Normal Low

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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 is supplied to the output port.

Fig 1: Identifying Solenoid Valve Operation (Normal Low)

Courtesy of MAZDA MOTORS CORP.