Now i can't remember the code but my light came on awhile back and talked to a ford tech and he said it was the vent valve solenoid so i replaced it last night...fired up the truck and no light on! then shut it off went in for dinner and then after dinner came out to take the g/f to the movies started it up and TA DA! light back on I am an a Apprentice at Toyota so I do have some knowledge so if anybody has any checks or ideas that would be great. I have not been able to check the light yet to see if its the same code but i will monday. What should i do if it is? Thanks for all your help.

 

just get the code and go from there. and did it have anything to do with the evap system? if so check your gas cap.

 

Get your code

 

my purple hands tell me you didnt even try to figure out the cause... start there then come to us.

 

The code was P1451 did a search on here and found that it was the vent valve solenoid so i've replaced that and the light came back on and its the same code.

 

you have to delete the code after repairing the problem. otherwise the computer still thinks you have a problem...

 

deleted it today when i got to work was out until i went for lunch

 

P1451 Description - Evap. Emission Control Sys. Vent Control Valve Circuit Malf.

P1451 Lack of Response From Passive Anti-Theft System Module - Engine Disabled

Huh, that's strange - Why am I getting 2 definitions for the 98 ?

 

truck doesn't have theft system...but that is weird

 

Yea , it sure is - First time I seen that. Anyway , here's the system diagram -



Actually, this can get confusing. There's two parts referred to as the vent solenoid. The purge valve has solenoid attached.

Above the rear axle is another. But if they replace that, that have to replace the charcoal filter as well.

Which was replaced?

There's also a vent on top of the tank.

I think it's the rear solenoid above the rear axle they replaced = #9 .

BTW - You could have a broken wire in the harness. Check the circuit for power and/or correct voltage. Mines been disconnected since 2002 - So my EVAP doesn't run. Never had a problem with my 98 since.

 

yes it was number 9 that i replaced. so i should follow the wires that plug into that solenoid and see if they are cracked? what should i get for voltage there?

 

I can't remember - Pick up a Haynes or Chiltons book for the numbers. What I did is left the solenoid plugged in and removed the filter and hose. No odor problems or anything like that. I just haven't got around to getting a new box for it yet . It never thru that code again after hose removal.

This one above the rear axle -

 

so you left the vent solenoid plugged in and deleted the whole charcol canister? That bitch is pretty heavy for what it is. I might do that if you havent had any problems with yours

or is that the vent for the canister itself?

 

Yes sir, Partick. It's been disconnected since 02. Just the the filter piece and hose. All electrical connectors remain plugged in. That filter deal plugs into the back of the solenoid and in my model, the other end of the hose runs into a compartment in the fuel tank area. I'm pretty sure it's there to control fuel odor. Never had a problem with that . Never a problem in the EVAP system.

I contradict what I posted earlier, my EVAP does indeed run. Otherwise, I would have the P1000 code and the scanner I have tells me what monitors have not run. Everything runs and works fine.

 

Where were you guys on the last one of these ? I said the same thing, then that Quintin fella tried ripping me a new one.... Fawkers !!