.P187C set?

YES : Replace the transaxle assembly. (Refer to

P.22C-412

.)

NO : This diagnosis is complete.

DTC P1880: EOL Mode Active

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 TC-SST setting mode
is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The TC-SST setting mode is determined to be EOL
(end of line) mode.

.

PROBABLE CAUSES

• The setting mode changeover mistake when

TC-SST is shipped.

• Malfunction of TC-SST-ECU

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.
Q: Is DTC No. P1880 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

.)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-280

DTC P1881: Twin clutch SST control mode switch system (Malfunction)

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 twin clutch SST control
mode switch is normal.

.

DESCRIPTIONS OF MONITOR METHODS

"+" and "−" signals of the twin clutch SST control

mode switch is determined to be stuck on.

.

PROBABLE CAUSES

• Twin clutch SST control mode switch malfunction
• Malfunction of TC-SST-ECU

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.
After 5 or more seconds have passed with the engine idle sta-
tus, check that the DTC is reset.
Q: Is DTC No. P1881 set?

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

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 3. Twin clutch SST control mode switch check
Refer to

P.22C-434

.

Q: Is the check result normal?

YES : Go to Step 4.
NO : Replace the twin clutch SST control mode

switch.(Refer to

P.22C-434

.)