99 f150 theft light
Thread Starter
|
New User
Joined: Jun 2013
Posts: 3
Likes: 0
99 f150 theft light
i have a 99 f150 with a 4.6 that will not start. it has sat for a while now. when i go to turn the key to turn it on it cranks and cranks and cranks but wont start. the theft light blinks like crazy and the odometer reads dashes. there is also a relay which i do believe is the pcm relay that clicks like crazy. when the relay clicks and the key is first turned to the on position the fuel pump will turn on and off as the relay clicks. we tried putting a scan tool to it to try to pull a code and the scan tool wont connect. i do believe its the pats system kicking, but i also think its related to this relay clicking like a mother, maybe a bad connection in the junction or something. but im not really sure how to try to start and find the problem. i have also tried replacing the relay that clicks and the new relay does the same thing. any help on this would be greatly appreciated.
Cargo Master
Joined: Apr 2003
Posts: 3,476
Likes: 224
From: Frequently frozen MN
welcome to FTE
I DON'T really know much about your truck, but there's a post just a few down that's very similar ( truck won't start acts like no fuel...)
His problem was the receiver for the chip in the key. Others have apparently had issues with the key and have had it reprogrammed.
Check out the thread and maybe search on 'PATS' or 'key programming' -- stuff like that.
Good Luck,
hj
I DON'T really know much about your truck, but there's a post just a few down that's very similar ( truck won't start acts like no fuel...)
His problem was the receiver for the chip in the key. Others have apparently had issues with the key and have had it reprogrammed.
Check out the thread and maybe search on 'PATS' or 'key programming' -- stuff like that.
Good Luck,
hj
Elder User
Joined: Sep 2009
Posts: 693
Likes: 1
From: Indiana
X2 ford2go!!!! The theft light is flashing because the truck is not reading the chip in the key to allow power to pump fuel. Had a f150 of this gen. At work And we would mix the keys now and then and crank it and wonder why it wouldnt start! Haha. Well if you have a spare jump to that key. But I'm 99% sure your key is not disabling the theft system. I have a 97. No chip. Wonder when they started to chip the keys?
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Nope, he does NOT have a PATS problem. He has a PCM relay power problem that needs to be fixed before anything else.
If the PCM doesn't get power to properly boot up FIRST, nothing else will work and you'll waste time chasing PATS or fuel delivery system phantoms.
If the PCM doesn't get power to properly boot up FIRST, nothing else will work and you'll waste time chasing PATS or fuel delivery system phantoms.
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
If the PCM Power Relay is clicking/chattering like you said, then either it's bad, or it has a bad power of ground connection. Might be a corroded socket, a corroded ground, a corroded fuse socket, a bad ignition switch or a few other things.
Trending Topics
Thread Starter
|
New User
Joined: Jun 2013
Posts: 3
Likes: 0
i looked on alldata today at school and its actually the fuel pump relay. but looking at the wiring diagram the fuel pump relay im pretty sure runs into a lot of things that control the pcm. since i couldn't get the code reader to work again today im going to go with your theory that the computer doesnt have enough time to boot up. i tried to program a clicker for the locks and the truck wouldnt go into programming mode. so tomorrow im going to try to take about the junction box and start from there.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Er.... have you tried...
Thread
Thread Starter
Forum
Replies
Last Post
Stroker 6.0 fan
1997 - 2006 Expedition & Navigator
22
Oct 10, 2021 09:02 AM
GonzoCSU
1999 - 2003 7.3L Power Stroke Diesel
4
Jun 16, 2017 10:25 AM