I have a 2000 Nissan xterra two wheel drive four cylinder. My abs light is on. I tried auto parts stores in Tucson but none of the have an obd reader that covers abs problems. I tried the method mentioned in the Chilton manual that discussed grounding a pin in the obd reader and counting the light flashes of the abs light but that did not work. Any suggestions? Local mechanics want around $130 dollars to tell me the codes.