Go Back   Ford F150 Forum - Community of Ford Truck Fans > Late Model F150s > 2004 - 2008 Ford F150
Sign in using an external account
Register Forgot Password?
Register Garage Photos FAQ Members List Social Groups Calendar Search Today's Posts Mark Forums Read StoreVendor Directory

Welcome to F150 Forum!
Welcome to F150 Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
Old 08-04-2009, 05:59 PM   #1
Junior Member
 
Join Date: Aug 2009
Posts: 9
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default Truck Won't start......

I own a 2004 F150 Fx4. I turn the key but nothing turns on! The door locks work, lights turn on, even the cig lighter works. I am thinking the problem is the ignition or in the PATS security system. Do the keys/module go bad? I have checked all the normal stuff like the battery and the Alternator.

Last edited by FireMedic1; 08-05-2009 at 10:32 AM.
FireMedic1 is offline   Reply With Quote
Old 08-05-2009, 10:35 AM   #2
Junior Member
 
Join Date: Aug 2009
Posts: 9
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

UPDATE: Out of the 100+ fuses I found out it was the 20 amp Ignition Switch Fuse that is tripping. Some suggestions on why that would be happening would be great! Thanks
FireMedic1 is offline   Reply With Quote
Old 08-05-2009, 10:45 AM   #3
Moderator
5 Year Member
 
Bucko's Avatar
 
Join Date: Sep 2008
Location: Orlando, Florida and Dallas, Texas
Posts: 6,631
Mentioned: 1 Post(s)
Thanks: 2
Thanked 69 Times in 57 Posts
Feedback Score: 0 reviews
Default

I have the 2005 Ford wiring schematics manual; I can trace the 20 amp ignition fuse to see whats on that circuit...

My guess (without checking the circuit) would be the starter....perhaps it's drawing over 20 amps to spin. Again, just a guess.

The way I understand it, the key transcoder sends a "go/no go" signal to the PATS system that is located in the PCM (firewall on passenger side). The PCM then allows the coils to fire the plugs, and for the starter to engauge.

If someone does not chime in earlier, I'll check and post for you tonight.
__________________
Give an answer, they learn for the day; suggest a search, they learn for a lifetime.

2005 F150 STX Regular Cab (4.2 liter V6)
Bucko is offline   Reply With Quote
Old 08-05-2009, 11:00 AM   #4
Junior Member
 
Join Date: Aug 2009
Posts: 9
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

how would I check the starter for a short?
FireMedic1 is offline   Reply With Quote
Old 08-05-2009, 12:07 PM   #5
Senior Member
 
ford4wd08's Avatar
 
Join Date: Feb 2009
Location: Knoxville, Tennessee
Posts: 2,725
Mentioned: 0 Post(s)
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Send a message via AIM to ford4wd08
Default

if is isnt hard to get off, take the starter into autozone or orielly's they can test it for you
__________________
ford4wd08 is offline   Reply With Quote
Old 08-05-2009, 01:39 PM   #6
Moderator
5 Year Member
 
Bucko's Avatar
 
Join Date: Sep 2008
Location: Orlando, Florida and Dallas, Texas
Posts: 6,631
Mentioned: 1 Post(s)
Thanks: 2
Thanked 69 Times in 57 Posts
Feedback Score: 0 reviews
Default

I'd refrain from pulling a starter just yet.....like I said it's a guess right now until I can view the schematic and see what else is on the 20 amp ignition circuit that could be blowing the fuse. Starters will usually begin to crank slow before they die, and since the poster did not mention this, I'd not suspect it just yet....
__________________
Give an answer, they learn for the day; suggest a search, they learn for a lifetime.

2005 F150 STX Regular Cab (4.2 liter V6)
Bucko is offline   Reply With Quote
Old 08-05-2009, 01:53 PM   #7
Jan 2008 TOTM & Gdreject
 
Squirtbottle09's Avatar
 
Join Date: Sep 2007
Location: College Station, Tx
Posts: 625
Mentioned: 0 Post(s)
Thanks: 0
Thanked 2 Times in 2 Posts
Feedback Score: 0 reviews
Default

I kept tripping that fuse when I installed my cig lighter push button start. I had a exposed wire somewhere and it would blow that fuse randomly. I went through ~5 fuses before I realized what happened. Did you try replacing the fuse to see if it works? There is a trailer harness fuse that is a 30amp in there that you could use temporarrily to see if it works or not.
__________________
<ahref="http://s107.photobucket.com/albums/m310/squirtbottle09/?action=view&current=squirt.jpg"target="_blank"><i  mgsrc="http://i107.photobucket.com/albums/m310/squirtbottle09/squirt.jpg"border="0"alt="Photobucket"></a>
Squirtbottle09 is offline   Reply With Quote
Old 08-05-2009, 02:07 PM   #8
Junior Member
 
