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OVERDRIVE RANGE, THIRD GEAR As vehicle speed increases further and other vehicle operating conditions are appropriate, the PCM de-energizes 2-3 Shift Solenoid (SS) Valve De-energized (turned OFF) by the PCM, the solenoid opens and actuator feed limit signal B fluid exhausts Note: AFL fluid continues to feed signal B fluid to the solenoid through orifice #29. However, the exhaust port 2-3 Shift Valve Train AFL fluid pressure at the 2-3 shift valve moves the valve train toward the solenoid. In the upshifted position, z AFL fluid is routed through the 2-3 shift valve and fills the D432 fluid circuit. z 2nd fluid is blocked from entering the servo feed fluid circuit and is orificed (#28) into the 3-4 signal z Servo feed fluid exhausts past the valve into the 3-4 accumulator fluid circuit and through an exhaust port 3-4 Clutch Exhaust Checkball (#4) 3-4 signal fluid unseats the ball and enters the 3-4 clutch fluid circuit. 3-4 Clutch Piston 3-4 clutch fluid pressure moves the piston to apply the 3-4 clutch plates and obtain 3rd gear. However, the 2-4 3rd Accumulator Checkball (#2) 3-4 clutch fluid pressure unseats the ball and fills the 3rd accumulator fluid circuit. 3rd Accumulator Exhaust Checkball (#7) 3rd accumulator fluid seats the ball against the orificed exhaust and is routed to the released side of the 2nd 2-4 Servo Assembly 3rd accumulator fluid pressure acts on the release side of the 2nd apply piston and assists servo return spring
2004 Hummer H2 2004 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E (Introduction) - Hummer H2
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