Mitsubishi Evolution X. Manual - part 426

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-161

LOGIC FLOW CHARTS (Monitor Sequence) 

 

<Functional check - Shift fork 2 requested but shift fork 4 movement>

.

AC710709

START

No

Good

Malfunction

END

No

Yes

Yes

Yes

No

Yes

Yes

No

Yes

No

Yes

No

Continuous failure
for 200 msec

Yes

Yes

No

No

Monitoring condition met

|Initialized fork position -
shift fork 2 position| < 2.5 mm
(0.098 inch)

Shift fork 4 position
4th gear side

Shift fork 4 position
 < 6 mm (0.24 inch)

Shift fork 4 position
2nd gear side

Shift fork 4 position
> -6 mm (-0.24 inch)

No

Shift fork 4 position
neutral position

|Shift fork 4 position|
> 1.8 mm (0.071 inch)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-162

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - SHIFT FORK 2 REQUESTED 
BUT SHIFT FORK 4 MOVEMENT>

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.

• Requested shift fork: Shift fork 2.

Judgement Criteria

• Shift fork position: 6 mm (0.24 inch) [4th gear 

side] or less, or 

−6 mm (−0.24 inch) [2nd gear side] 

or more, or 1.8 mm (0.071 inch) [neutral position] 
or more, and Initialized fork position 

− shift fork 2 

position: 2.5 mm (0.098 inch) or less. (200 milli-
second)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - SHIFT FORK 2 
REQUESTED BUT SHIFT FORK 4 
MOVEMENT>

The status with the shift fork position 6 mm (0.24 
inch) or more, or with 

−6 mm (−0.24 inch) or less, or 

with 1.8 mm (0.071 inch) or less and with the initial-
ized fork position 

− shift fork 1 position 2.5 mm (0.098 

inch) or more continues for 200 milliseconds.

.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-163

LOGIC FLOW CHARTS (Monitor Sequence) 

 

<Functional check - Shift fork 2 requested but shift fork 1 movement>

.

AC710710

START

No

Good

Malfunction

END

No

Yes

Yes

Yes

No

Yes

Yes

No

Yes

No

Yes

No

Continuous failure
for 200 msec

Yes

Yes

No

No

Monitoring condition met

|Initialized fork position -
shift fork 2 position| < 2.5 mm
(0.098 inch)

Shift fork 1 position
1st gear side

Shift fork 1 position
 < 6 mm (0.24 inch)

Shift fork 1 position
R gear side

Shift fork 1 position
> -6 mm (-0.24 inch)

No

Shift fork 1 position
neutral position

|Shift fork 1 position|
> 1.8 mm (0.071 inch)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-164

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - SHIFT FORK 2 REQUESTED 
BUT SHIFT FORK 1 MOVEMENT>

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.

• Requested shift fork: Shift fork 2.

Judgement Criteria

• Shift fork position: 6 mm (0.24 inch) [1st gear 

side] or less, or 

−6 mm (−0.24 inch) [reverse gear 

side] or more, or 1.8 mm (0.071 inch) [neutral 
position] or more, and initialized fork position 

− 

shift fork 2 position: 2.5 mm (0.098 inch) or less. 
(200 millisecond)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - SHIFT FORK 2 
REQUESTED BUT SHIFT FORK 1 
MOVEMENT>

The status with the shift fork position 6 mm (0.24 
inch) [1st gear side] or more, or with 

−6 mm (−0.24 

inch) [reverse gear side] or less, or with 1.8 mm 
(0.071 inch) [neutral position] or less and with the ini-
tialized fork position 

− shift fork 2 position 2.5 mm 

(0.098 inch) or more continues for 200 milliseconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

• Malfunction of TC-SST shift fork

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. P183D 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 P1844: Shift Fork 3 Malfunction

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 3 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The movement of the shift fork 3 is determined to be 
abnormal.

.

MONITOR EXECUTION

• Continuous

.