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driving up a steep incline. To achieve a 4-3 downshift, the PCM de-energizes the 1-2 shift 1-2 Shift Solenoid (SS) Valve De-energized by the PCM, the normally open solenoid opens and signal A fluid exhausts through 1-2 Shift Valve As in Fourth gear, D432 fluid pressure and spring force hold the valve in the upshift position. 2-4 Band Releases 3-4 Shift Valve With the signal A fluid pressure exhausted, the spring force moves the valve into the downshift 3-4 Relay Valve and 4-3 Sequence Valve These valves control the timing of the 2-4 band release. With the 4th signal fluid pressure When the exhausting 3-4 accumulator fluid pressure decreases sufficiently, the spring force moves 2-4 Servo Assembly The 4th fluid exhausts from the 4th apply piston in the servo assembly. The apply pin spring 3-4 Accumulator Assembly The 3-4 accumulator fluid exhausts from the 3-4 accumulator piston. The orificed accumulator
2007 Hummer H3 2007 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - H3
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