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The accumulator fluid forced from the accumulator unseats the #1 checkball and enters the Accumulator Valve Accumulator fluid forced from the 3-4 accumulator is orificed to the end of the accumulator 3-2 Control Solenoid Valve and 3-2 Control Valve The solenoid remains open and routes AFL fluid into the 3-2 signal fluid circuit. 3-2 signal fluid Torque Converter Clutch Applies TCC Solenoid Valve When operating conditions are appropriate, the PCM energizes the normally open TCC solenoid Converter Clutch Apply Valve Converter feed fluid pressure moves the valve against spring force and into the apply position. In Torque Converter Release fluid from behind the pressure plate exhausts through the end of the turbine shaft. Apply TCC Apply Checkball (#9) Release fluid, exhausting from the converter, seats the #9 checkball located in the end of the
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
turbine shaft, and is orificed around the ball. Orificing the exhausting release fluid controls the TCC PWM Solenoid Valve The torque converter clutch pulse width modulation (TCC PWM) solenoid valve controls the Fig. 553: Overdrive Range, Fourth Gear - TCC Applied OVERDRIVE RANGE, 4-3 DOWNSHIFT When the transmission is operating in fourth gear, a forced 4-3 downshift occurs if there is a
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
fluid pressure and the spring force move the piston into a third gear position. 3-4 Accumulator Checkball (#1) As the accumulator fluid fills the 3-4 accumulator, it seats the #1 checkball and is forced through Accumulator Valve Biased by torque signal fluid pressure and spring force, the accumulator valve regulates the D-4 2-3 Shift Solenoid (SS) Valve This solenoid remains de-energized as in fourth gear and the signal B fluid exhausts through the 2-3 Shift Valve Train The AFL fluid pressure at the 2-3 shift valve holds the valves in the upshift position. This allows Torque Converter Clutch Solenoid Valve TCC PWM Solenoid Valve The PCM de-energizes the TCC solenoid valve, and operates the duty cycle of the TCC PWM Pressure Control (PC) Solenoid Valve Remember that the PC solenoid valve continually adjusts the torque signal fluid pressure in
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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