Join Date: Aug 2009
Posts: 9
Mentioned: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by Squirtbottle09 View Post
I kept tripping that fuse when I installed my cig lighter push button start. I had a exposed wire somewhere and it would blow that fuse randomly. I went through ~5 fuses before I realized what happened. Did you try replacing the fuse to see if it works? There is a trailer harness fuse that is a 30amp in there that you could use temporarrily to see if it works or not.
Last night I pulled the other 20amp fuse and put it in the Ignition switch feed spot and the instrument panel turned on but when I turned the key to the start position it blew the fuse...... At $5 a pop for this particular fuse I need to get it right the first time!
FireMedic1 is offline   Reply With Quote
Old 08-05-2009, 02:30 PM   #9
Senior Member
 
ford4wd08's Avatar
 
Join Date: Feb 2009
Location: Knoxville, Tennessee
Posts: 2,725
Mentioned: 0 Post(s)
Thanks: 0
Thanked 3 Times in 3 Posts
Feedback Score: 0 reviews
Send a message via AIM to ford4wd08
Default

Quote:
Originally Posted by Bucko View Post
I'd refrain from pulling a starter just yet.....like I said it's a guess right now until I can view the schematic and see what else is on the 20 amp ignition circuit that could be blowing the fuse. Starters will usually begin to crank slow before they die, and since the poster did not mention this, I'd not suspect it just yet....
yea thats true, you usually can tell when a starter is goin out or shortin out, if you got the book it is best to wait, but for me i can yank a starter off in no time usually so if i was in question and had no other route i would get it tested but i guess thats why we have the forum
__________________
ford4wd08 is offline   Reply With Quote
Old 08-06-2009, 04:16 PM   #10
Moderator
5 Year Member
 
Bucko's Avatar
 
Join Date: Sep 2008
Location: Orlando, Florida and Dallas, Texas
Posts: 6,631
Mentioned: 1 Post(s)
Thanks: 2
Thanked 69 Times in 57 Posts
Feedback Score: 0 reviews
Default

Sorry I'm a day late...here goes:

Two fuses to check: fuse 102 (20Amp) and fuse 101 (30Amp). Fuse 101 is for the battery to starter relay to starter motor. If that's blown, starter gets no "juice".

Fuse 102 supplies 12 volts to ignition switch; when key is in "start" position, voltage is applied to red/light brown to central junction box (fuse box) to dark brown/orange wire. Then to Digital Transmission Range switch (to verify transmission is in neutral or park; located on lower left side of automatic transmission). Voltage from this switch is then connected to Tan/Red wire to starter relay (in fuse box), then to light green/violet wire to powertrain control module (on passenger side firewall; this tells PCM to energize coils (spark)); at same time, the starter relay allows voltage off of fuse 101 to starter motor solinoid via yellow/light blue wire; solinoidd completes path of "direct" battery voltage via a red fusible link wire. Fusible link wires all are off of battery "+" terminal; one goes to starter motor, one goes to alternator, and one goes to central junction box (fuse box).

So, I'd first check fuse 101 and 102, then perhaps the digital transmission range sensor, then any and all wiring inbetween these circuits.
__________________
Give an answer, they learn for the day; suggest a search, they learn for a lifetime.

2005 F150 STX Regular Cab (4.2 liter V6)

Last edited by Bucko; 08-06-2009 at 04:22 PM.
Bucko is offline   Reply With Quote
The Following User Says Thank You to Bucko For This Useful Post:
JPaws67 (07-08-2012)
Old 08-06-2009, 04:16 PM
 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
My truck won't start! rmantica 1997 - 2003 Ford F150 7 02-14-2009 02:43 PM
Truck won't start!! smurf25 1987 - 1996 F150 30 04-28-2008 08:42 AM
Truck will not start Stone Cold 1987 - 1996 F150 2 03-05-2008 07:38 PM
My truck won't start. kate 1987 - 1996 F150 9 01-30-2008 09:41 PM
Truck will not start Chris Mapp 1987 - 1996 F150 16 04-02-2007 09:48 AM

 

The Mustang Source

All times are GMT -4. The time now is 02:30 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.5.2
Copyright 2006 - 20011 F150forum.com
This site is in no way affiliated with the Ford Motor Company.


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.