September 30, 2005
In Saturn TAAT units, the pressure regulator valve is electronically controlled and oscillates continuously in the casting bore, causing excessive wear. This wear will prevent proper stroking of the valve and line pressure will go higher or lower than commanded. The hydraulic integrity of the circuit can be re-established by using the highly wear-resistant Sonnax pressure regulator sleeve 95200-05K with the OE pressure regulator valve. A OE-sized Sonnax pressure regulator valve 95200-06 is available when the casting has been remanufactured or the original valve is damaged.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.