Torque Converter Clutch: Testing and Inspection

The torque converter clutch (TCC) system uses controls that are internal as well as external to the transmission.

The external control components of the TCC system include:
^ Brake Release Switch - To avoid stalling the engine when braking, the converter clutch is released any time the brakes are applied.
^ Powertrain Control Module or Vehicle Control Module - Receives input signals and grounds TCC solenoid to apply clutch when the proper operating conditions are met.
^ Throttle Position Sensor - Sends throttle position information to the Powertrain Control Module or the Vehicle Control Module.
^ Vacuum Sensor - Sends engine vacuum (load) information to the Powertrain Control Module or the Vehicle Control Module.
^ Vehicle Speed Sensor - Sends vehicle speed information to the Powertrain Control Module or the Vehicle Control Module.
^ Engine Coolant Temperature Sensor - Sends engine coolant temperature information to the Powertrain Control Module or the Vehicle Control Module.