Honda Prelude 1993 Service Manual page 488

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Lock-up System (cont'd)

Lock-uD Control Solenoid VaVe A: ON

Lock-up ControlSolenoid VaMe B: ON

When the vohicle speed further increases, the throttle B pressure is increased in accordance with the throttl€ opening.

The lock-up ttming valve overcomss the spring forca and moves to the left side. Also, this vslve closes the oil port leading to the

torou€ conv€rter chsck vave.

Under this condition, the throttle B pressura working on the right end ol the lock-up controlvalve becomes gleatsr than that on

the left end (modulator pressure in the lelt end has already been relessed by the solenoid vatue B); i.e., the lock-up controlvalve

is mov6d to ths l6ft. As this happ6ns, the torque convertar back pressure is released tully, causing the lock-up clutch to bs

€ng8ged Jully.

"left" or "right" indicates dir€ction on the flowchart.

THROTTLE B PRESSURE

MODULATOR PRESSURE

c o N l R O L l l

LOCKUP CONTROI

SOIENOID VALVE: A

T O R O U E C O N V E R T E R

C X E C K V A L V E

o r r c o o L E A

Troubleshooting