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Engine will not crank, anti-theft

Tiny
JCPHILLIPS21
  • MEMBER
  • 2002 FORD F-150
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
I was working on truck had it idling in the yard then all of a sudden it shut off. Now every time I put key in theft flashes rapid for minute then gives code 16. I tried both the main key and the spare key both coded to that truck doesn't work truck just turns over but no start.
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Friday, March 18th, 2022 AT 2:56 PM

13 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
This code comes up when the cluster is not working when you turn the key on does the cluster work. You could have popped a fuse which could cause this issue. Let's start with the easy stuff first. These guides can help also I have included the fuse locations:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Saturday, March 19th, 2022 AT 4:34 PM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
Yes, fuse is good, and I tried the little tricks to bypass the pats. Nothing worked.
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Saturday, March 19th, 2022 AT 6:38 PM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
This first started when something was overcharging my battery, and someone reseated the cable and I guess instead of overcharging the battery it sent all those volts to everything else. Someone said that could have damaged the computer could it?
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Saturday, March 19th, 2022 AT 6:39 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
Yep, that can do it, have you run a CAN scan on it? Here is the link:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Please run down this guide and report back.
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Saturday, March 19th, 2022 AT 6:53 PM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
Tool the computer out of its casing and there's a burn spot assuming that's the problem. Do I need the exact same computer for it to work in my truck? And what could be causing the overcharging issue? I've already replaced the voltage regulator.
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Saturday, March 19th, 2022 AT 11:43 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
As you can see from these wiring diagrams the cluster has a voltage gauge that interrupts the charging system so if the cluster is bad, it will cause charging issues. Check out the diagrams (below). Please let us know what happens.
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Monday, March 21st, 2022 AT 10:26 AM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
Thanks I'll look into that. Could this be the cause?
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Monday, March 21st, 2022 AT 2:38 PM
Tiny
KEN L
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  • 47,320 POSTS
Yep, it looks like you may have found the issue, you can fix that by soldering over the break.
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Monday, March 21st, 2022 AT 3:18 PM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
Really all I have to do is solder over where the strips are broken. To fix the overcharge issue so I need to check all of those wires in that ground for a naked wire.
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Monday, March 21st, 2022 AT 3:39 PM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
It didn't fix it still gives me theft code 16.
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Monday, March 21st, 2022 AT 6:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
Does the cluster work now? Also did you clear the codes? This guide should help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.
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Monday, March 21st, 2022 AT 6:59 PM
Tiny
JCPHILLIPS21
  • MEMBER
  • 12 POSTS
Yes, everything on the cluster works other than mileage is all dashes. No, I haven't cleared the codes, I'll try that.
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Monday, March 21st, 2022 AT 8:51 PM
Tiny
KEN L
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Okay, please let me know.
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Thursday, March 24th, 2022 AT 9:53 AM

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