As the vehicle speed increases, TCM receives input signals from the two speed sensors, TP sensor, and other vehicle sensors to determine the precise moment to de-energize or turn OFF the 2-3 SS. When TCM removes the ground from the circuit, the 2-3 solenoid turns OFF. The operation makes the 2-3 SS valve drain 2-3 signal fluid.

Intermediate Clutch Apply

2-3 SS valve: 2-3 SS valve is de-energized to prevent the feed limit fluid flowing into 2-3 signal fluid passage. 2-3 signal fluid pressure is drained through 2-3 SS valve and the 2-3 shift valve spring (372) tension moves the 2-3 shift valve (371) to the released position.

2-3 Shift Valve: 2345 fluid is sent to intermediate clutch fluid circuit through 2-3 shift valve.

Intermediate Clutch: The intermediate clutch fluid flows into intermediate clutch piston and applies the intermediate clutch plate to shift to 3rd gear.

Shift Accumulator

Intermediate Clutch Accumulator: The intermediate clutch fluid is also sent to the intermediate clutch accumulator assembly. Intermediate Clutch Fluid with accumulator spring tension to make the intermediate clutch accumulator piston overcome the accumulator fluid pressure to absorb the impact when the intermediate clutch applies.

TCC Release

TCC PWM Solenoid Valve: The filtered 2345 or reverse fluid remain in the TCC PWM solenoid valve. But according to shift pattern, TCM will remain the PWM solenoid OFF to prevent the filtered 2345 or Reverse fluid flowing into TCC signal fluid passage to keep the TCC released.

Fluid Pressure Directed in Preparation for 4th Gear

2-3 Shift Valve: 2345 fluid is sent to 345 fluid circuit through 2-3 shift valve (371).

X-4 Ball Check Valve: 345 fluid is sent through X-4 ball check valve sleeve. Some type of Transmission have a ball check valve which can make 345 fluid flow through valve bore #25.

3-4 Shift Valve: 345 fluid is sent to 3-4 shift valve (345) and is prevented by the valve to be ready to upshift to 4th gear.