p1451 driving me crazy
Thread Starter
|
New User
Joined: Jul 2017
Posts: 4
Likes: 0
p1451 driving me crazy
hello everybody,
i have been been a member on here for awhile but for some reason I could not retrieve my password.
I am am having a problem with the p1451 Evap solenoid code.
I have tried two different evap solenoids. I have verified 12volts on the red wire. I checked the resistance of the solenoid and it falls within range.
Also I have removed the canister filter and opened it up and cleaned the filter pads in it. The only thing I have not done is replace the rubber hose that goes from the canister to the fuel tank. It is very rotted looking. My other question is what should I check with the other wire on the solenoid? The red one is 12volts but I take it the other side is the return back to the PCM? I have not bought a replacement canister filter yet because of its expense.
Any help and info would be greatly appreciated.
Thank you
i have been been a member on here for awhile but for some reason I could not retrieve my password.
I am am having a problem with the p1451 Evap solenoid code.
I have tried two different evap solenoids. I have verified 12volts on the red wire. I checked the resistance of the solenoid and it falls within range.
Also I have removed the canister filter and opened it up and cleaned the filter pads in it. The only thing I have not done is replace the rubber hose that goes from the canister to the fuel tank. It is very rotted looking. My other question is what should I check with the other wire on the solenoid? The red one is 12volts but I take it the other side is the return back to the PCM? I have not bought a replacement canister filter yet because of its expense.
Any help and info would be greatly appreciated.
Thank you
Thread Starter
|
New User
Joined: Jul 2017
Posts: 4
Likes: 0
I am checking the one on the evap canister filter in the back by the spare tire. I also checked the one in the front on the fire wall. I have been reading a lot of the threads for this issue and everything is saying that it is a circuit fault. So I am going to test the wire again. I am thinking of connecting a 12 volt test light and see if it is getting the signal from the pcm when it initiates a purge. Does that sound right?
Thank you
Thank you
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
That would be the "vent" solenoid. The "purge" solenoid is the one on the firewall. Your problem is with the circuit for the vent solenoid only.
The PCM applies a ground to the "low" side of the solenoid's coil to energize it.
Verify the power feed to the coil's "high" side is good, then verify the circuit integrity of the "low" side signal path back to the PCM's output (continuity check, power removed). You can also measure the resistance of the coil to verify that it is in spec.
Most of these faults are due to corroded wires near the solenoid, based on past experiences. Doesn't mean yours is or isn't but be on the lookout anyway.
The PCM applies a ground to the "low" side of the solenoid's coil to energize it.
Verify the power feed to the coil's "high" side is good, then verify the circuit integrity of the "low" side signal path back to the PCM's output (continuity check, power removed). You can also measure the resistance of the coil to verify that it is in spec.
Most of these faults are due to corroded wires near the solenoid, based on past experiences. Doesn't mean yours is or isn't but be on the lookout anyway.
Thread Starter
|
New User
Joined: Jul 2017
Posts: 4
Likes: 0
Ok update time.
For about 2 weeks the problem was gone. Then it came back today. So I went ahead and traced out the wires for the connector going from the back to the front. Well underneath the air filter box is were the went into another connection and sure enough tone of the wires had been rubbing on the metal bracket and had exposed the wire. What I think cleared it for the two weeks was I had changed the air filter so I may have moved those wires just enough so they did not ground out but after driving around eventually touched again.
Logistics Pro
Joined: Jan 2001
Posts: 3,740
Likes: 37
From: Central NYS
Trending Topics
New User
Joined: Apr 2018
Posts: 3
Likes: 0
Emissions circuit malfunction p1451
That would be the "vent" solenoid. The "purge" solenoid is the one on the firewall. Your problem is with the circuit for the vent solenoid only.
The PCM applies a ground to the "low" side of the solenoid's coil to energize it.
Verify the power feed to the coil's "high" side is good, then verify the circuit integrity of the "low" side signal path back to the PCM's output (continuity check, power removed). You can also measure the resistance of the coil to verify that it is in spec.
Most of these faults are due to corroded wires near the solenoid, based on past experiences. Doesn't mean yours is or isn't but be on the lookout anyway.
The PCM applies a ground to the "low" side of the solenoid's coil to energize it.
Verify the power feed to the coil's "high" side is good, then verify the circuit integrity of the "low" side signal path back to the PCM's output (continuity check, power removed). You can also measure the resistance of the coil to verify that it is in spec.
Most of these faults are due to corroded wires near the solenoid, based on past experiences. Doesn't mean yours is or isn't but be on the lookout anyway.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post
rollinblacksmoke
1973 - 1979 F-100 & Larger F-Series Trucks
6
Dec 31, 2013 08:40 AM
jsmorris
Explorer, Sport Trac, Mountaineer & Aviator
7
Dec 3, 2010 06:33 AM
xirxious
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
1
Feb 27, 2010 11:30 AM