Mitsubishi Lancer Evolution X. Manual - part 566

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-221

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 millisecond.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of valve body

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A

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-15

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
(1) Erase the DTC.
(2) With the engine idle status, operate the shift lever in the 

following sequence: P → R → D → R → P. (Hold each range 

for 1 second or more.)

(3) Check that the DTC is reset.
Q: Is the DTC No. P1852 set?

YES : Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

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-222

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

.

LOGIC FLOW CHARTS (Monitor Sequence) <Functional check - move opposite 
direction right side>

.

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-223

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: 650 r/min or more.
• Time since above engine condition: 1.5 seconds 

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 millisecond.

.

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: 650 r/min or more.

• Time since above engine condition: 1.5 seconds 

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)

.

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-224

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 millisecond.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of valve body

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A

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-15

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
After driving in the 4th gear, check that the DTC is reset.
Q: Is the DTC No. P1855 set?

YES : Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

DTC P1857: Odd number gear axle interlock

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 gear engagement is 
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The two gears are determined to be engaged in the 
odd number gear range.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.