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Home >> Chevrolet >> 2001 >> Cavalier LS, 2.2 4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 260 (Automatic Transaxle - 4T40-E/4T45-E - Overhaul) >> Description and Operation >> Overdrive Range, 4-3 Downshift - Torque Converter Clutch (TCC) Not Applied (W/o Electronic Range Select Mode) >> Line Pressure Increases >> Pressure Control Solenoid (PCS) Valve

Pressure Control Solenoid (PCS) Valve

WARNING: This page is about a different car, the 2004 Pontiac Sunfire, 2004 Chevrolet Classic, and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

During the downshift, except for a coastdown, the PCM senses the increase in the throttle position or the engine load. When this occurs the PCM increases the PCS duty cycle. The increase in duty cycle increases the output fluid pressure from the PCS, thereby increasing the torque signal fluid pressure at the torque signal regulator valve.

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