Bonneville V6-231 38L (1984) - Torque Converter Clutch, A/T - Technical Service Bulletins
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Torque Converter Clutch: Description and Operation
Solenoid--mounted in the automatic transmission--locks-up the torque converter when activated by the ECM.
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When the vehicle reaches a specified speed the ECM energizes the solenoid---causing the torque converter to mechanically couple the engine
to the transmission.
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When the brake is applied, or other conditions indicate that the transmission should operate as a normal--fluid coupled--transmission the ECM
de-energizes the solenoid.