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P0478 Question after cleaning tube and new Motorcraft EBPS sensor replacement from RiffRaff.
QUICK side note: I’m running Jelli tunes on Hydra, EBPV delete and Pedestal delete. KOEO map, Baro and EBPS all read around 14.
Question is even after replacing sensor and cleaning tube, I keep getting P0478 as mainly a soft code but sometimes shows up as a hard Cade with CEL on. Is this related to the tuner?
According to a quick google-foo search, the code your experiencing is related to the EBP Valve. So this may not be directly related to your EBPS. I’m no code expert so take this for what it’s worth.
Google info
”abnormally high voltage reading from the exhaust system back pressure control valve circuit”
Since your pedestal has been deleted do you have a code eliminator? But the search also says it is for high voltage. How about a short in the EBPV wiring?
EBPS pigtail, perhaps? That seems unlikely to cause a high voltage reading, but I suppose it could.
Has it existed since you tuned the truck? It may be that the tuner needs to turn the code off.
Others will be along shortly...
Mark
Yeah, talking to Clay he doesn’t think it’s the pigtail either since the reading is good and matches Baro/ MAP.
The code only recently started showing up after the pedestal delete. I did add RiffRaff‘s EBP delete isolator pigtail. I’m running a GTP38R with RiffRaff Wheel. New Alliant AC code injectors with Adrenaline HPOP.
First is P0478 correlate to fuel mileage or just an annoyance code?
Second following the DE 17 procedure how do I view KH5?
Third I have some questions and comments in line below:
Possible causes:
n stuck EBP butterfly valve - I have the non butterfly valve pipe so this is not the problem.
n restricted exhaust - Whats the best way to test this?
n plugged EBP sensor line - is this the red and green line going to the waste gate?
n misadjusted EPR linkage - mines deleted so this is not it
n F-Series wastegate turbo may be overboosting - I have the turbo smart wastgate from RiffRaff set at the firm spring. This might be it. I also have a persistent soft P1249 but Brian from Jelibuilt tunes says that is expected with his running.
Did your MPG go down? If the EBPV is stuck closed that will reduce MPGs and your exhaust would sound like a jet.
P0478 will throw a code. List of factors tossing this are: plugged sensor line, stuck butterfly valve, restricted exhaust.
I'd push the clip that retains the EBPV valve onto the EBPV actuator rod, then pull rod off the valve. Manually push the EBPV valve thru it's motion, looking for binding.
Did your MPG go down? If the EBPV is stuck closed that will reduce MPGs and your exhaust would sound like a jet.
P0478 will throw a code. List of factors tossing this are: plugged sensor line, stuck butterfly valve, restricted exhaust.
I'd push the clip that retains the EBPV valve onto the EBPV actuator rod, then pull rod off the valve. Manually push the EBPV valve thru it's motion, looking for binding.
I deleted my EBPV pedestal, and butterfly valve. I’ll have to check the sensor line but recently had it apart and cleaned it as with putting a new Motorcraft sensor on.
Yup got one already installed. See my earlier reply above:
“The code only recently started showing up after the pedestal delete. I did add RiffRaff‘s EBP delete isolator pigtail. I’m running a GTP38R with RiffRaff Wheel. New Alliant AC code injectors with Adrenaline HPOP.”
I cleaned the EBPS tube and sensor this morning and cleaned the sensor out. It was not plugged up at all but for sure really dirty and even a little oily in the tube itself. Is that normal? I do not have the CCV going to the ground like most and it’s still stock going into the intake. So maybe it’s from the oily mist coming from the CCV?
I’ll put another 100 miles on it and see if the P0478 comes back.
It is normal for the EBPS to be dirty and even clogged when it is in need of service or replacement.
You can verify the EBPS is functioning properly using your scan tool on a cold engine. The EBP, MAP and Baro should all read within .5 PSI of each other. The one that is different than the others is or has failed.
It is normal for the EBPS to be dirty and even clogged when it is in need of service or replacement.
You can verify the EBPS is functioning properly using your scan tool on a cold engine. The EBP, MAP and Baro should all read within .5 PSI of each other. The one that is different than the others is or has failed.
what’s the Baro sensor on Torque Pro? I think mine all read correctly see the picture. However the sensor called Barometric Preasure (from vehicle) does not show anything. Is Intake pressure the same as Baro for Ford?
I despise TorquePro and cannot offer any help in person or on this forum.
Baro is barometric pressure in which the sensor is internal to the PCM on your 2003.
I would say the same as you in that your EBPS is functioning properly as it is within .1 of MAP. This is a good thing because your cleaning method worked. You are more fortunate than I was as I needed to replace my EBPS, even after a rigorous cleaning session.
