Mitsubishi Lancer Evolution X. Manual - part 550

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-157

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 3rd gear, check that the DTC is reset.
Q: Is DTC No.P1828 set?

YES : Go to Step 3.
NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 3. Scan tool diagnostic trouble code for other 
systems
Check if a shift fork and shift fork position sensor-related diag-
nostic trouble code No. other than P1828 is stored.
Q: Is the DTC set?

YES : Go to Step 5.
NO :  Go to Step 4.

STEP 4. Scan tool Teach-In
(1) Carry out the Item No. 1: Plausibility check. (Refer to 

Special Function (Teach-In Reference Table 

P.22C-365

).) 

(2) After Teach-In, check which result ("Yes" or "No") is 

displayed in the Data list No. 101: Normal End. (Refer to 
Special Function (Teach-In Reference Table 

P.22C-365

).)

Q: Which is displayed, "Yes" or "No"?

"Yes" : Replace the transaxle assembly. (Refer to 

P.22C-412

.)

"No" : Go to Step 5.

STEP 5. Replace the mechatronic assembly, and check if 
the DTC is reset.
After driving in the 3rd gear, check that the DTC is reset.
Q: Is DTC No.P1828 set?

YES : Replace the transaxle assembly. (Refer to 

P.22C-412

.)

NO :  This diagnosis is complete.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-158

DTC P1829: Shift Fork Position Sensor 2 System (Poor performance)

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 shift fork position sen-
sor 2 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The shift fork position sensor 2 is determined 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)

• P1825: Shift fork position sensor 2 system (Volt-

age low range out)

• P1826: Shift fork position sensor 2 system (Volt-

age high range out)

• P1827: Shift fork position sensor 2 system (Out-

put range out)

• P1828: Shift fork position sensor 2 system (Neu-

tral)

• P183D: Shift fork 2 malfunction
• P1852: Shift fork 1 or 2 opposite direction move-

ment

• P1855: Shift fork 3 or 4 opposite direction move-

ment

• P1857: Odd number gear axle interlock
• P1876: Gear block 1st
• P1877: Gear block 2nd
• P1878: Gear block 3rd
• P1879: Gear block 4th
• P187A: Gear block 5th
• P187B: Gear block 6th
• P187C: Gear block reverse

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-159

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 2 current gear: 5th gear>

.

DTC SET CONDITIONS <SHIFT FORK 2 
CURRENT GEAR: 5TH GEAR>

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.

• Input shaft 1 (odd) speed: 500 r/min or more.
• Shift fork 2 current gear: 5th gear.

• Clutch 1 (odd) transmit torque: 40 N⋅ m (30 ft-lb) 

or more.

• Requested shift fork: Not shift fork 2.

JUDGMENT CRITERIA

• Shift fork 2 position: 6 mm (0.24 inch) or less. 

(250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN <SHIFT 
FORK 2 CURRENT GEAR: 5TH GEAR>

The travel distance of the shift fork 2 remains 6 mm 
(0.24 inch) or more for 250 millisecond.

.

AC710682

START

No

Good

Malfunction

END

Monitoring condition met

Continuous failure
for 250 msec

No

Yes

Yes

Yes

No

Shift fork position
< 6 mm (0.24 inch)

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-160

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 2 current gear: 3rd gear>

.

DTC SET CONDITIONS <SHIFT FORK 2 
CURRENT GEAR: 3RD GEAR>

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.

• Input shaft 1 (odd) speed: 500 r/min or more.
• Shift fork 2 current gear: 3rd gear.
• Clutch 1 (odd) transmit torque: 40 N⋅ m (30 ft-lb) 

or more.

• Requested shift fork: Not shift fork 2.

JUDGMENT CRITERIA

• Shift fork 2 position: −6 mm (−0.24 inch) or more. 

(250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN <SHIFT 
FORK 2 CURRENT GEAR: 3RD GEAR>

The travel distance of the shift fork 2 remains −6 mm 

(−0.24 inch) or less for 250 millisecond.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of shift fork position sensor 2

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

AC710683

START

No

Good

Malfunction

END

Monitoring condition met

Continuous failure
for 250 msec

No

Yes

Yes

Yes

No

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