Second Clutch Applied

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

1-2 Shift Solenoid Valve

The normally open shift solenoid valve is de-energized and 1-2 signal fluid exhausts through the open valve.

1-2 Shift Valve

IMPORTANT: Filtered actuator feed fluid continues to feed the 1-2 signal fluid circuit through orifice #7. However, the exhaust port through the solenoid is larger than orifice #7 in order to prevent a pressure increase in the 1-2 signal fluid circuit.

With 1-2 signal fluid pressure exhausted, a spring force moves the valve into the upshifted position. Drive fluid is routed into the 2-3 drive fluid circuit. Drive fluid also continues to flow through the valve and to the A/T Fluid Pressure Manual Valve Position Switch.

#2 Checkball (Second Clutch Apply)

The 2-3 drive fluid seats the #2 checkball, forcing the 2-3 drive fluid through the #3 orifice and feeding the second clutch fluid circuit. the #3 and the #4 orifices help to control the apply feel of the second clutch.

Second Clutch

The second clutch fluid pressure applies the second clutch, which shifts the transmission into Second gear.