I'm a semi retired electronic tech. This was very accurate. My wife's 1999 4.6 Liter Ford Expedition has an intermittent more annoying than really worrisome problem. it gets a little rough. it seems to affect shifting..but not always. Auto Zone scanner said it needed to have the DPFE replaced. I am not a parts replacer as such.. I want to know how something works and how it's designed. I now see why the EGR is so necessary.. It is a safety engenering part to prevent damage. I subscribed and rang the bell. I am going to your site.
Thank you for the kind words. If you are melting sensors and have a lot of pressure on the hoses, it usually means your catalytic convertor is restricted. I suggest getting the back pressure on the exhaust system tested. I hope this helps and stay in touch, Mark Hicks Wells Vehicle Electronics
The specs for your DPFE should be the same as in the video, 1.0 volts. If the hoses are blowing off and get very hot it means the exhaust system is restricted. This usually means the catalytic convertor is plugged. To be sure have the back pressure on the exhaust checked. Mark Hicks Wells Vehicle Electronics
1. Disconnect the shift linkage at the transmission and move the linkage on the transmission by hand. If the transmission still won't engage, there is an internal transmission problem. 2. If the transmission does engage when moving the linkage manually, check for a problem with the shift lever or cable. Mark Hicks Wells Vehicle Electronics
thank you, this will really help me, im am currently a student at ohio tech college for their auto-diesel program, and my moms car just put this code on, now i can go fix it today, instead of waiting for monday to take it to school and do it!
David Miller Excellent! Always happy to hear a successful ending! We are now offering "live" training classes on RU-vid you might be interesting in checking out. Here is the info to sign up: Click on this link for more information and to subscribe.www.wellsve.com/webcasts.html Englishes.wellsve.com/webcasts.html EspañolMark Hicks Wells Vehicle Electronics
@MsMlarrea 1. Inspect the connection of the Differential Pressure Feedback EGR (DPFE) sensor for good contact to the sensor. 2. Check the Brown/White (BR/W) wire for 5.0 volts to the sensor when the Differential Pressure Feedback EGR (DPFE) sensor signal reading is high, and, that the Grey/Red (GY/R) wire is a good ground. Mark Hicks Wells Vehicle Electronics
Re-check the DPFE like it shows in the video. The hoses going to the DPFE are special heat resistance type. Be sure you are using the correct hose. If the hoses look like they have gotten hot or the DPFE looks a little melted, it means your catalytic convertor is restricted. Did you clean the tube going to the exhaust pipe? When you do make sure there is flow completely through. There is a small orifice inside the pipe that plugs. Stay in touch, Mark Hicks Wells Vehicle Electronics
Check voltage of the Differential Pressure Feedback EGR (DPFE) sensor. Normal voltage should be 0.5-1.2 volts Key On Engine Off (KOEO) or at idle. If voltage is out of range, check voltage again with the sensor disconnected, it should read 5.0 volts. If it does, and there is 5.0 volts measured between the Brown/White (BR/WT) and Grey/Red (GY/RD) wire, replace the sensor. Our largest customers are AutoZone and Carquest. Thanks, Mark Hicks Wells Vehicle Electronics
@MsMlarrea 3. Check for a possible backpressure issue which may be damaging the sensor because of exhaust heat melting the sensor internally. To check this, connect a vacuum/pressure gauge to the DPFE sensor tube that connects to the sensors "HI" port. Monitor the reading while brake-torquing the engine. Backpressure should not exceed 2 PSI. 4. If the DPFE sensor connector is ok and there is not excessive exhaust backpressure, replace the DPFE sensor.
Thanks!! P0402 code for excessive flow had the same fix on my 2002 ford explorer. DPFE read 3.5 volts instead of .8 to 1.2. $32 dollar 20 minute fix in the parking lot of auto-zone.
