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AUTOMATIC TRANSMISSION 5A-51 POWER FLOW - DRIVE 1 In Drive 1, transmission drive is via the input shaft to the forward clutch cylinder. The elements of the transmission l The C2 clutch is engaged to drive the forward sun gear. l The forward sun gear drives the short pinion anti-clockwise. l The short pinion drives the long pinion clockwise. l The 1-2 OWC prevents the planetary gear carrier from rotating under reaction force and the long pinion rotates on its axis driving the internal ring gear and output shaft in a clockwise or forward direction. l There is no engine braking on overrun. Control To maintain this arrangement in the steady state solenoids and valves are activated as follows: l Solenoids S1 and S2 are switched On. l The 1-2, 2-3, and 3-4 shift valves are held in their first gear positions by line 500 pressure. l Drive (line pressure) oil from the manual valve engages the C2 clutch. Refer to figure 5.4 and table 5.5 Table 5.5 - Engaged Elements - Drive 1 Gear State Drive 1 C1 - C2 X C3 - C4 - B1 - B2 - 1-2 OWC X 3-4 OWC X LU CLUTCH - ELEMENTS ENGAGED |