No spark, no fuel pump, when you turn the key to the on position

Hello,

The code P0340 could be due to a bad cam sensor. However, many times it is due to faulty wiring for the cam sensor. Also, it can be due to a bad PCM. If the sensor does not fix the issue you will have to take a deep dive into diagnostics to figure out what the issue is.
I have attached the trouble shooting guide for this code below.
Follow those steps and that can help you determine the cause.

As for unplugging the ECU you should not have to program it just for unplugging it. Usually, programming is needed when a new ECU gets installed.

Please let me know of any questions.
Thank you.

https://www.2carpros.com/articles/camshaft-angle-sensor-replacement

Thanks for your reply and help. great news about the ECU not having to be re programmed. Did find something interesting this morning though, while going through the sensors with a circuit tester the plug that goes to where the fuel injection is has almost no power (see attached) compared to the camshaft position sensor it's very bright. so something could be wrong there?

Did you check this at the fuel injector harness or the injector?
You should have power with the key to the on position.
Did you say that the engine was getting fuel?

fuel injector harness with the key to the on position. When you turn the key to the on position usually you can hear the fuel being primed, I don't get that noise at all.

Right the initial priming of the pump is audible.
You can have an inoperative fuel pump due to a bad relay, wiring issue, or a bad pump.
This car got 2 relays for the pump.
They are located in the fuse box on the left side of the steering wheel, close to the knee area.
See diagram below.
Checking the relay is a good place to start.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Thanks for your time and assistance. Turns out that it's a lot more than I thought.

Sure, no problem.
So, what was the main cause of this issue?
I see head gasket and timing belt on the list.

Mobile mechanic showed me the timing belt is missing more than a few notches and no compression in 3 out of the 4 and the one that did have compression only registered 25.

Well, this engine is an 'interference engine'. Which means if the timing belt breaks or slips it will cause damage to the head. Typically, it will bend valves. It can also damage the top of the pistons.
You are having no compression could be a sign of bent valves.
Keep in mind that many times this will require an engine rebuild, depending on the damage.