@IrnMaiden304 Yes they were aluminum cases. In fact we manufactured and sold the aluminum housing until the foundry stop producing them. Reason? On some application the plastic replacement needed a new wiring harness, we wanted to produce a direct replacement for as long as possible. the reason ford updates was because of RFI problems. We updated the circuitry but stayed with the aluminum housing as long as possible. Mark Hicks Wells Vehicle Electronics
I think you are talking about the DPFE sensor? I think I answered this before? Check voltage of the Differential Pressure Feedback EGR (DPFE) sensor. Normal voltage should be 0.5-1.2 volts Key On Engine Off (KOEO) or at idle. If voltage is out of range, check voltage again with the sensor disconnected, it should read 5.0 volts. If it does, and there is 5.0 volts measured between the Brown/White (BR/WT) and Grey/Red (GY/RD) wire, replace the sensor. Mark Hicks Wells Vehicle Electronics
Be sure to check the DPFE like I told you. 9 times out of 10 the P1407 is a defective DPFE. Also closely check the hoses coming up from the exhaust. If the Catalytic Converter is restricted the hoses will deform and crack. Mark Hicks Wells Vehicle Electronics
@svt0304cobra You have to get enough misfires in a certian time period to set a code. It might be right on the edge. When you say you smell rotten eggs, it means either it is running rich or you have a misfire or both. Please clean the MAF. Please do as I am telling you, it will give a good starting point if not the answer. Mark Hicks Wells Vehicle Electronics
Well not good news, but at least you know for sure what it is. Thanks for letting us all know! Till next time, take care, Mark Hicks Wells Vehicle Electronics
3. Disconnect the White hose from the vacuum control valve and plug it, connect a vacuum gauge to the port, and with the engine idling there should be at least 6.7" of vacuum. 4. Disconnect the EGR solenoid and apply power to one terminal and ground to the other, the solenoid should block any flow, remove the voltage and ground and vacuum should flow through the valve. It is common for the EGR solenoid to fail. Let me know please, Mark Hicks Wells Vehicle Electronics
It sounds like the catalytic convertor is restricted. Have you had the back pressure in the exhaust checked? One this you can do to do a quick check is remove the front O2 sensor(s). If there is an improvement , most likely the cats are plugged. Don't leave the O2s out for very long. Mark Hicks Wells Vehicle Electronics
Great news! To make sure the speed sensor is good, connect your meter and drive the vehicle, the sensor should generate an AC voltage that increases with speed. Sorry no video yet ... Mark Hicks Wells Vehicle Electronics
I have a 2002 Mitsubishi Montero Sport 3.5L and I have the P401 code. I already replaced the EGR valve and took off the manifold and cleaned all the ports. P401 still showing up. I bought a vacuum pump and tested the MAP sensor and with the key to on it read 5 v. I had the red lead on the green wire and black wire to ground. I squeezed the hand pump and went to 5,10, 15 units and voltage still 5 v. I assumed it was bad so I bought a new one. I tested the new one with same results.
The restricted EGR will not cause the engine to run richer. Too much EGR could cause this to happen. It is time to have the back pressure of the cats checked. Let me know what you find, Mark Hicks Wells Vehicle Electronics
I've been searching on the internet to see what part is what. I don't know what the EGR solenoid or the vacuum control valve looks like on a 2002 Mitsubishi Montero Sport. I looked at 2 different websites and their picture for the VCV were different. I will run the tests once I confirm the those parts from you.
1. Disconnect the green striped hose from the Exhaust Gas Recirculation (EGR) valve with the engine warmed up and running. Rev the engine, the vacuum should increase to at least 3.9". 2. With a hand vacuum pump connected to the EGR, increase the vacuum to 8.7", the engine should stall or at least run real rough.
