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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Description And Operation >> Automatic Transmission Hydraulic Diagrams >> Drive Range, Manual Third (from Overdrive Range) >> 1-2, 3-4 Shift Solenoid (SS) Valve (315)

1-2, 3-4 Shift Solenoid (SS) Valve (315)

When de-energized, it allows 1-2, 3-4 signal fluid from the 3-4 shift valve (362) to exhaust through the solenoid. However, this event does not have to occur in order to achieve a manual 4-3 downshift.