Mitsubishi Evolution X. Manual - part 442

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-225

STEP 3. Replace the shift lever assembly, and check if the 
diagnostic trouble code is reset.
(1) Replace the shift lever assembly. (Refer to 

P.22C-334

.)

(2) Check the DTC.
Q: Is DTC No. P1872 set?

YES : Replace the TC-SST assembly. (Refer to 

P.22C-341

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P1873: Clutch 1 System (Pressure abnormality)

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 1 pressure is 
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The clutch 1 pressure is determined to be abnormal.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST clutch

DIAGNOSTIC PROCEDURE

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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1873 set?

YES : Replace the TC-SST assembly. (Refer to 

P.22C-341

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P1874: Clutch 2 System (Pressure abnormality)

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 2 pressure is 
normal.

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-226

DESCRIPTIONS OF MONITOR METHODS

The clutch 2 pressure is determined to be abnormal.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST clutch

DIAGNOSTIC PROCEDURE

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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1874 set?

YES : Replace the TC-SST assembly. (Refer to 

P.22C-341

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P1875: Damper Speed Sensor System (Poor performance)

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 damper (closer to the 
engine than input shaft) is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The damper speed sensor is determined to be 
abnormal.

.

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)

• P0715: Input shaft 1 (odd number gear axle) 

speed sensor system (Output high range out)

• P0716: Input shaft 1 (odd number gear axle) 

speed sensor system (Poor performance)

• P0717: Input shaft 1 (odd number gear axle) 

speed sensor system (Output low range out)

• P2766: Input shaft 2 (even number gear axle) 

speed sensor system (Poor performance)

Sensor (The sensor below is determined to be 

normal)

• Input shaft 1 (odd number gear axle) speed sen-

sor

• Input shaft 2 (even number gear axle) speed sen-

sor

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-227

LOGIC FLOW CHARTS (Monitor Sequence)

.

AC710617

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No

Continuous failure
for 400 msec

No

Yes

Sensor output speed
> 16,000 r/min

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-228

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: 500 r/min or more.

• Time since above engine condition: 400 millisec-

ond.

JUDGMENT CRITERIA

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

millisecond)

• |"Engine speed via CAN" − "Sensor output 

speed"|: 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 milliseconds.

• The value of the |"Engine speed via CAN" − "Sen-

sor output speed"| remains 500 r/min or less for 
500 milliseconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

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-14

.) After repairing the CAN 

bus line, go to Step 2.

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