Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford V6 > 3.8 & 4.2L V6
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community 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 fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 07-03-2007, 10:08 AM
mrjaffe mrjaffe is offline
New User
 
Join Date: Jul 2007
Posts: 5
mrjaffe is starting off with a positive reputation.
'01 F150 4.2L blowing fuse 23, multiple codes

Great site! Lots of useful information. Hoping someone can bail me out.

My '01 F150 4.2L auto started with check engine light 6 months ago. Each time I checked the code it showed "Lean Mixture Left Bank." I cleared the codes and weeks later it would re-appear.

A week ago while driving down the road the truck suddenly dropped to 2nd gear and the A/C quit cooling. I was able to drive but only in 2nd gear. The transmission appeared to be in limp mode. I checked for codes and got a long list of seemingly unrelated codes. I checked fuses under the hood and found fuse #23 blown. It's labeled "HEGO and Transmission." I replaced the fuse and everything worked again for a few minutes but then the fuse blew again.

Thinking my O2 sensors were bad I replaced all four and again everything seemed to work. I drove the truck for 60 miles or so without a problem and then suddenly fuse #23 blew again.

I bought the auto store repair book in hopes of getting a decent wiring diagram I could track the circuit with. Unfortunately the diagram is vague.

I found a post by DaddyZ of a very similar situation but there was no final resolution so I'm starting a new one.

Thanks in advance for any all help!
Reply With Quote
  #2  
Old 07-04-2007, 07:24 AM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,160
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
See my posts in that thread, http://www.ford-trucks.com/forums/59...ral-codes.html for details on what is involved.

While the OP in that one never replied back or followed up, all the information provided there is relevant.

Too bad you spent all that money on new sensors you didn't need...

Steve

Check your harnesses.
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: www.motorcraftservice.com
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” - Mark Twain
Reply With Quote
  #3  
Old 07-04-2007, 09:57 AM
mrjaffe mrjaffe is offline
New User
 
Join Date: Jul 2007
Posts: 5
mrjaffe is starting off with a positive reputation.
Thanks Steve! I did look at that post but as you said didn't see the final outcome.

Is your guess that it's a damaged harness more likely than a failed component on that circuit?

You mentioned also in that post that you might have a wiring diagram. Would you be willing to share it?

Thanks again for the help!

Mike
Reply With Quote
  #4  
Old 07-08-2007, 06:33 AM
projectSHO89 projectSHO89 is offline
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 9,160
projectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud ofprojectSHO89 has much to be proud of
2001 4.2 Engine Schematic

Click on the link to download a pdf of the schematic.

F23 is shown on cell 23-1. Its loads are detailed on pages 23-4, 23-5, & 23-8.

If you need additional documentation, let me know. If you want your own, it's amazing what happens if you google "ford service cds" :wink:

While any of the load components might be intermittently shorting to ground, I've yet to see one of these faults that wasn't due to a harness intermittently shorting to chassis.

Steve
__________________
2001 F250 SD V10 4x4
HVAC FAQs: http://www.ford-trucks.com/forums/75...xpedition.html
Owner's manuals: www.motorcraftservice.com
It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt.” - Mark Twain

Last edited by projectSHO89; 07-08-2007 at 06:45 AM.
Reply With Quote
  #5  
Old 07-09-2007, 08:57 AM
mrjaffe mrjaffe is offline
New User
 
Join Date: Jul 2007
Posts: 5
mrjaffe is starting off with a positive reputation.
Thanks Steve! I haven't found the problem yet but did find one pair of worn wires to some sensor on the air intake assembly very near the A/C compressor. The harness had fallen onto the compressor pully and had a spot worn all the way through. I experimented with shorting the damaged wires to ground but the fuse didn't blow. I repaired them and went on to check leads to the O2 sensors Nothing looked out of the ordinary. Interestingly everything seems to work fine until I put the truck in gear and within a minute or so the fuse blows. I'm going to try and trace the wire by color code and sensor looking for worn harness.

Thanks again for the assistance!

Mike
Reply With Quote
  #6  
Old 04-21-2014, 02:55 PM
tailspnr tailspnr is offline
New User
 
Join Date: Apr 2014
Posts: 6
tailspnr is starting off with a positive reputation.
Anyone ever find their problem and care to share exactly where this illustrious short came from?
Reply With Quote
  #7  
Old 04-22-2014, 11:33 AM
tailspnr tailspnr is offline
New User
 
Join Date: Apr 2014
Posts: 6
tailspnr is starting off with a positive reputation.
Okay guys, so I decided that somebody should come back to this thread and show their findings after actually correcting the issue. Sorry my pics are what they are. It's tight quarters and your gonna have to look hard and compare it to your truck.

On my truck I was able to replace the fuse and sometimes it would last a few days before blowing, but by the time I decided it had to be fixed I could blow a new fuse just by turning the key to the "run" position.

Here's the deal, passenger side of the truck on the firewall there is a bracket that 2 harness connectors mount to. Follow both of those harnesses down to where they go behind the head of the passenger side of the engine. On my truck one of the harnesses was touching the hot side of the AC line that runs from the back to the compressor. Once I removed the bracket mounting the harnesses from the firewall and the battery I was able to see where the chaffing had occurred.

If your curious as to whether you have a short south of the connectors on the wiring harness, use a 10mm to undo the connector and with it unplugged see if your truck will NOT blow a fuse. If your don't blow a fuse with one of those harnesses disconnected you know your short is on that harness south of the connector.

I really wanted to inspect all of the wires to make sure none were shorting on each other but due to the tight space I elected to wrap the entire bundle and secure it with a zip up and out of the way after I tested to see that I didn't blow any fuses just by lifting it up off the AC line. The harness is very close to the transmission dip stick tube which I noted in the images for reference.

If I had the time and energy I would have removed the passenger front wheel, plastic fender well and I could have had better access to inspect the individual wires.

But anyway, I hope these help some of you others that stumble across this thread/issue.



Reply With Quote
Old 04-22-2014, 11:33 AM
 
 
 
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Ford V6 > 3.8 & 4.2L V6

Tags
1999, 2001, 23, 24, 42l, blown, blows, engine, f150, ford, fuse, hego, lean, schematic, sensor

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
E4OD shifts hard -fixed- Prototypemech Pre-Power Stroke Diesel (7.3L IDI & 6.9L) 5 12-24-2013 10:05 PM
96 Ranger problems... Transient Ranger & B-Series 9 12-02-2012 10:51 PM
Need Help. Lot's of codes for TCC, O2 sensor heater circuits, evap solenoids terrysumner Super Duty & Heavy Duty 3 01-19-2011 09:21 AM
OD light blinking!!!! 02 F250 7.3 Auto Tranz. CASHER0010 Super Duty & Heavy Duty 12 09-15-2010 09:46 PM
2003 Supercrew autolock, autolamp blowing fuses Airconditionedgypsy 1997 - 2003 F150 5 10-26-2006 04:03 PM



All times are GMT -5. The time now is 06:59 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup