Mitsubishi Evolution X. Manual - part 433

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-189

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1858 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 P1859: Disengagement too late with clutch 1

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 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The disengagement of the clutch 1 is determined to 
be late.

.

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)

• P1836: Shift fork 1 malfunction

• P183D: Shift fork 2 malfunction

Sensor (The sensor below is determined to be 

normal)

• Clutch 1 pressure sensor

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

AC710675

START

No

Good

Malfunction

END

Yes

Malfunction criteria met

Yes

Monitoring condition met

No

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-190

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 or more.

• Clutch 1 (odd) state: Disengaging.

JUDGMENT CRITERIA

•

• The disengagement time of the clutch (depends 

on the fluid temperature) is outside the threshold 
value.

.

OBD-II DRIVE CYCLE PATTERN

The disengagement time of the clutch (depends on 
the fluid temperature) corresponds with the threshold 
value. 

.

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.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1859 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 P185A: Engagement too late with clutch 1

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 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The engagement of the clutch 1 is determined to be 
late.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

AC710825

Maxim

um allo

w

ed time (sec)

25

20

15

10

5

-30-20-10

0

60

120

Fluid temperature (degC)

AB

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-191

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. P185A 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 P185B: Disengagement too late with clutch 2

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 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The disengagement of the clutch 2 is determined to 
be late.

.

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)

• 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)

• P1844: Shift fork 3 malfunction

• P184B: Shift fork 4 malfunction

Sensor (The sensor below is determined to be 

normal)

• Clutch 2 pressure sensor

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-192

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 or more.

• Clutch 2 (even) state: Disengaging.

JUDGMENT CRITERIA

•

• The disengagement time of the clutch (depends 

on the fluid temperature) is outside the threshold 
value.

.

OBD-II DRIVE CYCLE PATTERN

The disengagement time of the clutch (depends on 
the fluid temperature) corresponds with the threshold 
value. 

.

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.

AC710675

START

No

Good

Malfunction

END

Yes

Malfunction criteria met

Yes

Monitoring condition met

No

AC710825

Maxim

um allo

w

ed time (sec)

25

20

15

10

5

-30-20-10

0

60

120

Fluid temperature (degC)

AB