Torque Converter Clutch (TCC) Applies
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Cadillac Escalade ESV, and 2018 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
Torque Converter Clutch (TCC) Control Solenoid
The TCC control solenoid is commanded ON, allowing SECONDARY LINE fluid to enter the TCC SIGNAL fluid circuit. TCC VFS fluid is directed thru orifice #95 to the TCC accumulator piston and thru orifice #88 to the TCC control valve.
TCC Control Valve
TCC SIGNAL fluid moves the TCC control valve against TCC control valve spring force, allowing SECONDARY LINE fluid to pass through the valve into the TCC APPLY fluid circuit and apply the torque converter clutch. TCC release fluid passes through the TCC control valve and is exhausted.