Mitsubishi Evolution X. Manual - part 428

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-169

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - SHIFT FORK 3 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 3.

JUDGMENT 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 3 position: 2.5 mm (0.098 inch) or less. 
(200 millisecond)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - SHIFT FORK 3 
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 3 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-170

LOGIC FLOW CHARTS (Monitor Sequence) 

 

<Functional check - shift fork 3 requested but shift fork 4 movement>

.

AC710713

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 3 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>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-171

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - SHIFT FORK 3 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 3.

JUDGMENT 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 3 

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

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - SHIFT FORK 3 
REQUESTED BUT SHIFT FORK 4 
MOVEMENT>

The status with the shift fork position 6 mm (0.24 
inch) [4th gear side] or more, or with 

−6 mm (−0.24 

inch) [2nd gear side] or less, or with 1.8 mm (0.071 
inch) [neutral position] or less and with the initialized 
fork position 

− shift fork 3 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. P1844 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 P184B: Shift Fork 4 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 4 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The movement of the shift fork 4 is determined to be 
abnormal.

.

MONITOR EXECUTION

• Continuous

.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-172

MONITOR EXECUTION CONDITIONS 
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• P1844: Shift fork 3 malfunction

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

LOGIC FLOW CHARTS (Monitor Sequence) <Functional check - blocked>

.

DTC SET CONDITIONS <FUNCTIONAL 
CHECK - BLOCKED>

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.

• Common high side 1 voltage: 2.5 V or more.

• Common high side 3 voltage: 2.5 V or more.

JUDGMENT CRITERIA

•

• Shift fork operation time: Shift fork operation time 

(threshold value) or more. (immediately)

• Shift fork operation time (threshold value): Equal 

the maximum allowed time x Coefficient. (imme-
diately)

.

OBD-II DRIVE CYCLE PATTERN 
<FUNCTIONAL CHECK - BLOCKED>

The shift fork operation time is threshold value or 
less.

.

AC710675

START

No

Good

Malfunction

END

Yes

Malfunction criteria met

Yes

Monitoring condition met

No

AC710827

Maximum allowed time (sec)

25

20

15

10

5

-40

-20

0

20

120

Fluid temperature [˚C (˚F)]

AB

1 Until completion of initial shift fork action
2 After completion of initial shift fork action

(-40)

(-4)

(32)

(68)

(248)

AC710826

1.5

4,000

8,000

16,000

Line pressure (mbar)

1.25

1

Coefficient

AB