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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Automatic Transmission - 9T50 (M3D) And 9T60 (M3T) - Description And Operation) >> Description and Operation >> Park - Engine Running (Hydraulic Circuits) >> Fluid Pressure Directed in Preparation for a Shift

Fluid Pressure Directed in Preparation for a Shift

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Manual Valve 

Mechanically controlled by the gear selector lever, the manual valve is in the Park (P) position and prevents line pressure from the pressure regulator valve from entering the reverse and drive circuits.

1 Reverse & 6789 Regulator Valve 

The 1 Reverse & 6-7-8-9 solenoid is energized which applies pressure against the 1 Reverse & 6-7-8-9 Regulator Valve spring force. This allows line fluid to be blocked from entering the 1 REV/6789 FEED fluid circuit.

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