K 3500 Truck 4WD V8-379 6.2L DSL VIN C FI (1992)
Torque Converter Clutch: Component Tests and General Diagnostics
Torque Converter Clutch Circuit
Circuit Description:
The purpose of the automatic Torque Converter Clutch (TCC) feature is to eliminate the power loss of the torque converter stage when the vehicle
is in a cruise condition. This allows the convenience of the automatic transmission and the fuel economy of a manual transmission.
Fused battery voltage is supplied to the TCC solenoid through the TCC brake switch.
The ECM will engage TCC by grounding CKT 422 to energize the solenoid.
The ECM completes the circuit whenever the TPS exceeds a calibrated valve for throttle opening.
