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Home >> Pontiac >> 2008 >> G5 Base, Automatic >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transaxle - 4T45-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Drive Range, Manual Third (from Overdrive Range) (W/O Electronic Range Select Mode) >> Fourth Gear Hydraulically Prevented >> Manual Valve

Manual Valve

The manual valve moves into the Manual Third (3) position and line pressure enters the D321 fluid circuit. Also the manual valve blocks line pressure from the PRND4 fluid circuit and the PRND4 fluid exhausts past the manual valve.