Mitsubishi Lancer Evolution X. Manual - part 577

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-265

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.

JUDGMENT CRITERIA

• Sensor output speed: 16,000 r/min or more. (400 

millisecond)

• The absolute value of the "Engine speed via 

CAN" − "Sensor output speed" remains 500 r/min 

or more. (500 millisecond)

.

OBD-II DRIVE CYCLE PATTERN

• The output of the sensor remains 16,000 r/min or 

less for 400 millisecond.

• The absolute value of the "Engine speed via 

CAN" − "Sensor output speed" remains 500 r/min 

or less for 500 millisecond.

.

PROBABLE CAUSES

• Malfunction of damper speed sensor
• 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

AC710618

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 500 msec

No

Yes

|Engine speed (CAN)-
sensor output speed|
> 500 r/min

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-266

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.
With the vehicle stopped, hold a specific accelerator pedal 
angle for 20 seconds, and check that the DTC is reset.
Q: Is DTC No.P1875 set?

YES : Replace the transaxle assembly. (Refer to 

P.22C-412

.)

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

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P1876: Gear Block 1st

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 1st 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.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-267

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.P1876 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) 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.P1876 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-268

DTC P1877: Gear Block 2nd

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 2nd 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: 2nd gear.

JUDGMENT CRITERIA

• Gear (synchro) engagement: 3 times blocked. 

(immediately)

.

OBD-II DRIVE CYCLE PATTERN

The 2nd 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