No pulse to #3 code p0203

[XLexusTech]

Ohm out the wire itself and also make sure it doesn't have voltage or a ground with both ends unplugged. If it does you'll need to find the short to voltage or ground or the break if it's open. You can also check the wire coming directly out of the ecm with a backprobe to see if it is pulsing there. If you have 12v at the injectors and the ground wire is good but there's no pulse it's likely an injector driver in the ecm if that's the only code you have. Some ecms will disable the injector if the coil is throwing a code or if it shows a misfire code, mostly to protect the catalyst but I'm not sure if that's disabled on your setup or not.

Thank you Tim, so update: OHM test was good. Back probe was good with a test light saw flicker at pin # 38 of the ECU. Then retested with node light and it started working. But the header pipe was still cool ... pulled the plug, found a crack in the porcelain. Changed the spark plug.. boom nice color on the Exhaust Pipe.
Then #8 started same problem no light at injector... I figured messing with the connector may have disturbed connections.



cleaned reseated then 8 lites up the noide light. Still doesn't feel like its running on all 8 though.

P0141 and p0171 and p0174 .... One o2 is pinned at .45 the other cycles between .90 and .04