@svt0304cobra Fist check and clean the MAF sensor. If that does not take care of the problem, I would like to have you put it onto a scan tool. Check the misfire counts. If one or two are particularly high swap the coils on those cylinders and see if the misfire follows the coils. Let me know what you find, Mark Hicks Wells Vehicle Electronics
If some of the ports are restricted, you will get excessive flow on the other open port(s). This is why I asked for the codes. When this occurs you will also most times get misfire codes. The fact that you opened the EGR at idle and only got rough running and not an engine kill, makes me think there is some restriction somewhere. Mark Hicks Wells Vehicle Electronics
@DMasterMensionz It may be an early version, but either way we would greatly appreciate getting it back for an analysis. Give us a call on our tech and we will make arrangements to send you a new one and a call tag for you to send the defective one back. This will all be at no cost to you. Our toll free number is 1-800-558-9770 press 3 for the tech department and explain the situation and one of my guys will make the arrangements. Thank you, Mark Hicks Wells Vehicle Electronics
I replaced the sensor, it solves the problem! I also cleaned up the egr valve. Thanks Mark This car has another problem is P0715 it seems to be a problem in many cars, do you have a video about this problem? I´m almost sure than the sensor is good (is a magnetic type, the reading from the coil is 450 ohms and it produce voltage) but i want to be sure! Thanks again!
@svt0304cobra If the service light flashed or came "on". you should have a stored or a pending code. Let me know what you find. Mark Hicks Wells Vehicle Electronics
Great video. I have 96 Continental. When back probing as shown in video, I get 0 readings but car beeps then turns on cooling fan. I'm getting 0 readings when probing other ports as well.
Hey Scott, do you have your meter hooked up properly? You should get some sort of reading on at least one of the wires. Mike Becker, Senior Technical Instructor
Tried different probe today and got readings of 1.19 at signal wire and 5 volts on other. Think I might have a problem with the device that controls vacuum for the "second" egr valve. Need to find out how to test it. Hard to access.
Hey Scott, good, glad you were able to get a reading! You're talking about the EVR? The EGR vacuum regulator solenoid? Mike Becker, Senior Technical Instructor
What I might be calling a "second" egr valve is actually this part in the second pic: www.fordonlyparts.com/1995-1997-lincoln-continental-4-6-dohc-fwd-egr-smog-vacuum-diverter-valve-solenoid-bracket-f57f-9j459-ca-f50e-9f491-aa-f50e-9g426-aa/ The vacuum line that goes to it, originates from a small "sensor" that has two vacuum lines, and is located on engine below coil packs, I want to test it somehow.
Scott, how many wires are going to this part that you want to test? I think you're talking about that vacuum control solenoid. It will have only 2 wires going to it. Mike Becker, Senior Technical Instructor
@svt0304cobra If it is effecting all cylinders, it is very possible to be a crank sensor or a fuel delivery problem. Mark Hicks Wells Vehicle Electronics
Im leaning on replacing the EGR solenoid. The 2 hoses that lead to the DPFE sensor are NOT being blown off the tube or sensor and the DPFE is not being melted. Im just trying to get ideas as to what i need to do next...
Very informative video!! I have an 01 explorer 4.0 V6 and i had issues with P0401. Replaced the EGR valve, DPFE sensor, cleaned all the vacuum lines to/from EGR system and, intake gaskets. And the problem went away for about 3mos (just to pass state emmissions test) and came back the same. Any ideas? I have noticed a major drop in mileage even after using lucas fuel treatment on every oil change...
Great video, I have a 2000 Ford Tuarus with the same problem. I replaced the Egr back pressure sensor cause the old was melted do to the heat from the tubes. I having a problem keeping the sensor on the tubes. It seems there is enough pressure coming out of the tubes to push the heat resistant tubes plus the sensor off. What should I do?
Mark, I hooked the vacuum pump up to the EGR and with the engine revved it stayed at zero. When I increased the vacuum to 8.7 the engine did run rough. I disconnected the hose from the vacuum control valve and put on the vacuum pump and with the engine idling it read 6.5. With the EGR solenoid disconnected I'm not sure how to apply power to that solenoid. Please give me instructions on that.
