Mitsubishi Evolution X. Manual - part 406

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-81

PROBABLE CAUSES

• Malfunction of the shift lever-ECU

• Malfunction of the LIN bus

• 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.

STEP 3. Inspection of the TC-SST-ECU connector, 
intermediate connector, and shift lever-ECU connector: 
B-107, A-13, C-27
Check for the contact with terminals.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the defective connector.

STEP 4. Check the wiring harness between B-107 
TC-SST-ECU connector terminal No. 17 and C-27 shift 
lever-ECU connector terminal No. 16.
Check the communication line for open or short circuit.
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the wiring harness.

STEP 5. 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. P1802 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

.)

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-82

DTC P1803: Shift Lever System (CAN, LIN Time-out Error)

.

SHIFT LEVER SYSTEM CIRCUIT

Refer to 

P.22C-80

.

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 communication with 
the shift lever-ECU (CAN and LIN) is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The CAN and LIN communication with 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

• P1870: Engine torque signal abnormality

• P1871: APS system (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-83

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

• LIN communication with shift lever-ECU: Fail, 

and CAN communication with shift lever-ECU: 
Fail (Immediately).

.

OBD-II DRIVE CYCLE PATTERN

Receives LIN and CAN signal from shift lever-ECU.

.

PROBABLE CAUSES

• Malfunction of the shift lever-ECU

• Malfunction of the LIN bus

• The CAN bus line is defective.

• 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.

AC710733

START

No

Good

Malfunction

END

Yes

Yes

No

Monitoring condition met

Yes

No

CAN communication
with gear shift module
= failed

LIN communication
with gear shift module
= failed

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-84

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.

STEP 3. Inspection of the TC-SST-ECU connector, 
intermediate connector, and shift lever-ECU connector: 
B-107, A-13, C-27
Check for the contact with terminals.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the defective connector.

STEP 4. Check the wiring harness between B-107 
TC-SST-ECU connector terminal No. 17 and C-27 shift 
lever-ECU connector terminal No. 16.
Check the communication line for open or short circuit.
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the wiring harness.

STEP 5. 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. P1803 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 P1804: Shift Fork Position Sensor 1 and 2 System (Power supply voltage low range out)

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 supply voltage to the 
shift fork position sensor 1 and 2 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The supply voltage to the shift fork position sensor 1 
and 2 is too low.

.

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)

• P1820: Shift fork position sensor 1 system (Volt-

age low range out)

• P1821: Shift fork position sensor 1 system (Volt-

age high range out)

• P1822: Shift fork position sensor 1 system (Out-

put range out)