Mitsubishi Evolution X. Manual - part 149

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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WHEN DRIVING IN 1ST GEAR

During driving with the 1st gear, the even number 
gear clutch is kept released, and the 2nd gear is 
engaged in advance. (During driving with even num-
ber gears, the odd number gears are engaged in 
advance.)

.

AC705588AC

Shift fork (For 2nd speed
gear-4th speed gear)

Clutch (For odd number gear)

Input shaft (for even number gear)

Shift fork (For 1st speed
gear-reverse speed gear)

Center differential

Output shaft

Transfer gear

2nd speed gear

1st speed gear

Input shaft (For odd number gear)

Even number gear axle

Odd number gear axle

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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WHEN DRIVING IN 2ND GEAR

The clutch (for odd number gears) is released at the 
shifting timing in accordance with the shift map, and 
the clutch (for even number gears) is engaged to 
perform driving with the 2nd gear.

Because the shifting is performed only by the alter-
nation of two clutches, the shifting time is short, and 
the clutch does not become completely released dur-
ing driving.

AC705589 AC

2nd speed gear

Center differential

Clutch (for even number gear)

Input shaft (for even number gear)

To center differential

Shift fork (For 2nd speed
gear-4th speed gear)

Even number gear axle

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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HYDRAULIC MECHANISM

M2224000500019

By the operation of solenoid valve, the valve body 
feeds the hydraulic pressure needed for the opera-
tion of clutch and each shifting section. The solenoid 
valve is controlled by TC-SST-ECU, and the hydrau-
lic pump generates the hydraulic pressure by using 
the engine power.

Also, to prevent the oil performance drop, the oil 
cooler and oil filter are equipped.

AC705353

Clutch
(For odd
number gear)

Hydraulic pressure valve body 

Hydraulic pressure pump 

TC-SST-ECU

2nd, 4th, 6th 
shifting section

R,1st, 3rd, 5th
shifting section

AD

Engine

Clutch
(for even number gear)

AC705842AC

Oil cooler

Oil filter

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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CONTROL MECHANISM

M2224000600016

TC-SST-ECU communicates with various systems 
(engine control module, shift lever, twin clutch SST 
control mode switch, and others) to recognize the 
driver operation, driving condition, malfunction of 
systems, and others, and performs the correspond-
ing control of TC-SST assembly.

AC705196

Other ECUs (ASC, 
ACD, AYC, etc.)

ETACS-ECU

ENGINE-ECU

TC-SST-ECU

AC

Sensor

Shift
actuator

Clutch
actuator

Engine

Clutch

TC-SST-assembly

Combination meter

Brake
pedal

Accelerator
pedal

Shift lever

Vehicle 
speed, etc.

· Current gear

· Clutch temperature

· Fluid temperature

Gear shift
signal

Brake
ON, OFF

Current 
gear

· Engine torque request
· Engine speed request

· Engine torque
· Engine Turning

· Clutch engagement 

  force
· Clutch engagement 

  speed

· Shift position
· Drive mode

CAN-C

CAN-B

Harness

Mechanical link

LIN

· Current gear

Sensor

Parking lock
mechanism

Current 
gear

Name

Function content

TC-SST-ECU

• Incorporated into the TC-SST assembly. Controls the solenoid valve of valve 

body based on the driver operations and signals from sensors and ECUs, and 
performs the engagement and releasing of clutch as well as the gear shifting.

• By sending and receiving the information on engine torque, engine speed, 

shifted gear, and others with the engine control module, performs the 
integrated control of engine and TC-SST assembly.

Engine control module

By sending and receiving the information on engine torque, engine speed, 
shifted gear, and others with TC-SST-ECU, performs the integrated control of 
engine and TC-SST assembly.