Mitsubishi Evolution X. Manual - part 414

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-113

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1823 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 P1824: Shift Fork Position Sensor 1 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 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)

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

tral)

• 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

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-114

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 1 current gear: 1st gear>

.

DTC SET CONDITIONS <SHIFT FORK 1 
CURRENT GEAR: 1ST GEAR>

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.

• Input shaft 1 (odd) speed: 500 r/min or more.

• Shift fork 1 current gear: 1st gear.

• Synchro (1st gear) slip speed: 80 r/min or more.

• Requested shift fork: Not shift fork 1.

JUDGMENT CRITERIA

• Shift fork 1 position: 6 mm (0.24 inch) or less. 

(250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN <SHIFT 
FORK 1 CURRENT GEAR: 1ST GEAR>

The travel distance of the shift fork 1 remains 6 mm 
(0.24 inch) or more for 250 milliseconds.

.

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>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-115

LOGIC FLOW CHARTS (Monitor Sequence) <Shift fork 1 current gear: Reverse gear>

.

DTC SET CONDITIONS <SHIFT FORK 1 
CURRENT GEAR: REVERSE GEAR>

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.

• Input shaft 1 (odd) speed: 500 r/min or more.

• Shift fork 1 current gear: Reverse gear.

• Synchro (reverse gear) slip speed: 80 r/min or 

more.

• Requested shift fork: Not shift fork 1.

JUDGMENT CRITERIA

• Shift fork 1 position: −6 mm (−0.24 inch) or more. 

(250 millisecond)

.

OBD-II DRIVE CYCLE PATTERN <SHIFT 
FORK 1 CURRENT GEAR: REVERSE 
GEAR>

The travel distance of the shift fork 1 remains 

−6 mm 

(

−0.24 inch) or less for 250 milliseconds.

.

PROBABLE CAUSES

• Malfunction of TC-SST-ECU

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.

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)

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-116

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1824 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 P1825: Shift Fork Position Sensor 2 System (Voltage low 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 voltage of the shift fork 
position sensor 2 is normal.

.

DESCRIPTIONS OF MONITOR METHODS

The voltage of the shift fork position sensor 2 is too 
low.

.

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)

• 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)

• P1829: Shift fork position sensor 2 system (Poor 

performance)

• 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

.