FORD Central Junction Box (CJB) aka BCM repair / relay replacement OBD Code P0231 repair 2002 - 2007
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- Опубликовано: 26 май 2023
- Step by step instructions on proper disassembly, component replacement and re-assembly of the 2002 through 2007 FORD Central Junction Box (CJB) aka Body Control Module (BCM) concentrating on the "non-servicable" fuel pump relay inside the fuse block assy.
This is the relay I purchased for this repair: amzn.to/3N2dHg5
If you feel like buying me a cold one... paypal.me/speedylink?country.... 
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This video should be used as instructional for a soldering class. 👍🏼
Excellent video and thanks for sharing your work. This is my first experience with a non-serviceable relay of this sort and you've answered many of my questions on how to approach it. To me, it seems the worst part is putting the fuses back in place...lol
Great information on how to check this fuse panel. When I opened my 2002 Ford Excursion fuse panel (easy enough thanks to you), the relay appeared to be in pristine condition. So I am moving on to testing the fuel pump. I can rebuild anything, but electrical stuff is not my forte. THANKS FOR THE VIDEO! I know it will provide great insight to many.
Glad it helped some Dale. Please share my channel with others to help me grow. Cheers
Great video! Thank you for your time to produce it.
Nice! I have a 2005 E350 that had the overhead compass/thermometer go intermittent. The first thing I found after disassembly was that the lead free solder had cracked around one of the solder pins. On that circuit there wasn't enough current flow to heat stuff up, just work sometimes when you hit a bump on the road. I re-flowed the pins with 60/40 and all's good. You probably had a similar lead free solder issue that started it all. Thanks for taking the time to record this
Thank you so much for taking your time to share this with us. Not only did I learn where the relay was but the soldering lesson was invaluable.
You are very welcome. I am glad it helped you out! Please consider subcribing to my channel and share with friends...
Hey Mike, I know it was an old vid, but what are you doing to the yellow Maverick?? It is in very good shape....
I haven't had a chance to do anything with it due to my work schedule and lack of "help". Its in the shed in very good shape (no rust, etc) but no motor/trans or interior. I have all the parts, just need time & help to get it finished@@digitaloverdrivesystems
Where are you?
an easy touch and mega patience
Nice work. You solder like an old Navy 2M technician. LOL Best Wishes & Blessings. Keith Noneya
This is a GREAT VIDEO. It was VERY HARD TO FIND though... Please update the title to indicate the general application. e.g.: 2004 (late 2002 through 2007) Central Junction Box (CJB) repair and relay replacement. This repair is for a LOT more than just the fuel pump relay.
Again, GREAT vid. I wish I found it 3 months ago.
OK thanks, good input
Awesome video thank you
What a great job ya did, and I can see why the BCM cost's so much but with a little patients and a bit of time - saved a modual from the scrap heap and kept it out of the landfill. Job Well DONE!
Thanks for the information. This sounds like my problem. There’s so much misinformation on the Internet about the fuel pump relay. Thanks.
Before even removing that junction box from the truck you can diagnose whether its the pump or that relay just by removing the 4 pin plug on the outside of the junction box. There is a green/yellow wire, if you inject 12 volts to the wire (not the board pin) this goes directly to the pump, if you hear the pump its good. If you take a voltmeter to the board pin that the green/yellow wire connects to (i believe the lower left corner of the 4 pins) you should see 12volts there when you turn the key. If it wont read 12 volts with no load (cause you disconnected the pump wire) then you know that relay is bad without even taking it all apart... but you should really put a load on it to make sure its bad before taking it all apart. Im about to do this repair myself on a 2003 F150. the soldering part is the least of my worries as i work in electronics.
Hey man I read your post very closely, and I'm about to do this as well can I use a charged car battery to "create" the load also do you have a video on the subject?
@@charlesdupuis1327 you can, but you shouldn't. It's better if you have a prove that can feed that voltage thru it.
Just finished replacing my neighbor's fuel pump relay on his 2006 Ford F350 from instructions in your video. Many thanks for posting this and leaving it up as it has been awhile since you first put it on RUclips.
Could you share what resource you used (or recommend) in locating the relay and how you identified it? There were a few other relays on the board I would have liked to identify.
All in all, you saved us a lot of grief, and your well thought out video was easy to understand.
Thank you!!!
Glad I could help. The relays on my board were all the same. The link is in the video description but here it is again amzn.to/3N2dHg5 It is a common OMRON 12v relay. Cheers!
It helps me a lot, thanks for the video
Good stuff
Your amazing thank you so much 😊
I have a 2004 ford expedition 5.4L same problem the engine stall set for a while than stated back up than stall again for the last time rented a 3100 Lat from auto zone the code is the same P0231 The fuse block on this ford located passenger side below the Dash on the side panel. I'm sure same year same code same problem I think I'm going to tackle this it's not rocket science thanks for the video. And also, I have the tools.
Where have you been this whole year sir! I've been looking for a tutorial like this for those modules 🎉
Holly-Molly! That's a lot of work. I'm just gonna pay 2 get rebuilt unit
That is probably what's wrong with my truck thanks
You got yourselves a new subscriber!
Other than planned obsolescence, what would be wrong with a replaceable fuel pump relay?!
Hope he answers you on that quest.
There are quite a few replaceable relays in the system already. My only guess would be that Engineering underestimated the thermal portion of their design here. The coil in the relay obviously uses energy, and it dissipates it in the form of heat. Being enclosed in that box without ventilation, the heat continues to build until the coil windings eventually fail (the tiny coil wire melts somewhere and opens the circuit like a fuse would). That is only my guess though, as the contacts of the relay didn't fail, the coil did...... Cheers!
