2-3 Shift Solenoid (Normally Open)

2-3 Shift Solenoid - Located at the end of the 2-3 shift valve, the 2-3 shift solenoid is normally open and fed D32/1-2 fluid. When de-energized (off), D32/1-2 fluid pressure moves the solenoid checkball against the solenoid spring force. This also moves the plunger in the solenoid in order to block the exhaust port in the solenoid. D32/1-2 fluid flows past the ball and acts on the 2-3 shift valve. With the exhaust port blocked, the D32/1-2 fluid pressure at the end of the shift valve increases. The D32/1-2 fluid pressure moves the shift valve against the 2-3 shift valve spring force and into the 3rd and 4th gear position.

When energized (commanded on) by the TCM, the magnetic field created in the coil moves the plunger against the solenoid checkball. The force from the plunger assists the spring force and seats the ball against the fluid inlet port, thereby blocking D32/1-2 fluid. With the plunger in this position, residual D32/1-2 fluid at the end of the shift valve opens to the exhaust passage through the solenoid. This allows the shift valve spring force to move the 2-3 shift valve into the 1st and 2nd gear position.