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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Overdrive Range, 4-3 Downshift >> Line Pressure Increases

Line Pressure Increases

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Pressure Control (PC) Solenoid Valve 

The change in throttle position (increase in percentage of travel) signals the PCM to increase the PC solenoid valve's OFF cycle time. When this occurs, higher filtered actuator feed pressure passes through the PC solenoid valve into the torque signal fluid passage.

Pressure Regulator Valve 

Torque signal fluid, acting on the end of the valve, causes the valve to move against orificed line pressure at the other end of the valve. This movement of the valve increases line pressure in the hydraulic circuits.

Actuator Feed Limit Valve 

Increased line pressure passes through the valve and the pressure enters the actuator feed circuit. Actuator feed fluid is routed through the force motor feed filter and then the fluid is routed into the filtered actuator feed circuit. Filtered actuator feed is then sent to the PC solenoid valve.

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