#
SOLENOID VALVE DESCRIPTION [JA5A-EL]

BME051719200T11

## Function

Function chart

Solenoid | Type | Characteristics | Function
--- | --- | --- | ---
Pressure control solenoid | Repeats ON and OFF at 50 Hz (20 ms cycle); duty cycle type (three-way type) | Normal high | Controls pressure regulator valve, regulates line pressure
Torque converter clutch (TCC) solenoid valve | Normal low | Controls TCC engagement and disengagement
2-4 brake solenoid valve | Normal high | Control 2-4 brake engagement and disengagement
High clutch solenoid valve | Control high clutch engagement and disengagement
Shift solenoid A | ON/OFF (three-way type) | Normal low | Control shift valve A
Shift solenoid B | Control shift valve B
Shift solenoid C | Control shift valve C
Reduction timing solenoid valve | ON/OFF (two-way type) | Control reduction reducing valve
Neutral shift solenoid | Control neutral shift valve and reverse inhibitor valve

## Construction/Operation

### Duty type

Normal high

  • De-energized (OFF) or duty 0%
  - Because the output port (solenoid pressure) and supply port (pilot pressure) connect in the solenoid, the solenoid pressure supplied to the output port.
  • Energized (ON) or duty 100%
  - Because the output port (solenoid pressure) and the drain port connect, solenoid pressure is drained.

Normal low

  • De-energized (OFF) or duty 0%
  - Because the output port (solenoid pressure) and the drain port connect in the solenoid, the solenoid pressure is drained.
  • Energized (ON) or duty 100%
  - Because the output port (solenoid pressure) and the supply port (pilot pressure) connect in the solenoid, the solenoid pressure supplied to the output port.

### ON/OFF type (two-way)

Normal low

  • De-energized (OFF)
  - The TCM does not apply an electric current to the solenoid valves. The rod moves upward by hydraulic pressure and the drain port opens.
  • Energized (ON)
  - The TCM applies an electric current to the solenoid valves. This excites the coil and forces the rod to move downward to retain hydraulic pressure.