Protege ES L4-2.0L DOHC (2001)
Shift Solenoid: Description and Operation
Shift Solenoid A, B and C (Duty-Cycle Type) Description
SHIFT SOLENOID A, B AND C (DUTY-CYCLE TYPE) DESCRIPTION
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The clutch pressure direct control, which supplies the clutch pressure directly to each clutch and/or brake, is adopted.
The following three-way duty-cycle type solenoids replace the conventional two-way duty solenoids, to improve response.
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Shift solenoid A
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Shift solenoid B
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Shift solenoid C
Function
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The duty-cycle type shift solenoid adjusts the amount of output oil pressure according to the signal from the PCM, and controls the pressure of
each clutch.
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The duty-cycle type shift solenoid, which switches ON/OFF at 50Hz (20ms cycle) controls the output oil pressure, by changing the ON time ratio a
cycle (0 - 100%), the solenoid adjusts the time ratio of the OPEN (supply) and CLOSE (drain) cycle, and maintains the designated clutch pressure.
As a result, the clutch pressure rises when the duty ratio (50Hz ON time ratio) is reduced, and falls when the duty ratio is raised.
Structure and Operation
OPEN : When the solenoid is de-energized, the supply port (line pressure) in the solenoid opens and is engaged with the output port (clutch
pressure). As a result, hydraulic pressure is supplied to the hydraulic passage for the clutch pressure.
CLOSE : When the solenoid is energized, the supply port (line pressure) in the solenoid closes and the output port (clutch pressure) and the drain
port are engaged to drain the clutch pressure.
