I recently brought a g35 coupe as a project car.
It starts up with out a problem but was getting no throttle response when in gear. It barely revs in park or neutral. I’ve change the throttle body and APP. I’ve done the pedal Dance but the CEL won’t start flashing if anyone can help please message me

codes are p2127 p2138 p0222 p2135 p0123

 

If you replaced the APP but still can't pedal dance then you need to troubleshoot the wires back to the ECM.

Follow the steps in the FSM. Look up the DTC for the APP in section EC - Engine Controls, that will get you on the right path.

https://www.nicoclub.com/infiniti-service-manuals

 

Here’s an update on what i found


Pedal fully pressed

Pedal fully released

 

It's pretty easy to bend pins on the electrical harnesses, I would disconnect the battery, unplug the APP and inspect the harnesses for any damage or bent pins. (EDIT: leave the TP, it appears to be working, get the APP working first).

If everything looks good the next step is to ring those wires out back to the ECM to make sure it's not just a broken wire.

You can bench test the APP switch itself with a AA batteries, get a generic 3x AA battery holder to supply power through the app switch, run it in series through a digital multimeter so you can watch the voltage rise/fall on both halves of the APP switch to verify the switch is actually working. That's what I typically do to test Nissan 5v systems. Here's the type of holder I use, generic holder with wire leads. 3x AA batteries gives you 4.5v