Code P0172, PCM, injectors wiring diagram needed

Hello, here's a diagram of the injector circuits and where they go into the ECM. There's a few things that can cause 1 bank to go rich, do you have access to a scan tool with live data readings? A faulty upstream 02 sensor can cause 1 bank to go rich if that bank 02 is giving faulty readings. And injector issue on that bank, which is where it looks like you're headed. But I would do an injector balance test to see if they all have the same flow rate. It's easy test. Make sure your wire colors match the ones on the diagram. Its from a 3.3 flex fuel, but that's all they had for the 3.3l.

You can do an injector balance test by hooking up a fuel pressure gauge and pulsing each injector a certain amount of times (each the same). And monitoring the fuel pressure drop for each injector. There's a cheap $30.00 tool you can get to pulse them exactly the same amount each time. If you would like a link to the tool, I can get that for you. Works great.