P1441 EVAP System Flow During Non-Purge help needed - 3800Pro.com Forum
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DTC's, Problems & Troubleshooting Getting an engine related DTC? Check here for assistance.

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Old 11-03-2005, 02:21 PM
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P1441 EVAP System Flow During Non-Purge help needed

So, my car gave me an SES, and scanning with Autotap gave me P1441 EVAP System Flow During Non-Purge and something about a cannister being open/not being open.

So I searched before coming here and whining, and came up with this page..
http://gearchatter.com/viewpost14205...6df8b32619cc29

So apparently there is vacuum in my gas tank when the PCM thinks there shouldn't be. I don't know if it's what caused it, but the only other code this car has ever thrown was the code caused by a loose gas cap.

I don't have a vacuum guage so I figured I would just replace the Evaportive Emission Canister Purge Solenoid Valve since valves are usually cheap.

So can someone more knowledgable than me give me some helpful advice???? Like a link to this part or an alternative way to go about fixing this? Also, is my car gonna blow up if I drive it a tiny bit before this is fixed, as it's my only car.

Thanks and take care,
Paul
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Old 11-03-2005, 04:22 PM
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code 1441
Helpfull schematic
Most of the time the problem is the canistor purge valve

Schematic Reference: Evaporative Emissions (EVAP) Hose Routing Diagram

1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2 (yes)
Go to Diagnostic System Check - Engine Controls (no)

2
Are DTCs P0443, P0449, P0452, or P0453 also set?
--
Go to Diagnostic Trouble Code (DTC) List (yes)
Go to Step 3 (no)

3
Remove the fuel fill cap.
Turn ON the ignition, with the engine OFF.
With a scan tool, monitor the FTP.
Does the scan tool indicate FTP within the specified range?
-0.5 to +0.5 in H2O
Go to Step 4 (yes)
Go to DTC P0453 (no)

4
Disconnect the EVAP purge pipe from the EVAP canister purge valve.
Install a hand held vacuum gage to the EVAP purge port.
Disconnect the EVAP canister purge valve harness connector.
Monitor vacuum on the vacuum gage.
Start the engine and allow the engine to idle.
Increase the idle to 1,200-1,500 RPM.
Does the gage indicate an increase in vacuum?
--
Go to Step 5 (yes)
Go to Diagnostic Aids(no)

5
Replace the EVAP canister purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .

Did you complete the replacement?(yes)
--
Go to Step 6
--

6
With a scan tool, capture and record the fail record data and clear the DTCs.
Perform the Service Bay Test. Refer to Service Bay Test .
Does the scan tool indicate that the service bay test passed?
--
Go to Step 7 (yes)
Go to Step 3 (no)

7
With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?
--
Go to Diagnostic Trouble Code (DTC) List (yes)
System OK(no)



--------------------------------------------------------------------------------
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Old 11-08-2005, 02:20 PM
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There is also some information here

http://www.midwest3800.com/forum/viewtopic.php?t=91
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Old 01-13-2013, 03:41 PM
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Smile Sharing my repair method on P1441 code

I searched everywhere in the internet and nothing would convince me with the answer on what's causes the PCM to throw P1441 error code so that I can fix my car without expensive guessing replacement. So I digged on my own. First I needed to know what parts are in the purge system and what each component do. There are two active(electronic) parts in the system, the Vaccum Switch (tells the computer that it's contact switch are close or open) and the Purge solenoid(takes command from the computer either to open or close the solenoid valve for vacuum to flow). From these two components you can isolate exactly where the problem is to fix the P1441 permanently.

At some point during the engine running(all sensors values met), the computer will send a command to the solenoid valve to open to start purging the vapor from the canister,but it also check the vacuum switch (monitors any vacuum flow) if its contacts are close or open. Before the purge flow the computer should see it that contact is close before it purge. The switch should only be turned open by the vacuum force during purging. So if the computer tells the solenoid to open but sees that the vaccum switch was already open ( because it's defective and stucked open), it will throw the code P1441

So Examining the wordings on the error could which says about "System flow during non-purge".

Period of non-purge is when the computer(PCM) is not commanding the purge valve to open.

System Flow means that the vacuum switch was opened by the vacuum flow. If the vaccum is stucked open forever and never closed, it's telling the computer that there's a vacuum flow but the PCM will not believe because the computer did not send a command to the solenoid valve to open to purge.

So here's the sequence to the purge system
At point of non purge- computer not commanding solenoid to open, vaccum switch contacts are close, there's should be no vacuum flow from the canister to the intake, because the solenoid is closed.

When the computer sends the command to the solenoid to open, the vacuum starts to flow from the canister and the vacuum reaches a force to switch the Vacuum switch to open telling the computer that the vacuum is flowing from the canister.

P 1441 code tells me that the following are causing the error.

1. Bad Vaccum switch.
2. Bad connection wire from the Vacum switch to the computer
3. Bad ground wire from the vacuum swtch to ground.
4. Or bad connectors from Vacuum swith to computer, or the logic circiut in the computer itself.

Soi I decided to check the voltage and wiring from the swtich and decided that I need the Vaccum Switch. I went ebay and ordered one. While waiting for few days to receive it. I checked the canister hoses and started replacing old hoses. I also found out that hose from the tank to the canister was disconnected due to lose worn out hose. I fixed that one.

I reset the code even before I replace the Vacuum switch( which still on the transient delivery) and the code P1441 just came right back after few starts.

So I received the switch and installed it on top of the old one because I could not dislodge it from the metal mount. Inserted in wiring connector and the in and out hoses to the new vacuum switch and reset the code and fixed the problem. Wholaa!
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