Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
The shift solenoid #2 is energized and de-energized by the Powertrain Control Module (PCM) in response to varying transaxle shift demands. With the shift solenoid #2 de-energized, line pressure is applied to the 1-2 shift valve. With the line pressure applied, the 1-2 shift operates, and the transaxle shifts from second to third gear. When the PCM energizes the shift solenoid #1, line pressure is relieved, and the 1-2 shift valve does not operate.