Hydraulic Controls

Hydraulic Control
The hydraulic control system is controlled by the ATF pump, the valves, and the solenoids. The ATF pump is driven by the input shaft. The ATF pump and the input shaft are linked by the ATF pump drive chain and the sprockets. Fluid from the ATF pump flows through the PH regulator valve to maintain specified pressure to the drive pulley, the driven pulley, and the manual valve.
The lower valve body assembly includes the main valve body, the secondary valve body, the CVT pulley pressure control valve assembly, the CVT start clutch pressure control valve assembly, and the CVT speed change control valve assembly.
The manual valve body is bolted on the intermediate housing, and housed manual valve. The manual valve switch hydraulic pressure to meet with the shift lever position.

Main Valve Body





The main valve body contains the PH control valve, the CPC valve, the cooler relief valve, and the lubrication check valve.
^ PH Control Valve
The PH control valve supplies PH control pressure (PHC) to the PH regulator valve to regulate PH pressure in accordance with the PH-PL control pressure (HLC). At kick-down, it increases PH control pressure which increases the PH pressure.
^ Lubrication Check Valve
The lubrication check valve stabilizes the lubrication pressure to the internal circuit.
^ Cooler Relief Valve
The cooler relief valve regulates ATF cooler pressure to the ATF cooler, and drain to the internal circuit.
^ CPC Valve
The CPC valve regulates clutch pressure to the start clutch.

Secondary Valve Body





The secondary valve body contains the PH regulator valve, the lubrication regulator valve, the clutch reducing valve, the start clutch accumulator valve, and the shift inhibitor valve.
^ PH Regulator Valve
The PH regulator valve maintains hydraulic pressure supplied from the ATF pump, and supplies PH pressure to the hydraulic control circuit and the lubrication circuit. PH pressure is regulated at the PH regulator valve by the PH control pressure (PHC) from the PH control valve.
^ Lubrication Regulator Valve
The lubrication regulator valve regulates lubrication pressure to the hydraulic circuit.
^ Clutch Reducing Valve
The clutch reducing valve receives PH pressure from the PH regulator valve and regulates the clutch reducing pressure (CR).
^ Start Clutch Accumulator Valve
The start clutch accumulator valve stabilizes the hydraulic pressure that is supplied to the start clutch.
^ Shift Inhibitor Valve
The shift inhibitor valve switches the fluid passage to switch the start clutch control from electronic control to hydraulic control when the electronic control system is faulty.

CVT Pulley Pressure Control Valve Assembly
The CVT pulley pressure control valve assembly contains the PL regulator valve and the HLC valve which is joined with the linear solenoid. The PL regulator valve supplies low pressure to the pulley to eliminate steel belt slippage. The HLC valve controls the PL regulator valve according to the engine torque. The HLC valve supplies PH-PL control pressure (HLC) to the PH control valve to regulate PH pressure higher than PL pressure. The HLC valve is controlled by the linear solenoid which is controlled by the PCM.
The inhibitor solenoid is bolted on the CVT pulley pressure control valve assembly, and supplies the SH-A pressure to the reverse inhibitor valve to control forward range and reverse range.

CVT Start Clutch Pressure Control Valve Assembly
The CVT start clutch pressure control valve assembly contains the start clutch control valve joined with the linear solenoid. The start clutch pressure control valve controls start clutch engagement according to the throttle opening. The start clutch control valve is controlled by the linear solenoid, which is controlled by the PCM.

CVT Speed Change Control Valve Assembly





The CVT speed change control valve assembly contains the pulley control valve and the SHC valve joined with the linear solenoid. The pulley control valve distributes PH pressure and PL pressure to the drive pulley and driven pulley, to shift the transmission. The SHC valve controls the pulley control valve by SHC pressure in accordance with the throttle opening and vehicle speed. The SHC valve is controlled by the linear solenoid, which is controlled by the PCM.

Manual Valve Body





The manual valve body contains the manual valve and the reverse inhibitor valve. The manual valve body in bolted on the intermediate housing.
^ Manual Valve
The manual valve mechanically uncovers/covers the fluid passage according to the shift lever position.
^ Reverse inhibitor Valve
The reverse inhibitor is controlled by the SH-A pressure from the reverse inhibitor solenoid. The reverse inhibitor valve intercepts the hydraulic circuit to the reverse brake while the vehicle is moving forward at speeds over about 6 mph (10 km/h).