Honda Prelude 1993 Service Manual page 486

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Lock-up System (cont'd)

Partial Loqk-up

Lock-up Control Solenoid Valve A: ON

The TCM switches the solenoid valve

modulator pressure in the right cavity

moved to the left side,

Lock-up ControlSolenoid Vslve B: OFF

A on to release the modulator pressure in the lett cavity of the lock-up shift valve' Tho

ot the lock-up shilt valve overcomes the spring forc8, thus the lock-up shitt valve is

The modulator pressure is separated to the two passages:

Torque Converter Inner Pressure: enters into right side-to engage lock-up clutch

Torque Converter Back Pressure: enters into left side-to disengage lock-up clutch

The bici pressure (FA is regulated by the lock-up control vave whereas the position ot the lock-up timing valve is doterminad

by the throttle B pressure, tension ot the valve spring and pressure regulated by the modulator. Also the

position oJ the lock-up

controlvalve is determinded by the back pressuie oithe lock-up controlvalve and torque converter

p.essure r€gulated by the

check valve. With the lock-up controlsolenoid valve B kept oJf, ihe modulator pressure is maintained in the left

end of th€ lock-

,p--nt-iu"V";

in other woios, the tock-up control vave is moved slightly to the leJt side. This slight movement of the lock-up

controlvalve causes the back pressure to be lowered slightly, resutting in partial lock-up'

"left" or "right" indicates direction on the tlowchart.

MODULATOR PRESSURE

LOC(UP CONTFOL

S O L E N O I D V A L v E : B

T O R O I J E C O N V E R T € A

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