Engine Won't start

The first thing i would check is that the battery is good and charged the battery cable's are clean and tight.Make sure all the fuse's are good in the under hood fuse box especially the ecm one also check all the fuse's in the inside fuse box..

https://www.2carpros.com/articles/car-cranks-but-wont-start

When you first turn the key to the run position go to the inside fuse box and see if the fuel pump relay click's on then off.

You said the scan tool doesn't talk to the computer we need to start there with all that you describe. No voltage to fuel pump no spark. Yes you would check the pcm fuse and make sure you have power to both sides of it with the key in the run position. If your scan tool doesn't have batteries in it will the scan tool power up off the car?

Alright here's the difference if your car had a manual transmission you would have a ecm engine control module. Since you have a automatic transmission you have a pcm power train control module when ever you combine the engine computer and the transmission computer together like they did on your car then it's a pcm when they have the engine computer by itself it's a ecm. Also when they have the transmission computer by itself for a automatic it's called a tcm transmission control module. Let me know if the your buddies scanner powers up.

That just will test if your dlc has power and ground to power up the scan tool. On your car it has to go thru your a few computer's to get to your pcm.I emailed you the trouble tree and wire diagrams so you can see what's going on. Just so you know the first thing the trouble tree asks if you can talk to the bcm/body control module your buddies scanner can't talk to bcm. So the only thing your buddies scanner can read code's from and see data is the tcm and pcm. So you will have to wing it.

Also make sure all fuse's are good inside and out check and make sure the bcm fuse has power to both side's of it.

Here is a guide to help you check the fuses.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (Below)

Please run some tests and get back to us.

Cheers

Alright the problem with you not being able to talk to the pcm is that to talk to the pcm you have to go thru the bcm. If there is a problem with the bcm then it can cut off talking to the pcm. If you had a scanner that could talk to the bcm then you could start by seeing if you could talk to the bcm and go from there. Also see what code's the bcm might have that could help you find the problem. But scanner that can read the bcm are real expensive.I emailed you a wire diagram of the path from where you plug the scanner in to it going thru the bcm thru the abs if you have it then to your pcm it's the purple wire you would have to check for a complete circuit from where you plug the scanner in to the pcm under the hood. The bcm is under the under the dash top. Disarm the air bag's first then take the dash top off there's 2 bolt's above the passenger air bag remove those then it's just clip's along the edge of the dash holding it in. Be careful of the vin plate getting hooked on the dash top. Then you can follow that purple wire. Also with the key on make sure that the bcm has power and ground going to it I emailed you a wire diagram for it also.

That code is for the high blow relay I emailed you the trouble tree for it. If you followed the trouble I sent you to trace down why you cant talk to the pcm and everything check's out and you checked all the power's and ground's to the pcm?That you had all the wire's that were power and ground going to the pcm had power and ground going to them then I would be looking at possibly a bad pcm. That ground strap behind the radio should go to the radio. There should be a tab on the radio to hook it too.

Glad to hear you can talk to the pcm now.It sound's like you just need to learn the pass lock since you changed the pcm you will have to do that.I posted how to do that do that procedure 3 time's in a row and on the fourth time you crank it it should start.Let me know how it goes.

Does the security light stay on solid or flash when it's not starting. When you relearned the pass lock did the light go out between each cycle of the key?There is no cam sensor the crank sensor even if it wasn't learned it will still start. What yr and model car did you get the pcm from?Do you have spark and injector pulse and fuel pressure if so what is your fuel pressure?