2000 LS2 No fuel, no scanner communication after timing belt

[driver8]

So I have been searching on this forum for a few days with no avail. I was driving the car home one day and it died as I was getting off the highway, turns out the timing belt had broken. A month and a new set of cylinder heads later, I get the car back together but it won't start. It cranks, but there is no fuel pressure. I plugged in my OBD II reader and it gives a "no communication" error. The only lights that stay on the dash are check engine lights. I am so confused by this whole ordeal. I have read it could be the ECM, BCM, grounding issue but idk. It is a 2000 LS2 3.0l.

[fdryer]

What exactly do you mean "no fuel pressure"? If you sprayed starting fluid into the throttle body while starting, does the engine run or not? Let's not jump to any conclusions until several troubleshooting steps are performed. EFI systems are complicated but not with an overall perspective that engines still operate on the basic premise of needing air, fuel and spark. Presuming this engine can breathe (air) leaves fuel and spark testing. Are all fuses in good condition?

[driver8]

Originally Posted by fdryer

What exactly do you mean "no fuel pressure"? If you sprayed starting fluid into the throttle body while starting, does the engine run or not? Let's not jump to any conclusions until several troubleshooting steps are performed. EFI systems are complicated but not with an overall perspective that engines still operate on the basic premise of needing air, fuel and spark. Presuming this engine can breathe (air) leaves fuel and spark testing. Are all fuses in good condition?

Thanks for the quick response fdryer, but I solved the issue. My symptoms were I was getting no fuel pressure, no fuel gauge reading, no tachometer, no OBD II port power, but the vehicle would crank just fine. It would fire with starting fluid in the intake though. I checked ALL of the fuses, and replaced all of the relays. No luck.

After tinkering with it for a while I realized I skipped installation of the cylinder bank 1 GROUNDING BRACKET(the piece that holds part of the intake to the cylinder head) so I wasn't getting any ground. I decided to install the bracket. After the bracket was installed the car grounded out, but it only would last for a few seconds at a time.

After some more tinkering I checked the fuses again, alas ENG CNTL3 fuse (10amp) had fried as soon as I reconnected the battery. After replacing the fuse the car STARTED RIGHT UP, and I am now breaking in the new heads.

Long story short, the computer on top of the intake closest to the driver(has 2 big plugs on top) MUST BE GROUNDED properly

[driver8]

If I could put SOLVED in the title, that would be nice as well

[fdryer]

Well done as you are the second member to inadvertently leave the ecm loosely mounted. This occurred several years ago to another member. After some maintenance was performed, he loosely remounted or found his ecm with only one mounting screw barely holding it in place. When it was mentioned ecm's need to be mounted to the engine securely, he found replacement screws. The engine started up.