• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

2011 Ranger dpfe code


shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Hey everyone I just bought my 2011 Ford ranger with the 4.0 a few months ago knowing it had a po401 code thinking it was going to be a easy fix but, I was very wrong. It came with a new, egr valve the tube for the EGR on it so I figured it had to be the dpfe sensor. So I put the new one on and also replaced the solenoid and after driving it for about 500 miles the codes still there. I cleared it, then drove it another 300 miles and the code is still coming up. I replaced all of the vacuum lines and tested the dpfe sensor and selolnoid and everything is working how it should but, still the code won't go away. Could the EGR tube be faulty even tho when I test it the truck wants to stall? How much pressure sould be going to the dpfe sensor? I have very light vacuum at idle and light positive pressure at 3000 rpm. Any help will greatly be appreciated. Thanks
 


RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,363
Reaction score
8,375
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Welcome to TRS :)

DPFE measures Exhaust pressure on its 2 hoses
One hose and fittings is larger and one smaller, it matters

They are hooked up to the EGR pipe, one is closer to the EGR valve than the other
So when the EGR valve is opened by the computer and EGR modulator(solenoid), there will be a Pressure difference between the 2 hoses
The more the EGR Valve is opened the bigger the difference

Computer has these basic/generic codes it can chose from
P0400 Exhaust Gas Recirculation Flow Malfunction
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0402 Exhaust Gas Recirculation Flow Excessive Detected
P0403 Exhaust Gas Recirculation Circuit Malfunction
P0404 Exhaust Gas Recirculation Circuit Range/Performance

It picked P0401..........Flow Insufficient
This means when the EGR is used, only after warm up and when engine is under a load(driving), the pressure difference is not going high enough

Clear the code and unplug the DPFE sensor's wires
Start and drive
Should get P0403 or P0404 "circuit" problem code pretty quickly
Sanity test for computer, shouldn't get P0401, if you do then its a computer issue

Make sure the hoses are correct, larger and smaller
 

shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Welcome to TRS :)

DPFE measures Exhaust pressure on its 2 hoses
One hose and fittings is larger and one smaller, it matters

They are hooked up to the EGR pipe, one is closer to the EGR valve than the other
So when the EGR valve is opened by the computer and EGR modulator(solenoid), there will be a Pressure difference between the 2 hoses
The more the EGR Valve is opened the bigger the difference

Computer has these basic/generic codes it can chose from
P0400 Exhaust Gas Recirculation Flow Malfunction
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
P0402 Exhaust Gas Recirculation Flow Excessive Detected
P0403 Exhaust Gas Recirculation Circuit Malfunction
P0404 Exhaust Gas Recirculation Circuit Range/Performance

It picked P0401..........Flow Insufficient
This means when the EGR is used, only after warm up and when engine is under a load(driving), the pressure difference is not going high enough

Clear the code and unplug the DPFE sensor's wires
Start and drive
Should get P0403 or P0404 "circuit" problem code pretty quickly
Sanity test for computer, shouldn't get P0401, if you do then its a computer issue

Make sure the hoses are correct, larger and smaller
Ok thanks. That helps out a lot. If it's a computer issue then do I have to go get a new one?
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,363
Reaction score
8,375
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Computer is LAST on the list, but yes, it would be replaced, but that is a very big PITA on 2004 and up Rangers because of the digital network

Since most of the parts are new, which means UNTESTED, not "working", you still need to do a few tests

Like EGR valve, get a few feet a vacuum hose that fits EGR port
Put one end on EGR valve and start engine
Suck on the other end, or use vacuum pump
Engine should start to run rough, keep sucking, see if it will stall, if so EGR can open far enough

Good PDF here that explains Ford EGR systems: http://tomco-inc.com/Tech_Tips/ttt35.pdf
Even shows the larger and smaller hoses, make sure they are correct

Computer also has these Ford specific codes
FYI, P0xxx are generic OBD2, same on Ford, GM, Audi, VW, Honda, ect......
P1xxx are maker specific, in this case these are Ford only definitions

P1400 Diff Pressure Feedback EGR Circuit Low Input
P1401 Diff Pressure Feedback EGR Circuit High Input
P1402 Exhaust Gas Recirculation Metering Orifice Restricted
P1403 Diff Pressure Feedback Sensor Hoses Reversed

P1405 Diff Pressure Feedback Sensor Upstream Hose Off/Plugged
P1406 Diff Pressure Feedback Sensor Downstream Hose Off/Plugged
P1407 Exhaust Gas Recirculation No Flow Detected
P1408 Exhaust Gas Recirculation Flow Out Of Self Test Range
P1409 EGR Vacuum Regulator Solenoid Circuit

You can use these for Sanity checks, like reversing the hoses, or unplugging one

You can check the EGR modulator(solenoid) with 9v battery, should "click" when 9v is applied, also blow thru it and make sure valve is opening
 

shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Computer is LAST on the list, but yes, it would be replaced, but that is a very big PITA on 2004 and up Rangers because of the digital network

