Won't start

Hi:
This sounds like a ground problem. Have you checked all of the ground leads from the battery, body ground straps...? Also, Have you checked for power to the starter, relay...?

We are losing power somewhere here is a guide to help us find out where.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Here is a starter wiring diagram (Below) to help us see how the system works and check for power.

Let me know. If you are getting no power to any of the components, are you getting power to the accessories?

Joe

Hi:
Based on everything you have mentioed, it sounds like the security system has shut the ignition and fuel down so the car can't be stolen. Let me do a little research on this problem. I will also be contacting other techs, so don't be surprised if you get a response from others. If I had to guess, I would say the sensor in the steering column is no longer recognizing the key's sensor.

Joe

Definitely sounds like pass lock problem. When you turn key to attempt to start truck I want you to leave the key in the run position and let me know if the theft light goes out or it just flashes. It should just go out, if it continues to flash then the problem is in the ignition key or cylinder/switch. I can temporarily get you started if this is the case but it will need to be fixed. Get back to us.

I agree it does sound like the sentry system you all are on the wright track

Check these fuses they very depending on model fuse 10 and 22,25,28,29 in the fuse block under hood also fuse 47 in rear fuse block the pcm is located on intake manifold left side of engine

I have seen the ground connection on drivers side of cylinder head cause no start by not giving starter relay a ground. Check that.

Ok like tim said check your grounds

You will need to reset the security system here is a guide to help.

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

Please let us know what you find. We are interested to see what it is.

Cheers, Ken