K 1500 Truck 4WD V8-5.7L VIN R (1997)
Torque Converter Clutch: Testing and Inspection
Description - TCC Electrical Controls - 4L80-E
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:
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Brake Release Switch - To avoid stalling the engine when braking, the converter clutch is released any time the brakes are applied.
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Powertrain Control Module or Vehicle Control Module - Receives input signals and grounds TCC solenoid to apply clutch when the proper
operating conditions are met.
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Throttle Position Sensor - Sends throttle position information to the Powertrain Control Module or the Vehicle Control Module.
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Vacuum Sensor - Sends engine vacuum (load) information to the Powertrain Control Module or the Vehicle Control Module.
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Vehicle Speed Sensor - Sends vehicle speed information to the Powertrain Control Module or the Vehicle Control Module.
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Engine Coolant Temperature Sensor - Sends engine coolant temperature information to the Powertrain Control Module or the Vehicle Control
Module.
