Envoy 2WD V6-4.3L VIN W (1998)
Torque Converter Clutch: Description and Operation
The Torque Converter Clutch (TCC) system uses controls that are internal as well as external to the transmission.
The TCC system includes the following external control components:
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Cruise Control Release Switch - In order to avoid stalling the engine when braking, the converter clutch releases anytime the brake pedal is
applied.
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Powertrain Control Module (PCM) - The PCM receives input signals and grounds TCC solenoid to apply clutch when the proper operating
conditions are met.
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Throttle Position (TP) Sensor - The TP Sensor sends throttle position information to the Powertrain Control Module (PCM).
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Vehicle Speed Sensor (VSS) - The VSS sends vehicle speed information to the Powertrain Control Module (PCM).
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Manifold Absolute Pressure (MAP) Sensor - The MAP Sensor sends engine vacuum (load) information to the Powertrain Control Module (PCM).
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Engine Coolant Temperature (ECT) Sensor The ECT Sensor sends engine coolant temperature information to the Powertrain Control Module
(PCM).
