Trying to work out a P0203 code

[UncleTone]

So I recently got a P0203, P0300 and P0303 codes pop up a few days ago. I started with the easy stuff, plugs, coil pack and injector. All changed and now the code is just a P0203 and sometimes the 300. I tested all the injector connectors and got a reading on the 3 cylinder at .688 volts, on all the other cylinders I got .200 volts. Now I’m not to electrically inclined side I don’t know if the .4 difference is big but it is a difference, that I know. I have a new PCM in the truck now so I know it’s not that. I just want to make sure my last resort is to take apart the wire harness and trace the #3 cylinder back to the PCM for any breaks, tears or rips. Does anyone else have any suggestions??

 

[UncleTone]

Ok, so no dice here. Anyone know where I can buy just the injector wire harness??

 

[tantore]

uncle tom you may have to buy the wire harness for all the injectors on that side i do not know if you can buy a single injector wire you can try painless costume wire co they may be able to help good luck

 

[UncleTone]

Is it possible to just swap out the ignition harness for must the entire engine harness be replaced??