Int. air temp sensor is integral to MAF sensor. Monitor IAT PID with MAF conn. open, should be >4.2V or <-40 degrees. Jumper IAT input, at MAF term.6 Gry. wire to signal return term 1 Gy/Red and PID should now be <.2V and/or >248 degrees. If these ck. out then... Login to read more.