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'02 f150 p1451


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neileo
User

Apr 18, 2015, 9:48 AM

Post #1 of 31 (2594 views)
  post locked   '02 f150 p1451  

i looked up what the code means and it had a couple different things that could be wrong, im a pretty handy guy so im trying to repair it myself but im just not sure what to look for on my truck. http://www.obd-codes.com/p1451-ford on that website it says what the code means and how there could be a couple different reasons it appeared and im not sure what exactly to do to fix it, any help would be greatly appreciated. if you need more info on the vehicle then just ask and i will be happy to tell you what you need to know


neileo
User

Apr 18, 2015, 9:57 AM

Post #2 of 31 (2583 views)
  post locked   Re: '02 f150 p1451  

sorry about the link i just wanted to show people what i read about the error code


Discretesignals
Ultimate Carjunky / Moderator
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Apr 18, 2015, 10:04 AM

Post #3 of 31 (2578 views)
  post locked   Re: '02 f150 p1451  

Which engine?





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neileo
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Apr 18, 2015, 10:19 AM

Post #4 of 31 (2575 views)
  post locked   Re: '02 f150 p1451  

4.6l


Discretesignals
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Apr 18, 2015, 10:41 AM

Post #5 of 31 (2560 views)
  post locked   Re: '02 f150 p1451  

P1451 means the engine computer detected a circuit problem for the EVAP canister vent solenoid. This basically means there is an electrical problem with the canister vent soleniod circuit. This could be an open or short in the circuit, an open or short in the canister vent soleniod coil windings, or no circuit control from the engine computer.

First thing you should is a visual inspection of the canister vent solenoid, wiring, connector, and terminals inside the connector and solenoid. If all that looks good, your going to have to break out the volt( VOM) meter and possibly some jumpers. You also need something to back probe the connector on the vent solenoid, so you can do some voltage drop measurements.

The only thing you won't be able to do is to test the engine computer's ability to ground the circuit. You need a scanner that has bi directional control, but hopefully it doesn't come to that.

The solenoid valve is located on top of the charcoal canister underneath the vehicle aft of the fuel tank, number 9.

Vent solenoid:







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(This post was edited by Discretesignals on Apr 18, 2015, 10:46 AM)


neileo
User

Apr 18, 2015, 10:49 AM

Post #6 of 31 (2555 views)
  post locked   Re: '02 f150 p1451  

is it closer to the back end or front end of the truck


Discretesignals
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Apr 18, 2015, 10:50 AM

Post #7 of 31 (2552 views)
  post locked   Re: '02 f150 p1451  

Is is located in the picture above, number 9, if you didn't see it while I was doing some editing.





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(This post was edited by Discretesignals on Apr 18, 2015, 10:51 AM)


neileo
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Apr 18, 2015, 10:51 AM

Post #8 of 31 (2550 views)
  post locked   Re: '02 f150 p1451  

according to the diagram am i going to have to check each point or should i check only certain ones


Discretesignals
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Apr 18, 2015, 10:55 AM

Post #9 of 31 (2546 views)
  post locked   Re: '02 f150 p1451  

Not sure what you mean. The engine controller is flagging a code for an electrical problem in the vent solenoid circuit. You shouldn't have to worry about finding EVAP leaks or other EVAP issues not related to the code....just yet.





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neileo
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Apr 18, 2015, 11:03 AM

Post #10 of 31 (2544 views)
  post locked   Re: '02 f150 p1451  

i believe i found the part, is it no bigger than my hand? the part im looking at has an electrical wire going in at one end then a tube for what im assuming exhaust or some type of gas would go through, which leads into a box, would you like a picture?


Discretesignals
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Apr 18, 2015, 11:07 AM

Post #11 of 31 (2543 views)
  post locked   Re: '02 f150 p1451  

Sure





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neileo
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Apr 18, 2015, 11:20 AM

Post #12 of 31 (2541 views)
  post locked   Re: '02 f150 p1451  

s there any other way to upload photos other than through that website because my photo is in a jpeg but it wont allow me to upload it


Discretesignals
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Apr 18, 2015, 11:22 AM

Post #13 of 31 (2539 views)
  post locked   Re: '02 f150 p1451  

Which website are you using to host your picture?





