i have an 09 tahoe lt 5.3L and threw codes p0030 and p0135. i changed the b1s1 sensor with a denso sensor and still throwing the codes. the fuses are good. with the KOEO, i tried a test light between pink wire and blk/wht wire and it didnt light up, there is power to the pink wire and the blk/wht wire is showing 25.3 ohms on the 200 scale of the meter. when i disconnect the connector at the ecm and check the ohm reading from blk/wht wire to pin 12 it is 0 ohms. does this mean the ecm is the problem?