|
|
Content .. 1182 1183 1184 1185 ..
Orificed D2 fluid pressure seats the #5 checkball against the empty overrun clutch fluid circuit. Overrun Clutch Piston A continuous supply of fluid pressure is routed to the piston in order to keep the overrun clutch Torque Converter Clutch The converter clutch is released prior to downshifting into manual second-second gear. Under Pressure Control (PC) Solenoid Valve The PCM output signal to the PC solenoid valve increases the operating range of torque signal IMPORTANT: Some vehicles in Manual Second Gear, at a stop, will start out in 1st gear, while others will have a second gear start. Refer to
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 557: Manual Second Gear MANUAL FIRST GEAR A manual 2-1 downshift can be accomplished by moving the gear selector lever into the manual Manual Valve The selector lever moves the manual shaft and the manual valve into the manual first (1) position. Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly Lo fluid is routed to the TFP manual valve position switch where it closes the normally open lo
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2-3 Shift Solenoid (SS) Valve In both first and second gears, this solenoid is energized and maintains the signal B fluid pressure 2-3 Shift Valve Train Held in the downshift position by the signal B fluid pressure from the solenoid, the valve train 1-2 Shift Solenoid (SS) Valve Below approximately 48 to 56 km/h (30 to 35 mph) the PCM energizes the normally open 1-2 Shift Valve Signal A fluid pressure moves the valve against the spring force and into the downshift position. 2-4 Band Releases 2-4 Servo Assembly The 2nd clutch fluid, which was fed by the 2nd fluid, exhausts from the servo. This allows the 1-2 Accumulator Assembly The 2nd clutch fluid also exhausts from the 1-2 accumulator assembly. The spring force and the Accumulator Valve As the accumulator fluid is filling the 1-2 accumulator assembly, the accumulator valve regulates
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
clutch fluid exhaust, and the 2-4 band release. 1-2 Upshift Checkball (#8) Exhausting the 2nd clutch fluid pressure unseats the ball and is routed through the 2nd fluid Lo and Reverse Clutch Applies Lo Overrun Valve The Lo/1st fluid is regulated through the lo overrun valve and into the Lo/reverse fluid circuit in Lo and Reverse Piston The Lo/reverse fluid pressure acts on the inner area of the piston in order to move the piston and Overrun Clutch Applied The overrun clutch remains applied in manual first in order to provide engine compression Pressure Control (PC) Solenoid Valve Similar to manual second, the PCM output signal to the PC solenoid valve increases the operating 3-2 Downshift Control Solenoid Valve and the 3-2 Control Valve In first gear the solenoid is OFF, the AFL fluid is blocked by the solenoid, and the 3-2 signal
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Content .. 1182 1183 1184 1185 ..
|
|
|