Since most of the parts are new, which means UNTESTED, not "working", you still need to do a few tests

Like EGR valve, get a few feet a vacuum hose that fits EGR port
Put one end on EGR valve and start engine
Suck on the other end, or use vacuum pump
Engine should start to run rough, keep sucking, see if it will stall, if so EGR can open far enough

Good PDF here that explains Ford EGR systems: http://tomco-inc.com/Tech_Tips/ttt35.pdf
Even shows the larger and smaller hoses, make sure they are correct

Computer also has these Ford specific codes
FYI, P0xxx are generic OBD2, same on Ford, GM, Audi, VW, Honda, ect......
P1xxx are maker specific, in this case these are Ford only definitions

P1400 Diff Pressure Feedback EGR Circuit Low Input
P1401 Diff Pressure Feedback EGR Circuit High Input
P1402 Exhaust Gas Recirculation Metering Orifice Restricted
P1403 Diff Pressure Feedback Sensor Hoses Reversed

P1405 Diff Pressure Feedback Sensor Upstream Hose Off/Plugged
P1406 Diff Pressure Feedback Sensor Downstream Hose Off/Plugged
P1407 Exhaust Gas Recirculation No Flow Detected
P1408 Exhaust Gas Recirculation Flow Out Of Self Test Range
P1409 EGR Vacuum Regulator Solenoid Circuit

You can use these for Sanity checks, like reversing the hoses, or unplugging one

You can check the EGR modulator(solenoid) with 9v battery, should "click" when 9v is applied, also blow thru it and make sure valve is opening
Thanks. Now if everything works ok and I no longer have any codes is there some sort of driving procedure I can do to get all of the monitors ready?
 

pjtoledo

Well-Known Member
Supporting Member
U.S. Military - Veteran
Joined
Oct 5, 2007
Messages
5,442
Reaction score
3,052
Points
113
Location
Toledo Ohio
Vehicle Year
20002005199
Make / Model
Fords
Engine Size
3.0 2.3
thanks Ron, I did not know there is an orifice in the EGR tube.
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,363
Reaction score
8,375
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Last edited:

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,363
Reaction score
8,375
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Looks like a new connector was installed, double check the splices to the original wiring

2008 4.0l SOHC is the latest wiring diagram I have
DPFE's 3 wires in the lower part
 

Attachments

shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Looks like a new connector was installed, double check the splices to the original wiring

2008 4.0l SOHC is the latest wiring diagram I have
DPFE's 3 wires in the lower part
I went by the stock plug. I soldered and heat srunk the wires. I did go out and double checked the voltage. On the dpfe, Bottom wire 5v, middle is ground top wire is 1 volt at idle and a little over 4 volts when EGR opens. Is that about where I need to be?
 

shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Update: I unplugged the dpfe sensor and drove it and a po406 code came up. Then I put another new sensor on and cleared the code then drove it and got the po401 code again. So I decided to disconnect the EGR to see if I heard a big exhaust leak but I didn't. I put my finger over the end of the tube and at idle there's a little vacuum.
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,363
Reaction score
8,375
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Should be no vacuum on EGR valve's vacuum line at idle, unless its very very little but that would cause other running issues
 

shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Ok thanks. I took off the EGR tube and the inside of it looked like it's brand new. I checked for a blockage in the exhaust manifold and it seemed to be clear. Unless I burned something out of there when I heated it with the torch. Now I'm thinking maybe the EGR isn't opening because of the vacuum selolnoid.what triggers that to switch on? Again thank you for taking the time to walk me through this.
 

RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,363
Reaction score
8,375
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
The computer controls the EGR vacuum valve(solenoid)
It should have 12volts on 1 wire with key on
The other wire runs to the computer, its the ground wire for the solenoid

When the computer wants to add exhaust to intake air during driving, it will Pulse the ground wire(PWM) so solenoid opens a bit and passes limited vacuum to the EGR Valve
It then watches the Feedback from the DPFE sensor to see pressure difference so it can calculate how much exhaust is being added to the intake air
Computer can then increase Pulses for more vacuum or decrease Pulses for less vacuum, applied to EGR Valve

Computer uses similar PWM(pulse width modulation) on the ground wires for IAC Valve for idle, and EVAP valves, its a very accurate method to control DC voltage
 

shadow57x

New Member
Joined
Feb 27, 2024
Messages
9
Reaction score
2
Points
3
Location
Olean NY
Vehicle Year
2011
Make / Model
Ford ranger
Transmission
Automatic
Ok. Took it out today so far so good no codes. I just have to wait for the monitors to be ready.
 

Sponsored Ad


Sponsored Ad

Staff online

Members online

Today's birthdays

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Mudtruggy
May Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top