My truck is a 1999 tocoma regular cab 2.4 engine ..had a code PO 135.. replaced upstream sensor with Denso...code came back..checked at connector..had 12v on plus side and no grd from computor key on.The wire from grd at o2 sensor is purple with black stripe...think at ECU a wire that color is at E8 # 2 wire but no continuity from ecu to sensor both unpluged..am i right for wire from ecu or did i miss it..looking at info for differant models this wire should be a straight shot.can anybody verify the ecu pin # for heated grd wire for O2 sensor..dealing with #1 and 2 wires at sensor