dpfe trouble code

blk94xlt · Post by **blk94xlt** » Wed Dec 19, 2007 9:19 pm

Dave,
I don't think that there is a difference in the DPFE sensors from 97 to 99. Usually there is a change to the connector if there is a difference in the sensor. I did not end up using the computer that you sent me. When I was trying to get the engine to fire up for the first time I could not get that computer run the fuel pump when I turned the key to 'on'. I had picked up some extra explorer parts and wiring harnesses and a computer so I gave my second computer a try and it worked so I have been using it since then. I'm not sure if there is something wrong with the computer I got from you but it didn't seem to work like this one does. The one I am using now has a calibration code of SLL3. I checked for calibration updates to this and there is one but I don't know how to go about getting it or if it is even needed. They don't have any info on what the latest calibration changes from the previous. I found the update here:
http://www.explorerforum.com/forums/sho ... p?t=183045

I have come across that scorpio site too. I also came across a good explanation of the ford ODBII systems in a 90 page pdf. That comes in handy when stuff like this goes wrong. Also good to know what is going on under the hood with all the sensors and monitors.. etc.

blk94xlt · Post by **blk94xlt** » Thu Dec 20, 2007 2:58 am

Well I ran the test with the engine running this time. I monitored the DPFE voltage with a DMM while the motor was running at idle (around 1500rpm while still cold). With no EGR flow the voltage was around 0.7 volts. When I applied some vaccum to the EGR valve the engine started to run rough. The DPFE voltage climbed as it should while the EG was R-ing so to me it looks like the whole system was working correct.
What I don't know is if the PCM is getting the right DPFE voltage reading. I wish that I had one of the nice scan tools that would allow me to see the voltage that the PCM thinks is there. I have a tool to communicate with the PCM from here: http://www.obddiagnostics.com but I don't think it will give me what I want to see.
I guess that the next step is to try and figure out exactly when the error is found and the trouble code is set.

stranger · Post by **stranger** » Thu Dec 20, 2007 7:33 am

did you clear memory.give it a try.remove ALL connections on pos batt post.ground pos cable.retry

blk94xlt · Post by **blk94xlt** » Thu Dec 20, 2007 3:33 pm

The PCM tool that I have allows me to read the trouble codes and clear them out too. I will try clearing all the codes and then driving it to see when the DPFE code comes up again. The problem is that I can't use the MIL light as an indicator for the DPFE code since it is lit for the codes I get relating to the automatic transmission. I used a T5 in it and have not had the automatic transmission controls deleted yet. I was trying to get this fixed first and let them tune it a little when they take care of the trans controls.

stranger · Post by **stranger** » Fri Dec 21, 2007 8:46 am

all trans codes go to od light flashing not mil light. if its mil its motor sensor related.some codes are stored and will not clear until x operation hours are timmed.
the e may not give you enough vac to operate the egr properly at low rpm
the e in an explorer pcm should be installed @ 113 icl or greater.at the stock 110 icl it looses vac

blk94xlt · Post by **blk94xlt** » Sat Dec 22, 2007 1:13 am

back when I installed the cam in the motor I took the advice from you and others and installed the adjustable timing set. I set it a 114 if memory serves (really should have wrote that down or taken pictures or something...doh). I hadn't thought about the vaccum not being sufficient. I'll try and put the vaccum gauge on it and see what it reads at idle. I'm also going to try and figure out what the conditions are that the DPFE code is set. It may not be at idle that the problem occurs.. not sure yet.