After lots of searching I found a list of OBD1 ABS codes, what I found is code 25 is L front speed sensor or circuit open. 26 is missing L front speed signal. 37 is erratic rear speed signal. these codes are supposedly for a 1995 chevy truck. Do these make sense DmaxMaverick? I got the codes by jumping the second from left lower terminal to the upper right terminal on the test port.