cranks but no start. no lights on dash, code reader will not connect 96 k1500

[Dirtymike35]

Engine cranks over but no power to fuel pump and no spark. No lights show up on dash and my code reader will not connect to the ecm. I've tried checking all the grounds but cant find any that are bad, replaced ignition cylinder with no luck and i even ordered a different ecm with no luck, checked all fuses they are all good. I'm stumped even after reading through the other crank but no start threads.

 

[Schurkey]

Do the fuses have power? Just because the fuse is "good" doesn't mean it's supplied with voltage.

Maybe a popped fusible link under the hood, powering the dash/interior.

The ignition lock cylinder has nothing to do with passing electricity. The ignition switch does.

 

[Dirtymike35]

yes the fuses have power going in and coming out.

 

[kennythewelder]

Watch this video that I posted last year. It shows you how to test the fuel pump relay. How to jump the fuel pump relay, and where the power comes into the relay. This will help you to determine where the issue is. Before a or after the relay.

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[Dirtymike35]

Do the fuses have power? Just because the fuse is "good" doesn't mean it's supplied with voltage.

Maybe a popped fusible link under the hood, powering the dash/interior.

The ignition lock cylinder has nothing to do with passing electricity. The ignition swi

Do the fuses have power? Just because the fuse is "good" doesn't mean it's supplied with voltage.

Maybe a popped fusible link under the hood, powering the dash/interior.

The ignition lock cylinder has nothing

Watch this video that I posted last year. It shows you how to test the fuel pump relay. How to jump the fuel pump relay, and where the power comes into the relay. This will help you to determine where the issue is. Before a or after the relay.

I have done that and the fuel pump kicks in and builds pressure. Awesome video though.

 

[east302]

The service manual will have the diagnostic procedure for determining the cause of the DLC communication error. Those can be downloaded here:

88-98 Service Manuals

Bought a 96 service manual on a cd, and uploaded it to my computer there are 2 books with a combined storage of 750MB. I took a quick gander through the pages on the forum, and haven't seen a service manual for the 96. how and where do I upload the book 1 and 2 pdf files to help out for 96'ers...

www.gmt400.com

Year 1996 is on post #84 in the link.

Attached is the wiring diagram for 1998. For that year, pin 16 (lower right) of the DLC should always be hot, powered from fuse #7. Passlock and EVO aside, it may be close to your 96 but check the manual.

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