Shift Solenoid: Description and Operation

1-2 SHIFT SOLENOID VALVE





The PCM controls the ground for the 1-2 Shift Solenoid (1-2 SS) valve, thereby commanding the solenoid ON or OFF according to transmission and vehicle operation. When the solenoid is OFF, filtered line pressure that is fed to the solenoid will cease. When energized (ON), the exhaust port is blocked, stopping the exhaust of line pressure through the solenoid. Pressure on the end of the 1-2 shift solenoid valve moves the valve against a spring force, sending line pressure into the 1-2 shift solenoid fluid passage to the 3-4 shift valve.

2-3 SHIFT SOLENOID VALVE





The 2-3 Shift Solenoid (2-3 SS) valve functions identically to the 1-2 Shift Solenoid valve in that the PCM controls the ground to the solenoid, commanding it ON or OFF.When the solenoid is OFF, filtered line pressure feeding the solenoid will cease. When energized (ON), the exhaust port is blocked stopping the exhaust of line pressure and directing it into the 2-3 shift solenoid fluid passage. The 2-3 shift solenoid fluid pressure then feeds to the 4-3 manual downshift valve and the 3-2 manual downshift valve.