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neileo
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Apr 18, 2015, 11:25 AM

Post #14 of 31 (2537 views)
  post locked   Re: '02 f150 p1451  

the image management system one that it defaults to when you click upload but my photos are bigger than 1024kb which is the max


Discretesignals
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Apr 18, 2015, 11:31 AM

Post #15 of 31 (2529 views)
  post locked   Re: '02 f150 p1451  

To be honest with you, that thing is rittled with bugs.

You could use a hosting site such as photobucket or others. Then paste the link to your pic in here.





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neileo
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Apr 18, 2015, 11:33 AM

Post #16 of 31 (2528 views)
  post locked   Re: '02 f150 p1451  

this link should show you my picture https://docs.google.com/...Ih1gHdtZImeyfam8/pub


See if I can make that show direct for you........



Got enough rust there to mess it up alone. Connector doesn't look so special either - I can't see how any code is going to go away without that stuff intact,


T


(This post was edited by Discretesignals on Apr 18, 2015, 11:46 AM)


neileo
User

Apr 18, 2015, 11:36 AM

Post #17 of 31 (2522 views)
  post locked   Re: '02 f150 p1451  

this is a bigger picture were that part connects to this box
https://docs.google.com/document/d/1rhhRkrewyFC1cbVgNF-Fu2jdutXFVzg7OkbO_K6x9fI/pub


Tom Greenleaf
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Apr 18, 2015, 11:41 AM

Post #18 of 31 (2513 views)
  post locked   Re: '02 f150 p1451  

Pic is there now. Too wide and couldn't change it. Can be taken out and put back by any moderator or perhaps resized so it fits better on most views,


T



neileo
User

Apr 18, 2015, 11:41 AM

Post #19 of 31 (2511 views)
  post locked   Re: '02 f150 p1451  

i can see the whole picture thanks, so is that the right part im looking for?


Discretesignals
Ultimate Carjunky / Moderator
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Apr 18, 2015, 11:42 AM

Post #20 of 31 (2509 views)
  post locked   Re: '02 f150 p1451  

That is definitely the canister vent solenoid valve. Looks like your in the rust belt.

If you have an ohm meter, measure the resistance of the solenoid. You can also take that valve and bench test it by applying battery and ground to each terminal in the valve's connector socket. The valve should click when power is applied to it.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Apr 18, 2015, 11:43 AM)


neileo
User

Apr 18, 2015, 11:48 AM

Post #21 of 31 (2505 views)
  post locked   Re: '02 f150 p1451  

i have an ohm mete, so would i disconnect the part from the electric system and test it? what should the resistance be, and yea she's pretty rusty underneath


neileo
User

Apr 18, 2015, 12:02 PM

Post #22 of 31 (2500 views)
  post locked   Re: '02 f150 p1451  

so it was at 59.8 on the ohms meter but i found a wire that was broke off and i cant reconnect the wires because it broke of right at the point it connects to the plastic connector, if that made sense


Discretesignals
Ultimate Carjunky / Moderator
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Apr 18, 2015, 12:13 PM

Post #23 of 31 (2498 views)
  post locked   Re: '02 f150 p1451  

A broken wire is definitely going to cause your issue. That valve looks really sad. Probably wouldn't hurt to replace it if possible. Factory specs is 48 to 65 ohms. You should still bench test it by applying power and ground to see if it is functional if you want to keep it. Looks like it came off the Titanic....lol

As for the wiring, there are actually connector pigtails available for that or you can hack one off at a salvage yard.

Motorcraft: p/n wpt322
Wells: p/n 1p1783





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Apr 18, 2015, 12:45 PM)


neileo
User

Apr 18, 2015, 12:39 PM

Post #24 of 31 (2492 views)
  post locked   Re: '02 f150 p1451  

yea i may just buy the whole part if i can find a good looking one at pull a part but if i cant i will get the wiring for now, thanks for all you help i really appreciate it, if i have more problems relating to this i will reply to one of you comments on this post


Discretesignals
Ultimate Carjunky / Moderator
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Apr 18, 2015, 12:44 PM

Post #25 of 31 (2491 views)
  post locked   Re: '02 f150 p1451  

Your welcome. After you get your valve and wiring repaired, please come back in here and let us know how things turned out. Helps others that may run into this sort of problem to see how you resolved it. Wink





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.






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