Mitsubishi Eclipse. Technical Information Manual (1994) - part 45

POWER TRAIN 

 Automatic Transaxle

Second Gear EMCC
When conditions allow for it, the TCM pulses or
modulates the LWCC solenoid. This is called Elec-
tronically Modulated Converter Clutch (EMCC), as
mentioned earlier. By pulsing or modulating the sole-
noid, the TCM can lower the line pressure that
passes through the solenoid before reaching the
converter clutch and torque converter control valves.
When the modulated pressure reaches the two
valves, it fully moves the T/C control valve to the

SECOND GEAR

EMCC

SECOND GEAR

 

 

 

 

 

 

left, but only partially moves the CC control valve.
When the T/C control valve moves, it vents the

fluid from the front side of the torque converter pis-
ton. At the same time, the CC control valve provides

modulated pressure to the back side of the torque

converter piston. This condition does not cause the
torque converter piston to fully engage but instead

regulates the amount of slippage (partial engage-
ment).

 

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LR   Low reverse
UD   Underdrive

   Reverse

AC   Accumulator

PT   Pressure tap

S   Solenoid

24   2-4 clutch
OD   Overdrive

SW   Switch
CC   Converter CL

D   Dribbler

V   Vent

 

 

POWER TRAIN   Automatic Transaxle

Direct Gear (Third)

To shift into direct gear, the TCM energizes the

 and overdrive solenoids. This feeds line pres-

sure to the underdrive and overdrive clutches. Line
pressure from the overdrive clutch circuit is directed
to an area between two large plugs at the end of
the solenoid switch valve. This keeps the solenoid
switch valve shifted to the left. The redirected line

pressure from the overdrive clutch circuit allows
for torque converter clutch engagement. It also takes
the place of second gear line pressure, that was

DIRECT GEAR

holding the valve to the left but has now been vented.

The line pressure has also been reduced by using

line pressure from the same overdrive clutch circuit

that keeps the solenoid switch valve moved to the

left. Line pressure is directed to an area between

the regulator valve and the smaller of the two valves
on the end. This aids in moving the regulator valve
to the left, dumping additional oil, which results in

lower line pressure.

LR   Low reverse
UD   Underdrive

   Reverse

AC   Accumulator

PT   Pressure tap
S   Solenoid.

24   2-4 

clutch

OD   Overdrive
SW   Switch
CC   Converter CL

D   Dribbler

   Vent

DIRECT GEAR

 

 

 

 

 

 

 

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POWER TRAIN 

 Automatic Transaxle

Direct Gear EMCC

Direct gear EMCC is accomplished the same way

as second gear EMCC. Whenever the TCM 

transaxle cooler to help improve transaxle cooling.

vates EMCC, it provides full line pressure from the

For a review of EMCC operation, refer to Second

Gear EMCC.

regulator valve through the T/C control valve to the

DIRECT GEAR

LR   Low reverse
UD   Underdrive

   Reverse

AC   Accumulator

PT   Pressure tap

S   Solenoid

DIRECT GEAR

 

 

 

 

 

 

 

   

 

24   2-4 clutch
OD   Overdrive
SW   Switch
CC   Converter CL

D   Dribbler

   

POWER TRAIN 

 Automatic Transaxle

Direct Gear CC On
In direct gear, when the torque converter clutch

full line pressure to the ends of the T/C and CC

is fully engaged it is called CC On. The solenoid

control valves. Both the valves shift to the left. This

and valve configuration for this position is the same

allows the T/C control valve to fully vent the pressure

as direct gear EMCC except the 

 solenoid

on the front side of the torque converter piston,

is fully energized instead of pulsed or modulated.

causing full engagement.

When the 

 solenoid is energized, it sends

DIRECT GEAR
CC ON

LR   Low reverse
UD   Underdrive

   Reverse

AC   Accumulator

PT   Pressure tap
S   Solenoid

24   2-4 clutch
OD   Overdrive
SW   Switch
CC   Converter CL

D   Dribbler

U   

DIRECT GEAR

CC ON

 

 

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