1-3 Clutch Applies

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Pressure Control (PC) Solenoid 4 Trim

The PC solenoid 4 trim is energized (ON) allowing actuator feed limit fluid to enter the PCS 4 signal circuit. PCS 4 signal fluid is then routed through orifice #36 to the 1-3 clutch regulator valve.

1-3 Clutch Regulator Valve

PCS 4 signal fluid, at the 1-3 clutch regulator valve, opposes 1-3 clutch regulator valve spring force and 13 clutch feedback fluid pressure to regulate line or auxiliary line pressure into the 13 clutch/A cooling feed circuit.

#2 Encapsulated Ball Check Valve

13 clutch feedback fluid unseats the #2 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

Solenoid 1 signal fluid is routed to the shift solenoid valve - mode A and moves the valve against shift solenoid valve - mode A spring force to the applied position. This allows 13 clutch/A cooling feed fluid to enter the 13 clutch circuit.

1-3 Clutch Assembly

13 clutch fluid enters the transmission case assembly and moves the 1-3 clutch piston against spring force to apply the 1-3 clutch plates.

#4 Pressure Switch

Solenoid 1 signal fluid passes through the 1-3 clutch regulator valve into the PS4 fluid passage. PS4 fluid opens the normally closed #4 pressure switch, signaling the TCM that the transmission is in Drive Range - Third Gear.