Crank no start, no spark after the battery drained?

PISTOL202

MEMBER
2000 CHEVROLET CITY EXPRESS
5.0L
V8
AUTOMATIC
200,000 MILES

It was running fine then ran the battery down and the next morning, no start. Tried starting fluid, nope, fuses nope. New distributor and plugs, new crank sensor.

Monday, August 1st, 2022 AT 1:40 PM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
46,402 POSTS

Is the security light flashing when you try to crank the engine over? If so, this is the problem because the computer will cut the ignition when in security mode. This guide can help us reset the system:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Also, this guide has some good information as well:

https://www.2carpros.com/articles/car-not-running-advanced

You can try a hard reboot which is done by removing the negative side of the battery, with the cable loose from the negative side of the battery, hold it to the positive terminal for 1 minute this will discharge the memory capacitors in the BCM and PCM allowing the system to reboot.

Please run down these guides and report back.

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Tuesday, August 2nd, 2022 AT 9:11 AM

PISTOL202

MEMBER
2 POSTS

It’s not security and did the hard reboot too. I’m thinking ground fault on ecm or bad ecm. Soon as I get a helper I’ll check if crank sensor is sending signal but it has power and ground. No signal at Icm or coil

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Saturday, August 6th, 2022 AT 6:52 PM

KEN L

MASTER CERTIFIED MECHANIC
46,402 POSTS

So, the engine has no spark, correct? Can you hear the fuel pump come on in the tank when you turn the key on? Here is the engine/PCM wiring diagrams so you can check the grounds and see how the system works:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find.

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