Hello Jay, I don't believe the 89 7.5L runs a DPFE sensor. This system used a EVP sensor mounted on top of the EGR valve. Ryan Wilsing, Technical Instructor
Hello Mark! I have a skoda octavia an 2012, engine 2.0 tdi and i have the error P0401, insufficient flow, if i wipe the car pulls well, and after a running time gives a bug and does not pull the engine well.What can I check? Thank you!
Hey Marian, chances are when the P0401 code sets it puts the car in some sort of "limp mode" That's probably why it doesn't run well when the code is set. Take a look at the passages for the EGR valve. Maybe they are plugged up with carbon? Mike Becker, Senior Technical Instructor
thanks for the video, will you please to guide me how to chek EGR valve module in my 2006 ford freestar please_ I got P0406 code and my check engine light is on, mtor es 4.2l V6. Thks
Hey Angel, The EGR module on those is a complete unit with a map sensor/ flow sensor installed. To test check the DPFEGR output signal from being stuck over 4.5 volts. If it is, the code P0406 code will set. ~Ryan
It will range depending where the EGR flow is at. Here is a testing procedure.... SIMULATE THE DIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR SIGNAL WITH A VACUUM PUMP Disconnect the downstream differential pressure feedback EGR sensor port hose at the ESM. Verify the hose and port are clear and free of obstructions. Connect a vacuum pump to the downstream differential pressure feedback EGR sensor port. Key ON, engine OFF. Access the PCM and monitor the DPFEGR PID. Apply 27 - 30 kPa (8 - 9 in-Hg) vacuum to the differential pressure feedback EGR sensor and hold for 10 seconds. Quickly release the vacuum. The DPFEGR PID voltage must be between 0.25 and 1.3 volts with the key ON and no vacuum applied. The DPFEGR PID voltage must increase to greater than 4 volts with the vacuum applied. The DPFEGR PID must drop to less than 1.5 volts in less than 3 seconds when the vacuum is released. ~Ryan
What is the problem for my Ford Explorer sports Trac the check engine always come out and takes a lot of fuel 27liter per 100kms with in the City.but long distance it takes 20 Liter per 100kms .thanks this video
Sounds like you have a cooling system problem. I hope it's not cold where you live. Too much water and not enough coolant will lead a cracked block if it freezes. Address your coolant leak/or burning first. Then worry about your cooling fans. Mike Becker, Technical Services Instructor
What code(S) are being set? The PFE sensor should have near one volt on one of the pins with it plugged in. Check it that way by back probing it with a pin. Your engine has small orifices above the intake valve that let the EGR gasses into the cylinder. It is common for these orifices to become blocked. What are the codes? Mark Hicks Wells Vehicle Electronics
hi mark i have 2002 ford escape what happen is that if i start the car theres a whisltling sound and if i run the car i cant go up to 2000 rpm it looks like it chokes and the whistling sound will turn on again every time i go up to 2000 rpm .i clean the fuel injectors , replace all seals for the maniflod clean the egr valve , clean the MAS check hoses. the egr vavle looks good coz if i pinch it under the engine will stall , is it my DPFE or My egr vaccum solenoid?
Juan, you could hook the other lead up to the battery. The volt meter will read a difference between the pins...so If you are checking for power, you can put the black lead on battery negative, and the opposite for checking the ground circuit. Now there is way more in depth testing if you want to get into it...this is a very basic first test. Mike Becker, Technical Services Instructor
Question! The egr valve is the only code that came up when I had it tested... Should the engine light turn off immediately or does it have to go through a cycle?
+phillyrey Good question! The car will have to go through multiple passed test cycles before it will clear the check engine light on its own. Many people will have the code cleared after a repair, either using a scan tool or by disconnecting their battery. Mike Becker, Technical Services Instructor
MMM, no sorry i was refering about the other sensor (code error P0715, magnetic type sensor, if you could tell me, what would be the tipical voltage generated and, how to test the harness wires, to check if one or both are cut or have some other error). Thanks Mark!
