Hybrid Direct, 2-3-4 Clutch Applies

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Pressure Control (PC) Solenoid 2 Trim

The PC solenoid 2 trim is energized (ON) allowing actuator feed limit fluid to enter the PCS 2 signal circuit. PCS 2 signal fluid is then routed through orifice #38 to the hybrid direct, 2-3-4 clutch regulator valve.

Hybrid Direct, 2-3-4 Clutch Regulator Valve

PCS 2 signal fluid, at the hybrid direct, 2-3-4 clutch regulator valve, opposes hybrid direct, 2-3-4 clutch regulator valve spring force and HD 234 clutch feedback fluid pressure to regulate line or auxiliary line pressure into the HD 234 clutch/B cooling feed circuit.

#1 Encapsulated Ball Check Valve

HD 234 clutch feedback fluid unseats the #1 ball check valve, allowing excess pressure to pass into the actuator feed limit circuit. This helps to control clutch apply fluid pressure and clutch apply feel.

Shift Solenoid Valve - Mode A

HD 234 clutch/B cooling feed fluid passes through the shift solenoid valve - mode A into the HD 234 clutch supply fluid circuit and is routed to the shift solenoid valve - mode B.

Shift Solenoid Valve - Mode B

HD 234 clutch supply fluid passes through the shift solenoid valve - mode B into the HD 234 clutch circuit and is routed to the hybrid direct 2-3-4 clutch assembly.

Hybrid Direct, 2-3-4 Clutch Assembly

HD 234 clutch fluid is directed to the hybrid direct, 2-3-4 clutch piston to apply the hybrid direct, 2-3-4 clutch plates and achieve second gear.