Diagnostics code 401, please help !
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Diagnostics code 401, please help !
HI there
I'm a newbie to the forum and actually have a 1999 Mazda Troy Lee addition with the 3.0 V6 (Ford built as I am sure you already know !)
Anyway I am getting a Code PO401 - EGR restrictive Flow.
I am wondering if this is actually a problem with the EGR valve or if it could possibly be the EGR pressure Sensor. Any help is appreciated !
A little more info. I can clear the code and it will take about 25 - 30 min. of driving before it will return.
Thanks
I'm a newbie to the forum and actually have a 1999 Mazda Troy Lee addition with the 3.0 V6 (Ford built as I am sure you already know !)
Anyway I am getting a Code PO401 - EGR restrictive Flow.
I am wondering if this is actually a problem with the EGR valve or if it could possibly be the EGR pressure Sensor. Any help is appreciated !
A little more info. I can clear the code and it will take about 25 - 30 min. of driving before it will return.
Thanks
Last edited by 99pickup; Jul 26, 2004 at 06:52 AM. Reason: Edited title
Post Fiend
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From: Connecticut
Common code on the 3.0L, which is why my vote would be the "EGR pressure Sensor", which is more commonly known as the Differential Pressure Feedback EGR (DPFE) sensor. They tend to fail after a few years. Here are a few relevant links:
Ford DPFE/EGR System Summary
DPFE Vacuum & Voltage Test
P.S. Welcome to FTE!
Ford DPFE/EGR System Summary
DPFE Vacuum & Voltage Test
P.S. Welcome to FTE!
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From: Rosebud
When you remove the EGR valve,under it you will find a finger sized hole,at the BOTTOM of this is a SMALL port that needs to be poked out with a stiff piece of wire then a pipe cleaner.this port being clogged will cause a 401 code.
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Thanks for the advice !!
I appreciate everyones input.
Still not sure which one to try first EGR or the sensor.
But did give me a few ideas to look at.
I'll look everything over real good this evening and see if it is something obvious
and then try and make a desision then.
Still not sure which one to try first EGR or the sensor.
But did give me a few ideas to look at.
I'll look everything over real good this evening and see if it is something obvious
and then try and make a desision then.
Post Fiend
Joined: Jan 2003
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From: Connecticut
Why not do it in sequence ...remove the EGR valve and clean out the port (good suggestion), clear the code, and then drive around and see if the code comes back. So far, no $ spent.
Then, if the code comes back, I think you can be pretty sure its the DPFE.
Then, if the code comes back, I think you can be pretty sure its the DPFE.
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From: SW Va
I like the ideas Vin95 & Rockledge posted, at least you'll know the EGR & it's troublesome port will be clean & all that will cost is a little time & effort.
As Rockledge said, if cleaning the EGR doesn't do it, then suspect the DPFE, now replacing that will cost you some gold.
Pick up a Haynes manual for your ride at your local autoparts store or check one out at the library. It has several tests, mechanical & electrical, you can perform on the DPFE to see if it's electrically & mechanically doing it's thing, or getting the proper signal from the computer to operate the EGR properly.
The computer takes it's ques from other sensors like coolant temp, MAF, ect, ect to tell the DPFE when to turn the EGR on & for how long, so inputs from these other sensors also have to be considered in troubleshooting.
Take your time, don't just begin throwing parts at the problem & hope to get lucky.
Let us know how it goes.
As Rockledge said, if cleaning the EGR doesn't do it, then suspect the DPFE, now replacing that will cost you some gold.
Pick up a Haynes manual for your ride at your local autoparts store or check one out at the library. It has several tests, mechanical & electrical, you can perform on the DPFE to see if it's electrically & mechanically doing it's thing, or getting the proper signal from the computer to operate the EGR properly.
The computer takes it's ques from other sensors like coolant temp, MAF, ect, ect to tell the DPFE when to turn the EGR on & for how long, so inputs from these other sensors also have to be considered in troubleshooting.
Take your time, don't just begin throwing parts at the problem & hope to get lucky.
Let us know how it goes.
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Still no luck !!
Originally Posted by pawpaw
I like the ideas Vin95 & Rockledge posted, at least you'll know the EGR & it's troublesome port will be clean & all that will cost is a little time & effort.
As Rockledge said, if cleaning the EGR doesn't do it, then suspect the DPFE, now replacing that will cost you some gold.
Pick up a Haynes manual for your ride at your local autoparts store or check one out at the library. It has several tests, mechanical & electrical, you can perform on the DPFE to see if it's electrically & mechanically doing it's thing, or getting the proper signal from the computer to operate the EGR properly.
The computer takes it's ques from other sensors like coolant temp, MAF, ect, ect to tell the DPFE when to turn the EGR on & for how long, so inputs from these other sensors also have to be considered in troubleshooting.
Take your time, don't just begin throwing parts at the problem & hope to get lucky.
Let us know how it goes.
As Rockledge said, if cleaning the EGR doesn't do it, then suspect the DPFE, now replacing that will cost you some gold.
Pick up a Haynes manual for your ride at your local autoparts store or check one out at the library. It has several tests, mechanical & electrical, you can perform on the DPFE to see if it's electrically & mechanically doing it's thing, or getting the proper signal from the computer to operate the EGR properly.
The computer takes it's ques from other sensors like coolant temp, MAF, ect, ect to tell the DPFE when to turn the EGR on & for how long, so inputs from these other sensors also have to be considered in troubleshooting.
Take your time, don't just begin throwing parts at the problem & hope to get lucky.
Let us know how it goes.
I sure hope that fixes it !!
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Originally Posted by Vin 95
When you remove the EGR valve,under it you will find a finger sized hole,at the BOTTOM of this is a SMALL port that needs to be poked out with a stiff piece of wire then a pipe cleaner.this port being clogged will cause a 401 code.
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From: SW Va
Ok 99Pickup, the DPFE solnoid resistance values should fall between 30 & 70 ohms.
Check your battery voltage to be shure it's up to snuff, then pull the DPFE electrical connector & measure the incoming voltage from the computer with KOEO, (Key ON Engine Off), VREF should be between 4 & 6 volts. If not, look up stream to the PCM, or your battery voltage is low.
There are also some electrical/mechanical tests to see if your DPFE is functioning properly.
Check your battery voltage to be shure it's up to snuff, then pull the DPFE electrical connector & measure the incoming voltage from the computer with KOEO, (Key ON Engine Off), VREF should be between 4 & 6 volts. If not, look up stream to the PCM, or your battery voltage is low.
There are also some electrical/mechanical tests to see if your DPFE is functioning properly.
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Originally Posted by Vin 95
No, Its at the bottom of the hole that the EGR covers in the intake manifold.
If I am reading correctly then the Small hole is back up inside the hole where the EGR bolts to the manifold (2 bolts and gasket) correct ?
I'll have to pull it off and look up in there again ...I must have missed it or mine isn't the same.
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From: Rosebud
Yes! your on to it. the small hole is back up inside the hole where the EGR bolts to the manifold.you'll need a STIFF peice of wire to poke it out. bailing wire works well,and a coathanger might go through but it would be tight.once you get a peice of wire to go through the port,ream it on out with a pipe cleaner or two.
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Originally Posted by Vin 95
Yes! your on to it. the small hole is back up inside the hole where the EGR bolts to the manifold.you'll need a STIFF peice of wire to poke it out. bailing wire works well,and a coathanger might go through but it would be tight.once you get a peice of wire to go through the port,ream it on out with a pipe cleaner or two.
THanks again
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