Hybrid Low, 1-2 Clutch Remains Applied

WARNING: This page is about a different variant/trim than selected.

Pressure Control (PC) Solenoid 3 Trim

The PC solenoid 3 trim defaults to its normally high state (ON) allowing actuator feed limit fluid to enter the PCS 3 signal circuit. PCS 3 signal fluid is then routed through orifice #34 to the hybrid low, 1-2 clutch regulator valve; through orifice #33 to the hybrid low, 1-2 clutch boost valve; and to the shift solenoid valve - mode B.

Hybrid Low, 1-2 Clutch Boost Valve

PCS 3 signal fluid pressure acts on a differential area of the hybrid low, 1-2 clutch boost valve, moving the valve against hybrid low, 1-2 clutch boost valve spring force to block HL 12 clutch/4th clutch feed fluid from entering the HL 12 clutch/4th clutch feedback circuit, and opening the HL 12 clutch/4th clutch feedback circuit to exhaust. This results in the hybrid low, 1-2 clutch regulator valve moving to the full feed position, sending full HL 12 clutch/4th clutch feed pressure (full line pressure) to the hybrid low, 1-2 clutch.

Hybrid Low, 1-2 Clutch Regulator Valve

PCS 3 signal fluid moves the hybrid low, 1-2 clutch regulator valve, against hybrid low, 1-2 clutch regulator valve spring force, to the applied position. This allows line or auxiliary line fluid to pass through the valve into the HL 12 clutch/4th clutch feed circuit.

Shift Solenoid Valve - Mode B

HL 12 clutch/4th clutch feed fluid is routed to the shift solenoid valve - mode B, where it passes through the valve into the HL 12 clutch circuit.

Hybrid Low, 1-2 Clutch Assembly

HL 12 clutch fluid pressure enters the rear case assembly behind the hybrid low, 1-2 clutch piston and moves the piston against spring force to apply the hybrid low, 1-2 clutch plates.

1-3 Clutch Releases

If the transmission is operating in First gear when an electrical malfunction occurs, the normally closed shift solenoid 1 and the normally low pressure control solenoid 4 trim default to their normal states (OFF) and the 1-3 clutch is released. Refer to Drive Range, Second Gear for a complete description of 1-3 clutch release.