Beware haha , Autozone will say you need a new DPFE sensor and will charge you 80-100.00 for the part and the CEL will come back on / stay on after installing the new DPFE sensor , the same code too P0401 will show . Check before buying parts , autozone just likes to throw new parts at you .
Please help , I just made the test with a Voltmeter and both readings from both terminals shows 4.9 Volts , When I was expect to have one in 4.9 V and the other Should read less than 1.2
It does sound like the DPFE is shorted. Verify that the voltage is gone when you unplug the connector. That will ensure the circuit isn't shorted to power before the DPFE. Mike Becker, Technical Services Instructor
You were totally Right !! I just replace the sensor , make the reading again and I got 1.02 Volts on the input signal , , I just disconnect the battery since I don't have a scanner and the Check Engine Signal went away , I can feel the change right Away !! Thank so much MIke !!! I just spend in Autozone $ 20 dollars for the replacement sensor!! Att Happy Man!
thanks for the reply mark!! i checked the DPFE and im getting 1.18-1.22V on it. the EVR shows good resistance and voltage. i ran a stiff copper wire and carb cleaner through the tube that comes from the exh manifold to the EGR vavle to make sure it is clear. i also took out the O2 sensor before the cat and it is almost white. is this a result of overheating cats due to running it richer because of the low egr flow??
I have a 92 ford taurus that has a problem with the transmission engaging. Periodlically when I drive it, then turn it off, then turn it back on again, it won't engage in reverse or drive even though the gear shift is moving the gears (It will move when pushed, in neutral). As well, sometimes when I am hainvg this problem, if I shift it into reverse first, back up then shift into drive it will move. ANY idea what is causing this??
Good video, concise. Holy crap...what annoying music, though. Just your good explanation will do! Head banging does not aid my thinking. Anyway, thanks for the video.
What does it read when it is connected to the sensor? What vehicle and engine size and code do you have? It could be normal. Mark Hicks Wells Vehicle Electronics
Hi jbd desouze, your Explorer does not have a separate DPFE. It is built in with the EGR assembly and not replaceable separately. Mike Becker, Technical Services Instructor
Tony, at this point you should probably take it to a shop. By the sounds of it, you have a pretty nasty coolant issue. If I were to guess...maybe head gaskets. I would definitely recommend taking this in and having it diagnosed. Mike Becker, Technical Services Instructor
Hello. I bought a 2003 Ford Taurus SES 3.0 24 value dohc. The egr pressure sensor is cracked an right hose gone. I found it today looking for a vacuum leak because car runs rough. What problems would or will this cause. I'm not driving the car till I fix it. Great car low miles family one owner vehicle. Thank you for your time.
Without a functioning DPFE, the car will have a check engine light and will not pass emissions. These usually are a pretty easy fix. If the hoses are damaged or worn I would suggest replacing them as well. Mike Becker, Technical Services Instructor
I believe your vehicle has a PFE sensor. I do have a video on this subject. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-o8FRwzgOa6Y.html this is the link. Mark Hicks Wells Vehicle Electronics
So all of the wires probed on the dpfe sensor all need to be within the same dcv? I probed the first one and it came as .962 dcv, the second wire was at 26.9 dcv and the third wire was at 5.01dvc all of this was done with the key on the on position. Engine off
Hey Jancarlo, you are ready 26.9 volts on one wire? That is crazy high! Is this maybe a typo? What kind of vehicle are you working on? Mike Becker, Technical Services Instructor
+Wells Vehicle Electronics well I had a friend give me a new DPFE for free so I never confirmed with certainty it was the issue. But after replacing the CEL comes on as car starts but goes away with gas applied and back on when gas is released. Very few tools and equipment.
Same issue, Cat is restricted. Usually caused by either the engine is running rich or a misfire. If you need any further assistance, let me know, Mark Hicks Wells Vehicle Electronics
