MPV DX V6-2.5L DOHC (2000)
Valve Body: Description and Operation
1-2 Accumulator
1-2 ACCUMULATOR
Outline
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The 1-2 accumulator reduces shifting shock generated during 1GR - 2GR and 3GR - 4GR shifting by moderating a rapid increase in hydraulic
pressure when the 2-4 brake band is engaged.
Operation
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In 1GR, the line pressure (7) is applied to the left end of the piston, pushing it to the right side.
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When the shift solenoid A turns ON to shift to 2GR, 2-4 brake band application pressure (9) is applied to the right end of the piston by the 1-2
shift valve. This moves the piston to the left. This movement of the piston moderates a rapid increase in line pressure (9).
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When shifting from 3GR to 4GR, 2-4 brake band application pressure (9) is temporarily drained while still in 3GR, the 2-4 brake band is newly
applied, and then shifted to 4GR. As a result, line pressure (7) and 3-4 clutch pressure (19) work as a backup pressure of the piston, making the
counteractive line pressure (9) shift high. This provides optimal 2-4 brake band application timing during 3GR to 4GR shifting.
