Yea I know about ohms law. It is the schematics, that I have problems with.


You are a riot

Send me your machete

 

Differential Pressure Feedback EGR Sensor

The DPFE sensor is a ceramic, capacitive type pressure transducer. The sensor outputs a voltage to the PCM in direct proportion to the pressure drop across the orifice in the EGR pipe. In this way the PCM can make an accurate assessment of the gas flow through the tube. Two different sensors are in use, one metal cased and the other plastic. These sensors should not be interchanged - further, some sensors have a modified voltage output.

Sensor view and data:





_________________________________________


My DPFE Sensor Data (functioning correctly or as they should) ~



__________________________________________

Numbers @ The Connector

Here's some readings / (Engine Off)

Key Off:

Bottom wire VREF = 0.02
Middle wire SIG RTN = 0.00
Top wire SIGNAL = 0.02

_______________________________

Key in run position (Engine Off)

Key On:

Bottom Wire VREF = 5.08
Middle Wire SIG RTN = 0.04
Top Wire SIGNAL = 5.05

__________________________________

Well, I made a short video for you guys Tumba/usmc14. Here's what changes (how it's suppose to work) when running thru the rpms. Monitoring CENTER wire (Signal return) -

http://picasaweb.google.com/jbrew393...07882591006386

Reference voltage is that of the middle wire (SIG RTN) before start KOEO~0.04/ KOER~0.10 to WOT~0.19. This is what needs to change with flow/RPMS. Your numbers may vary and - should be higher than mine since I'm running Long Tubes and HF Cats.

Hope this helps, - it better

 

Mine is definitely bad. But I've been down this road many times.
Mine has the bracket for the bolt on one. The dealership parts dept says mine is supposed to have the plastic one. I wonder since my vref is 4 volts instead of 5, have I been putting the wrong type on there. Before they crossed the lines that is. This has been a long term problem for me.

Thanks again jbrew

 

No problem. Well, they do say that the difference between sensors is that some have a modified voltage out put. But what needs to function is the signal return like in the vid. If that's functioning (changing) - It's good. Yea, I would check the sig rtn, like I did,- first anyway.

Hey Tumba- Did the Video work on your end ? It didn't a couple of times here, but seems to be now. If it didn't on your end, then you have know idea what I'm talking about lol.

 

JBrew thanks for the video. It did play and I will being trying that in the next couple of days since it is already late and been a long day at the office. So I will back probe the DPFE with the red lead and then run the black lead to ground and then check off, at idle and then with increased RPMs I will let you you know the results. This is going to tick me off if I got a bad DPFE from Ford but I hope it is bad so I can finally get it fixed. thanks again

 

That is definatly Technical article material there. All you have to do is put some voice overs with that Video, and you'll have one hell of an article.

The other end of that story is, I have a bad DPFE, I had the understanding of what was going on, and I just don't get much time to actually work on it, so everything is a slow go for me.
I always try to get my questions answered, hypothetically, and real time issues, Times are tough, and I have to keep seven cars up, and my day job too.

 

Bad Picture - But I used the battery ground since I could reach it easy enough.

 

You might be right, but I didn't take the time to see what the other wires are doing w/engine running. I just tapped the one that determines - Good or Bad , so it's a little incomplete. - If you want, go ahead and use my info and call it your own. You have a "White Truck" right

I hear there's some drug out there that may help. I'm not sure what it's called , -but you can stay up for 3 days straight with NO side effects!!

 

That was pretty good, and proved to me ,what one problem is. So that is two different problems on the same system this week.

Last night, the other problem I had was a bearing on a mower deck, and a wheel caliper on the 98. I also think I'm going to Lengthen the brake master cylinder push rod on the 98 this weekend. The pedal is firm, but kind of low. I was reading an old thread about that issue and like what the guy did. I have already done it on the 97 when I had brake issues. But that had multiple problems also
Tonight it's going to be a cam sensor and actuator on the Envoy, and what ever else breaks today.

 

All of these things, just further proves to me, how a dealership has been screwing me. If I had half my money back, I'd be wealthy