Mitsubishi Evolution X. Manual - part 441

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-221

STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to GROUP 
13A 

− Troubleshooting 

P.13A-44

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. P1870 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 P1871: APS system (Signal 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 receives the periodic communication 
data from the engine control module via the CAN bus 
lines, and checks the data for abnormality.

.

DESCRIPTIONS OF MONITOR METHODS

The APS signal from the engine control module 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)

• P0841: Clutch 1 pressure sensor system (Poor 

performance)

• P0842: Clutch 1 pressure sensor system (Output 

low range out)

• P0843: Clutch 1 pressure sensor system (Output 

high range out)

• P0846: Clutch 2 pressure sensor system (Poor 

performance)

• P0847: Clutch 2 pressure sensor system (Output 

low range out)

• P0848: Clutch 2 pressure sensor system (Output 

high range out)

• P185D: Clutch open not possible

• U0001: Bus off

• U0100: Engine time-out error

• P1803: Shift lever system (CAN or LIN time-out 

error)

• P1870: Engine torque signal abnormality

• P1872: Between shift lever and TC-SST system 

(Q-A function abnormality)

Sensor (The sensor below is determined to be 

normal)

• Clutch 1 pressure sensor

• Clutch 2 pressure sensor

• APS

• Shift lever-ECU

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-222

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.

• Time after TC-SST-ECU start: 5 seconds or 

more.

JUDGMENT CRITERIA

• APS signal: Parity or toggle error

.

OBD-II DRIVE CYCLE PATTERN

Receives the normal value of the APS signal, or the 
parity, toggle are normal.

.

PROBABLE CAUSES

• The CAN bus line is defective.

• APS malfunction

• Malfunction of engine control module

• Malfunction of TC-SST-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using the scan tool, 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.

APS signal 
toggle bit = error

AC710735

START

No

Yes

Yes

No

Good

Malfunction

END

Monitoring condition met

No

Yes

APS signal
parity bit = error

Continuous failure
for 200 msec

No

Yes

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-223

STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to GROUP 
13A 

− Troubleshooting 

P.13A-44

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. P1871 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 P1872: Between shift lever and TC-SST system (Q-A function 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 shift lever-ECU is nor-
mal.

.

DESCRIPTIONS OF MONITOR METHODS

The shift lever-ECU 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)

• P0841: Clutch 1 pressure sensor system (Poor 

performance)

• P0842: Clutch 1 pressure sensor system (Output 

low range out)

• P0843: Clutch 1 pressure sensor system (Output 

high range out)

• P0846: Clutch 2 pressure sensor system (Poor 

performance)

• P0847: Clutch 2 pressure sensor system (Output 

low range out)

• P0848: Clutch 2 pressure sensor system (Output 

high range out)

• P185D: Clutch open not possible

• U0001: Bus off

• U0100: Engine time-out error

• P1803: Shift lever system (CAN or LIN time-out 

error)

• P1870: Engine torque signal abnormality

• P1871: APS system (Signal abnormality)

Sensor (The sensor below is determined to be 

normal)

• Clutch 1 pressure sensor

• Clutch 2 pressure sensor

• APS

• Shift lever-ECU

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-224

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.

• Time after TC-SST-ECU start: 5 seconds or 

more.

JUDGMENT CRITERIA

• Communication algorithm: Undesigned signal.

.

OBD-II DRIVE CYCLE PATTERN

The communication algorithm is normal.

.

PROBABLE CAUSES

• Malfunction of the shift lever-ECU

• 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.

STEP 2. Scan tool diagnostic trouble code
Check the shift lever diagnostic trouble code. (Refer to 

P.22C-302

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

Question - Answer
algorithm = failed

AC710736

START

No

Yes

Yes

Good

Malfunction

END

Monitoring condition met

No