BTW, I got 258,000 miles out of the little bastard. I just sucks because you can be stranded by it at anytime :)
A set of bicycle tire changing spudgers would be perfect for prying the cover! They're plastic so they don't scratch or bend aluminum bike wheels
A little too big I think, but whatever works for you... Good luck...
wunnerful
Do u have link to the relay
www.amazon.com/dp/B0C2DDS1NP?psc=1&ref=ppx_yo2ov_dt_b_product_details
When you would crank no start was the fuse panel continuously clicking whilst attempting to start?
No, not that I could hear.
does anyone here know the part number of the female relay "junction connectors", and the ones for the fuses too? I am referring to the female to female blade connectors under the black plastic fuse box cover... I need replacements.
That could be a tough one... You may have to try to find a junk box and cannibalize it... Sorry I cannot help. Cheers!
Just great video, this find and documentation is Master Mech. level. The relay you linked to says it is omron brand too but only down in the last paragraph in product description. Gotta ask, is it still working ?
Still working fine. I have no reason to think it would fail again for many thousands of miles..
What size engine inside your excursion?
5.4
Hey chief, do you have any idea what the four other mini ( non servicable ) circuit board relays are ?
Sorry but I would have to find and study a schematic to tell you that. I wouldn't worry about the others though as they do not have a history of failure.... Cheers!
The other relays DO go bad! This video is fantastic but it is titled too specifically. Other power gremlins occur which are due to the other power circuits on the CJB. In my case: the brake warn light + chime along with cruise control, blinkers, and DRL's (daytime running lights) all go haywire via another circuit on this board.
Again, this video is fantastic because it actually shows how to properly deconstruct the CJB assembly and how to correctly R&R the damage.
Please update your video title to encompass the broader range: This is for all 2002 model year F-superduty trucks build AFTER July 2001 and is applicable through the 2007 model year trucks (with ANY power or ground problems related to the CJB).
The prior setup (1999-early until the early 2002 model year) used the GEM .. which contained the logic which the later model (CJB equipped) instrument cluster took over.
@@digitaloverdrivesystems
Thanks, I took your advice on the title. I am not proficient with the making and editing this stuff though, as you can probably tell. Cheers!
@@digitaloverdrivesystems You might want add a / BCM (body control module), thats what ford specifically calls the fuse panel for these years trucks, may be called the central junction box now but not back then, cheers
@DigitalOverdrive: Will a CJB from a 2003 Expedition 4X2 (w/out factory alarm) work in a 2004 Expedition 4X4 (w/factory alarm)?
I have a new CJB from my son's totaled 2003 Expedition that I would like to swap in my 2004 Expedition, cause the fuel pump relay switch is burned up.
I will set them side by side on my work table and compare them front and back to see if they are the same.
If they look the same I will install the new CJB from the 03 Expedition on my 04 Expedition, hoping that it works.
Please reply soon.
Thanks.
Sorry but I do not know the answer to that. Maybe have the dealer look up the part for both vehicles and see if it is the same one.
@@digitaloverdrivesystems So I carefully compared both Central Junction Boxes yesterday and they are identical to each other.
All the plug-ins are exactly the same, the needle like connections are the same and both boxes are identical, there is no noticeable difference between them.
The only difference is in the Ford identification numbers, where the 2003 is: 3L7Z-14A068-AB and the 2004 is: 4L1Z-14A068-AB.
So today I will try to make the swap and hopefully it'll be successful, otherwise it'll cost me a lot more, and my 2004 Expedition has 408,775 miles.
@@cma8165Sounds like you should be good. LMK how it works out for you...
@@digitaloverdrivesystems So I swapped the CJB into my 2004 Expedition that I removed from the totaled 2003 Expedition, cause it was only used for 2 months after it was purchased new from the local Ford dealer for over $400 dollars.
The swap was a total success, thank God.
I thought about sending out the bad CJB to get it overhauled but I saved from having to do that with this swap.
Thanks for posting your video in RUclips and your replies are greatly appreciated.
Why wouldn’t they use a SSR for these? Also, what year are those pennies? Did you know the newer ones aren’t all copper?
Solid State Relays would have been better but were probably too costly in 2004 vs mechanical relay which are only a couple dollars wholesale. You can make fun, but I fixed the damn thing....
I put everything back together now my engine wont turn over any ideas.
So sorry to hear. Maybe start with checking all the fuses...
I was about to drop the tank in wife’s 04 expedition! Thanks a ton!! Still may have to but I’m running this one down first. I would have lost my sht if I dropped the fuel tank and replaced that over priced p.o.s. Pump and not fixed it! Thanks friend
You can check voltage on the gas pump before and also there's module in between the pump and fuse box. It sits on rear wheel driver side you can test with a lead or pin super easy . I went thru all this and it's painful
@@octaviogarcia928 thanks!
I'm from the Phils.🇵🇭 I have a problem on ford expedition crank only no start the problem is in fuel pump.i don't know if I have to re place a new one or to check also from fuses to harness up to fuel pump driver.i hope If I chat to ask you would like to help me?
If you cand find the wires that send power to the fuel pump, you can measure the voltage with the key "on" to see if it is getting power. If it is, replacement of the pump is in order. If there is "no" voltage to the pump, you will need to check the fuses first and then the relay. The placement of the relay varies from truck to truck, but is buried somewhere in the fuse block assembly.
Also he needs to check the fuel pump breaker, it may need to reset it.
😒 Promo`SM
I have absolutely no idea what that means...
I have bypass that relay!(