1-2 SHIFT VALVE OPERATION

BUE051721100A50

• With the shift solenoid A OFF, line pressure (12) becomes equal to line pressure (7) and pushes the valve to the left side, shifting to 1GR.

• Also, in 1 range, low reducing pressure (10) is transmitted to (11) in 1GR, engaging the low and reverse brake.

• When vehicle speed becomes high, the PCM turns ON the shift solenoid A and line pressure (12) is drained from the shift solenoid A. Consequently, spring force and line pressure (7) working on the left end of the valve push the valve to the right, shifting to 2GR. Even when line pressure (12) is drained, line pressure (7) does not change due to there being an orifice. In 2GR, line pressure (1) is transmitted to (9), engaging the 2-4 brake band with a slow pressure increase by the 1-2 accumulator operation.

• Also in 2GR, line pressure (11) is drained, releasing the low and reverse brake.

Note
• If the R position is selected when vehicle is driven at high speed, the low and reverse brake pressure is drained from the 1-2 shift valve to prevent transaxle damage.

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1
1GR position
2
To low and reverse brake
3
To cutback valve
4
3-2 timing valve
5
From pressure regulator valve
6
From manual valve
7
From low reducing valve or manual valve
8
Shift solenoid A: OFF
9
2GR position
10
To 2-4 brake band
11
Shift solenoid A: ON