Mitsubishi Evolution X. Manual - part 437

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-205

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1867 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 P1868: High side 2 system (Short to power supply)

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 high side 2 circuit is 
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The high side 2 circuit is determined to be short to 
power supply.

.

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)

• P0776: Clutch cooling flow solenoid system 

(Drive current range out)

• P0777: Clutch cooling flow solenoid system 

(Stuck)

• P0964: Clutch cooling flow solenoid system 

(Open circuit)

• P0965: Clutch cooling flow solenoid system 

(Overvoltage)

• P0966: Clutch cooling flow solenoid system 

(Short to ground)

• P0967: Clutch cooling flow solenoid system 

(Short to power supply)

• P2718: Clutch/shift pressure solenoid 1 system 

(Open circuit)

• P2719: Clutch/shift pressure solenoid 1 system 

(Overcurrent)

• P2720: Clutch/shift pressure solenoid 1 system 

(Short to ground)

• P2721: Clutch/shift pressure solenoid 1 system 

(Short to power supply)

• P2733: Clutch/shift switching solenoid 1, spool 

stuck

• P2736: Clutch/shift switching solenoid 1 system 

(Open circuit)

• P2738: Clutch/shift switching solenoid 1 system 

(Short to ground)

• P2739: Clutch/shift switching solenoid 1 system 

(Short to power supply)

• P181B: Clutch 1 (Pressure low range out)

• P181C: Clutch 1 (Pressure high range out)

• P1859: Disengagement too late with clutch 1

Sensor (The sensor below is determined to be 

normal)

• Clutch cooling flow solenoid

• Clutch/shift pressure solenoid 1

• Clutch/shift switching solenoid 1

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-206

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.

• High side 2 switch: OFF.

JUDGMENT CRITERIA

• FET (Field Effect Transistor): Can’t be switched 

off. (12 seconds)

.

OBD-II DRIVE CYCLE PATTERN

The FET switch remains OFF for 12 seconds.

.

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.

AC710727

START

No

Good

Malfunction

END

Continuous failure
for 12 sec

No

Yes

Yes

Monitoring condition met

Yes

No

FET* can't switched off

*FET : Field Effect Transistor

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-207

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. P1868 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 P186A: High side 3 system (Overcurrent)

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 high side 3 circuit is 
normal.

.

DESCRIPTIONS OF MONITOR METHODS

The supply current to the high side 3 is determined to 
be overcurrent.

.

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)

• P0753: Shift select solenoid 1 system (Open cir-

cuit)

• P0973: Shift select solenoid 1 system (Short to 

ground)

• P0974: Shift select solenoid 1 system (Short to 

power supply)

• P2727: Clutch/shift pressure solenoid 2 system 

(Open circuit)

• P2728: Clutch/shift pressure solenoid 2 system 

(Overcurrent)

• P2729: Clutch/shift pressure solenoid 2 system 

(Short to ground)

• P2730: Clutch/shift pressure solenoid 2 system 

(Short to power supply)

• P2809: Clutch/shift switching solenoid 2, spool 

stuck

• P2812: Clutch/shift switching solenoid 2 system 

(Open circuit)

• P2814: Clutch/shift switching solenoid 2 system 

(Short to ground)

• P2815: Clutch/shift switching solenoid 2 system 

(Short to power supply)

• P181B: Clutch 1 (Pressure low range out)

• P181C: Clutch 1 (Pressure high range out)

• P1859: Disengagement too late with clutch 1

• P181E: Clutch 2 (Pressure low range out)

• P181F: Clutch 2 (Pressure high range out)

• P185B: Disengagement too late with clutch 2

Sensor (The sensor below is determined to be 

normal)

• Shift select solenoid 1

• Clutch/shift pressure solenoid 2

• Clutch/shift switching solenoid 2

.

DIAGNOSIS <TC-SST>

TSB Revision

TWIN CLUTCH- SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22C-208

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.

• High side 3 switch: ON.

JUDGMENT CRITERIA

• FET (Field Effect Transistor) current: 8.1 A or 

more, and FET (Field Effect Transistor) output: 
100 mV or less. (1 second)

.

OBD-II DRIVE CYCLE PATTERN

The status with the current of the FET channel shunt 
8.1 A or less and with the FET channel output 100 
mV or more continues for 1 second.

.

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.

AC710725

START

No

Good

Malfunction

END

No

Yes

Yes

Yes

No

Monitoring condition met

FET* current > 8.1 A

Yes

No

FET* output < 100 mV

Continuous failure
for 1 sec

*FET : Field Effect Transistor