DPFE sensor - simple test

[gw33gp]

I have been having a problem with my 'Check Engine' light coming on recently. I was trying to get it ready for Emissions testing and that would not let it pass. I pulled the codes and got 'insufficient flow in the EGR system'. I ran a few quick tests and narrowed it down to it most likely being the DPFE sensor but the tests for it were complicated. I kept searching for a simple test and finally found one. The DPFE sensor has three pins and resistance should be measured from either end ones to the center. I found one had an open circuit and that was enough for me to order a new DPFE sensor.

When the new one arrived, I checked it and sure enough both ends showed resistance to the center. I installed it and I have no more CEL. The Ranger passed emissions and I am good for another two years.

 

[naford]

If I'm not mistaken there is a very nice write up in the tech section on how to test the DPE.

 

[gw33gp]

If there is a write up on testing the DFFE sensor in the tech section, I couldn't find it. After a lot of searching, I only found one reference to using the conductivity test between the pins on the DPFE sensor. Of course there may be more references to it but I stop looking when I first found it. I knew that was a simple test and went with it.