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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 >> Park - Engine Running >> Pressure Regulation

Pressure Regulation

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 Regulator Valve 

This valve regulates the pump output in response to several forces: torque signal, fluid pressure, reverse gear, orificed line pressure and spring force. Line pressure from this valve is then routed to the actuator feed limit valve, the 1-2 & 3-4 accumulator valve, the 2-3 accumulator valve, and the converter clutch regulating valve.

Actuator Feed Limit Valve 

The line pressure is limited to a maximum force as it passes through the actuator feed limit valve and enters the actuator feed circuit. Actuator feed is then routed to the pressure control solenoid valve, and into the fluid circuits of the 1-2 and the 2-3 shift solenoid valves.

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