Mitsubishi Evolution X. Manual - part 431

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-181

LOGIC FLOW CHARTS (Monitor Sequence) 

 

<Functional check - move opposite direction left side>

.

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - MOVE OPPOSITE DIRECTION 
LEFT SIDE>

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.

• Shift fork 1 and 2 current gear: Neutral.

• Shift fork 1 and 2 target direction: 0 mm (0 inch) 

or more.

JUDGMENT CRITERIA

• Shift fork 1 and 2 position: −1.8 mm (−0.071 inch) 

or less. (250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - MOVE 
OPPOSITE DIRECTION LEFT SIDE>

The shift fork 1 and 2 positions remain 

−1.8 mm 

(

−0.071 inch) or more for 250 milliseconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST shift fork

AC710721

START

No

Good

Malfunction

END

Continuous failure
for 250 msec

No

Yes

Yes

Monitoring condition met

Yes

No

Shift fork position
< -1.8 mm (-0.071 inch)

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-182

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 the DTC No. P1852 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 P1855: Shift Fork 3 or 4 opposite direction movement

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 movement of the shift 
fork is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The movements of the shift fork 3 and 4 are deter-
mined 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)

• P1836: Shift fork 1 malfunction

• P183D: Shift fork 2 malfunction

• P1844: Shift fork 3 malfunction

• P184B: Shift fork 4 malfunction

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-183

LOGIC FLOW CHARTS (Monitor Sequence) 

 

<Functional check - move opposite direction right side>

.

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - MOVE OPPOSITE DIRECTION 
RIGHT SIDE>

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.

• Shift fork 3 and 4 current gear: Neutral.

• Shift fork 3 and 4 target direction: 0 mm (0 inch) 

or less.

JUDGMENT CRITERIA

• Shift fork 3 and 4 position: 1.8 mm (0.071 inch) or 

more. (250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - MOVE 
OPPOSITE DIRECTION RIGHT SIDE>

The shift fork 3 and 4 positions remain 1.8 mm 
(0.071 inch) or less for 250 milliseconds.

.

AC710720

START

No

Good

Malfunction

END

Continuous failure
for 250 msec

No

Yes

Yes

Monitoring condition met

Yes

No

Shift fork position
> 1.8 mm (0.071 inch)

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-184

LOGIC FLOW CHARTS (Monitor Sequence) 

 

<Functional check - move opposite direction left side>

.

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - MOVE OPPOSITE DIRECTION 
LEFT SIDE>

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.

• Shift fork 3 and 4 current gear: Neutral.

• Shift fork 3 and 4 target direction: 0 mm (0 inch) 

or more.

JUDGMENT CRITERIA

• Shift fork 3 and 4 position: −1.8 mm (−0.071 inch) 

or less. (250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - MOVE 
OPPOSITE DIRECTION LEFT SIDE>

The shift fork 3 and 4 positions remain 

−1.8 mm 

(

−0.071 inch) or more for 250 milliseconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST shift fork

AC710721

START

No

Good

Malfunction

END

Continuous failure
for 250 msec

No

Yes

Yes

Monitoring condition met

Yes

No

Shift fork position
< -1.8 mm (-0.071 inch)