September 30, 2005
In Aisin AW 55-50SN and 55-51SN units, the original equipment solenoid relay plunger valve sleeve is prone to wear due to the continuous oscillation of the plunger valve. Solenoid modulator pressure feeds into this sleeve, which then works to correctly position the inboard solenoid relay valve. This valve is responsible for directing lockup control fluid into the TCC signal circuit to apply the converter clutch, as well as directing B5 control fluid to the U1 shift valve to apply the 1-2 Reverse (B5) clutch. A worn sleeve will then prevent proper lockup control and B5 clutch operation, resulting in the noted symptoms. Sonnax solenoid relay valve kit 59947-05K eliminates wear and restores proper circuit control.
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Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.