3-4 Shift Valve
- The 3-4 shift valve automatically controls shifts between third gear and 4GR gear by switching shift solenoid B on/off.
- In third gear position, with shift solenoid B on, passage A line pressure is drained. This allows the 4GR clutch passage to be opened and the 4GR brake passage to be closed. With shift solenoid B off, the passage A line pressure causes the valve to shift. This allows 4GR clutch passage to be closed and the 4GR brake passage to be opened, engaging 4GR gear.
- Also in first gear position, shift solenoid B is off and the passage A line pressure is on. However, the passages to the 4GR clutch and to the 4GR brake are not shifted, because passage B line pressure does not allow the valve to shift.
Courtesy of MAZDA MOTORS CORP.