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2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue


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LotusX97
New User

May 29, 2021, 12:10 PM

Post #1 of 6 (967 views)
2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue Sign In

I have a 2003 5.3l V8 1500HD. 247k something miles on it. Its been 3 years since its ran, and so far i'm 110% stumped. I have tested, and tried just about every trick in the book with attempting to fix my issue, and found+fixed some other issues a long the way, but nothing to make the truck Fire.

Heres a list of things checked and are confirmed working with the truck

.. All coilpacks are checked, have ground and spark.
.. Ground has been established between crank fuses and starter relays
.. Ignition Switch replaced, brand new and confirmed working

Heres the problem that i have, that i think might be the cause of why my truck isn't firing. But i am stumped on it, and need some help if someone might knows what these wires are, what they do and how important they are to the security system, and whether or not they could be preventing the truck from firing.

I have the Anti-Theft Deterrent light on my cluster panel. Something has triggered the security system, and im pretty sure what, but that doesn't matter. These wires at one point where cut, and shorted, but as you can see i have spliced them back together correctly.




I'v also attempted the security relearn procedure and it hasn't worked either. But heres an interesting tidbit i found.

When i touch my test light to the white wire to check ground, i get a weak ground from it, and when i touch it the security light goes off for 1 second then comes back on. It will only do this, after turning off and on the key and will only do it once. I still get Crank no start as i have tested it obviously.

If anyone can tell me what these wires are, what they do, and if this would be a cause for preventing fire please let me know. Also would appreciate some type of Diagram of this wiring system in the ignition area if one exists....


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 29, 2021, 1:06 PM

Post #2 of 6 (961 views)
Re: 2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue Sign In

Wiring diagrams are made by circuits, not locations on the car. I don't believe those wires are part of the security system. They could be the shift lock solenoid or a key in sensor.

If you have a security light activating when you try to start the car, then there is a problem with the immobilizer system. You will need a dealer level scan tool that is capable of reading the Body control module. There are no chips in the key so changing the ignition switch shouldn't require anything additional.

If it's been 3 years since it ran, you could have all kinds of issues, starting with fuel and fuel supply.

It's time for some basic "Crank, no start" testing.

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 29, 2021, 1:11 PM

Post #3 of 6 (959 views)
Re: 2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue Sign In

This may help you identify parts





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



LotusX97
New User

May 29, 2021, 7:45 PM

Post #4 of 6 (946 views)
Re: 2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue Sign In

At this point i'm positive its a security issue. There is spark in all the coil's and when i check for fuel pressure, i got a nice squirt of old unleaded paint thinner to the face...

Can you explain the Immoblizer system to me however? I have no clue of what that is.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 29, 2021, 7:52 PM

Post #5 of 6 (942 views)
Re: 2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue Sign In

VEHICLE THEFT DETERRENT (VTD) DESCRIPTION AND OPERATION

PASSLOCK(TM) SYSTEM
The theft deterrent system has been incorporated into the body control module (BCM). The theft deterrent is provided in order to prevent the vehicle operation if the correct key is not used in order to start the vehicle. The ignition key turns the lock cylinder. The cylinder rotation produces an analog voltage code in the Passlock(tm) sensor. This voltage code is received by the BCM. The BCM compares the voltage code to the previously learned voltage code. If the codes match, a class 2 message is sent from the BCM to the powertrain control module (PCM)/vehicle control module (VCM). The message enables the fuel injectors.

The design of the Passlock(tm) system is to prevent vehicle theft by disabling the engine unless the ignition lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the PASS-Key(r) system. However, the Passlock(tm) system eliminates the need for a key mounted resistor pellet. The components of the Passlock(tm) system are as follows:
- The ignition lock cylinder
- The ignition switch
- The Passlock(tm) sensor
- The Body control module (BCM)
- The security telltale
- The vehicle/powertrain control module (VCM/PCM)



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 30, 2021, 4:37 AM

Post #6 of 6 (935 views)
Re: 2003 Chevy Silverado 1500HD 5.3L Crank No Start/Security Issue Sign In

Just quote from top post ">247k something miles on it. Its been 3 years since its ran<"
YIKES!
Sorry if I missed it this got long before I checked in. 3 years is way over long enough for all oil to drain to pans, metals are totally dry.
Could there be magic out there? IDK but would be seeing if it had much or any compression VERY quickly and first thing. Just the attempts are self-destructing this thing now.
It's an opinion, not clear fact but if this was just a hunk of metal to compress, with an oil sump bet it can't. Even a "wet" test I don't even trust valves.
This long unless run or wildly stored every last oil seal on a rotating item will fail if it does run at all never mind why.
What was your intent to do with this thing? I just see an endless $$ pit no matter if you get it running or not is just for some core parts IMO and I mean no harm, it's just too long,


T







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