2001 - 4.6 liter, code is P1401. Checked EGR valve, changed EGR solenoid. Cleared the code but it has returned, found the DPFE Sensor on the driver side, has two hoses running to the bottom and a set of wires. I have located this part at the ford dealer $98.00. I have read several articles which said that I can test the solenoid based on the output voltage of .2 to .3 egine off key on.

Can someone explain to me how to test this DPFE sensor, The tech sheets I have been reading might as well have been in Greek.

I dont want to drop another $100.00 and not be sure it is going to clear my check engine light.

thanks

 

I don't know of any way to test the DPFE other than watching it's signal on a scan tool.
The DPFE is by far the most common cause of a P1401 and a P0401.
Before replacing it though you can check to make sure the EGR system is working by applying vacuum to the EGR valve with the engine idling. When you apply vacuum to it the engine should stall or almost stall. If not then you probably have plugged EGR ports in the intake manifold.

 

1. Disconnect pressure hoses at the DPFE sensor

2. Connect a hand vacuum pump to the downstream pickup mared REF on the sensor.

3. Using a multimeter, backprobe the SIG RTN circuit at the DPFE connector.

4. With the ignition ON, Signal voltage should be .2-.7 volts.

5. Apply 8-9in Hg of vacuum to the sensor. Voltage should be greater than 4 volts.

6. Quickly release the vacuum from the sensor. Voltage should drop to less than 1 volt in 3 seconds.

7. If the sensor does not respond as specified, check the power and ground circuits.

8. If power and ground circuits are functional, the sensor is faulty.


So as long as you have a vacuum pump and multimeter it should be fairly simple.

 

Thanks for that krunker
At the dealer we use the Ford manuals and they assume that we have the scan tools capable of monitoring the signals.
Typically at idle the DPFE voltage is just under 1V.

 

Racer guy, checked the EGR system last week as you said, it checked out fine.

Krunker,
Thanks for the diagnostic test, I will Identify the acronyms and follow your proceedure,

Thanks to all

 

Thanks for posting this. I must have gotten lucky because after following this procedure and disconnecting/reconnecting the battery, my Service Engine Soon light went out and has stayed out for over 500 miles now. Maybe just pulling the electrical connector and reinserting it fixed the problem? Cheaper than buying a new DP.

Thanks again.

 

I just had that sensor and both hoses replaced at my stealership for just under $300. I was having the same intermittent check engine light and code. Considering how tight my free time is at the moment, I figured the price to be a bargain.