Did you disconnect the MAF while the key was in the "on" position? If you did that's why your CEL is on, it needs to be cleared. If you didn't disconnect the MAF while the key was "on" then your MAF is bad. I'm pretty sure if the ECU sees a bad MAF it'll disable the traction control system as well as they're tied together. I've had this happen on a few Avalons and Camry's back when I was at Toyota.