October 16, 2014
Listed Aisin AW 6-speed units utilize a main relay and shuttle valve combination as a switch for 4th, 5th and 6th gear. As this bore wears vital control pressure escapes the circuit. This leads to valve sticking which results in loss of 4th, 5th and 6th Gear operation as well as possible gear ratio and solenoid codes. Reconditioning the bore and installing Sonnax oversized main relay valve kit 15741-70K eliminates these issues and restores normal shift operation.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.