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MANUAL SECOND GEAR A manual 3-2 downshift can be accomplished by moving the gear selector lever into the Manual Second (2) Manual Valve The selector lever moves the manual shaft and the manual valve into the manual second (2) position. This Transmission Fluid Pressure (TFP) Manual Valve Position Switch Assembly The D2 fluid is routed to the TFP manual valve position switch where it opens the normally closed D2 fluid Third and Fourth Gears Prevented 2-3 Shift Solenoid (SS) Valve The PCM energizes the 2-3 SS valve and the AFL fluid pressure holds the 2-3 shift valve in the downshift 2-3 Shift Valve Train The D2 fluid is routed between the 2-3 shuttle and the 2-3 shift valves and causes the following: z Regardless of the operating conditions, the D2 fluid pressure holds the 2-3 shift valve in the downshift z The 2nd fluid is blocked from entering the 3-4 signal fluid circuit and the 3-4 signal fluid circuit is open z The 3-4 clutch cannot apply with the 3-4 signal fluid exhausted. Therefore, third and fourth gears are z The 2nd fluid feeds the servo feed fluid circuit, but the 2nd fluid circuit has no function in manual second. z The AFL fluid is blocked by the 2-3 shift valve and the D432 fluid circuit is exhausted through the valve. z The overrun fluid is exhausted through the 2-3 shuttle valve. 1-2 Shift Valve The 1-2 SS valve is OFF, the signal A fluid exhausts through the solenoid and the spring force holds the valve
2004 Hummer H2 2004 TRANSMISSION/TRANSAXLE Automatic Transmission - Overhaul - 4L60-E/4L65-E
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