Mitsubishi Lancer Evolution X. Manual - part 545

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-137

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.
Q: Is DTC No. P1821 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 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 4.

STEP 4. Replace the mechatronic assembly, and check if 
the DTC is reset.
(1) Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

(2) Perform a test run of the vehicle.
(3) Check the DTC.
Q: Is DTC No.P1821 set?

YES : Replace the transaxle assembly. (Refer to 

P.22C-412

.)

NO :  This diagnosis is complete.

DTC P1822: Shift Fork Position Sensor 1 System (Output range out)

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 output of the shift fork 
position sensor 1 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The output of the shift fork position sensor 1 is deter-
mined to be abnormal.

.

MONITOR EXECUTION

• Continuous

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-138

MONITOR EXECUTION CONDITIONS 
(OTHER MONITOR AND SENSOR)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• P1820: Shift fork position sensor 1 system (Volt-

age low range out)

• P1821: Shift fork position sensor 1 system (Volt-

age high range out)

• P1823: Shift fork position sensor 1 system (Neu-

tral)

• P1824: Shift fork position sensor 1 system (Poor 

performance)

• P1836: Shift fork 1 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

.

LOGIC FLOW CHARTS (Monitor Sequence)

.

DTC SET CONDITIONS

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.

AC710681

START

No

Good

Malfunction

END

Continuous failure
for 180 msec

No

Yes

Yes

Yes

No

No

Shift fork position
counter < -500

Yes

Shift fork position
counter > 500

Monitoring condition met

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-139

• Shift system status: Gear change mode (during 

shift fork moving).

JUDGMENT CRITERIA

• Shift fork 1 position counter (digitized sensor 

value): −500 counts or less, or shift fork 1 position 

counter (digitized sensor value): 500 counts or 
more. (180 millisecond)

.

OBD-II DRIVE CYCLE PATTERN

The status with the shift fork 1 position counter (digi-
tized sensor value) −500 counts or more, or with the 

shift fork 1 position counter (digitized sensor value) 
500 counts or less continues for 180 milliseconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU
• Malfunction of shift fork position sensor 1

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 5 seconds or more.)

(3) Check that the DTC is reset.
Q: Is DTC No.P1822 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 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 4.

DIAGNOSIS <TC-SST>

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TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-140

STEP 4. Replace the mechatronic assembly, and check if 
the DTC is reset.
(1) Replace the mechatronic assembly. (Refer to 

P.22C-421

.)

(2) With the engine idle status, operate the shift lever in the 

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

for 5 seconds or more.)

(3) Check the DTC.
Q: Is DTC No.P1822 set?

YES : Replace the transaxle assembly. (Refer to 

P.22C-412

.)

NO :  This diagnosis is complete.

DTC P1823: Shift Fork Position Sensor 1 System (Neutral)

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 1 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The shift fork position sensor 1 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)

• P1820: Shift fork position sensor 1 system (Volt-

age low range out)

• P1821: Shift fork position sensor 1 system (Volt-

age high range out)

• P1822: Shift fork position sensor 1 system (Out-

put range out)

• P1824: Shift fork position sensor 1 system (Poor 

performance)

• P1836: Shift fork 1 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

.