MPV LX V6-2.5L DOHC (2000)
BYPASS VALVE
Outline
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The bypass valve controls 3-4 clutch application timing and shifting shock during 2GR - 3GR shifting.
Operation
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Spring force and modifier pressure (21) constantly push the valve to the right side, thus transmitting line pressure (13) to 3-4 clutch pressure (18).
Then 3-4 clutch pressure (18) works on the right end of the valve, and moves the valve to the left side.
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As 3 - clutch pressure (18) increases, the valve moves to the left, in spite of spring force and modifier pressure (21) pushing the valve to the right.
Therefore, during 2GR - 3GR shifting, line pressure (13) is transmitted to the 3-4 clutch application pressure through the bypass valve, then
quickening 3-4 clutch engagement (left side figure).
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Beyond a certain level, the valve closes the path for line pressure (13); the line pressure goes through the orifice check valve, causing a slow
increase in 3-4 clutch application pressure (right side figure).
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The modifier pressure (21) applied to the left end of the valve assures that 3-4 clutch application timing matches throttle valve opening angle.
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This process controls 3-4 clutch application timing and shifting shock.
Cutback Valve
CUTBACK VALVE
Outline
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The cutback valves control the modifier pressure applied to the pressure regulator valve.