Behmer99
New Member
- Joined
- Nov 1, 2012
- Messages
- 3
- Reaction score
- 0
- Points
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- Vehicle Year
- 1996
- Make / Model
- Ford
- Transmission
- Automatic
Hello fellow forum members -
Long time lurker that's picked up lots of useful information, but am now in need of some help.
I'm working on my 1996 Ranger with a 4.0L. It has the P0401 EGR Flow Trouble Code.
I've read countless postings on here to try and learn as much as I could. From what I could tell, I thought it was the DPFE sensor, so I picked one up and replaced it. No luck -> still get the error code.
I've started over and am walking through the steps listed here: http://easyautodiagnostics.com/ford_egr_test/ford_egr_valve_1.php
Test 1 for testing the EGR Valve seems to pass. If I apply vacuum to the Valve nipple, the truck idle's rough and the vacuum does hold (so I don't think it's a diaphram issue). Releasing vacuum and the truck idle's normally.
Test 2 - This one get's me and I've performed it on both the first DPFE and the new replacement. This is testing the DPFE EGR Flow signal. With KOEO, I get a reading of about .6 volts on the old DPFE and about .4 -.5 volts on the new DPFE. If I apply vacuum to the valve, instead of the voltage rising, the voltage drops to around .2 volts. I'm not sure what this means. I haven't gone onto test other things at this point as I'm not sure what this could mean. I've also tested the circuit itself and it's reading right around 5 volts, so I believe the wiring to be OK.
Hoping someone with some background in troubleshooting this could help me out. None of the vacuum lines appear to be damaged and all seem to be connected.
Thanks!
Long time lurker that's picked up lots of useful information, but am now in need of some help.
I'm working on my 1996 Ranger with a 4.0L. It has the P0401 EGR Flow Trouble Code.
I've read countless postings on here to try and learn as much as I could. From what I could tell, I thought it was the DPFE sensor, so I picked one up and replaced it. No luck -> still get the error code.
I've started over and am walking through the steps listed here: http://easyautodiagnostics.com/ford_egr_test/ford_egr_valve_1.php
Test 1 for testing the EGR Valve seems to pass. If I apply vacuum to the Valve nipple, the truck idle's rough and the vacuum does hold (so I don't think it's a diaphram issue). Releasing vacuum and the truck idle's normally.
Test 2 - This one get's me and I've performed it on both the first DPFE and the new replacement. This is testing the DPFE EGR Flow signal. With KOEO, I get a reading of about .6 volts on the old DPFE and about .4 -.5 volts on the new DPFE. If I apply vacuum to the valve, instead of the voltage rising, the voltage drops to around .2 volts. I'm not sure what this means. I haven't gone onto test other things at this point as I'm not sure what this could mean. I've also tested the circuit itself and it's reading right around 5 volts, so I believe the wiring to be OK.
Hoping someone with some background in troubleshooting this could help me out. None of the vacuum lines appear to be damaged and all seem to be connected.
Thanks!
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