EGR code

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Jul 12, 2007 | 04:29 PM

c_cort

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EGR code

Alright so a month after i bought my truck the chekc engine light came on. It was for insuficent flow in the EGR system. So, i cleaned the ports the hoses, checked the wires, changed the EGR valve and the DPFE sensor with Wells parts. and come to find outnothing was fixed so i talked to a coupel people and they said to try ford parts. so i bit the bullet bought all new ford parts for and damn were they expensive and 2 days after reseting the computer it came back on. What could be the problem, I'm at a loss and I'm sure its something thats simple, i hope. so please any help is greatly apreciated

Jul 12, 2007 | 05:13 PM

Silver Streak

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From: Broken Arrow, OK

A search will give you all the info you need. This topic has been covered many times, including several recently.

Jul 13, 2007 | 09:21 AM

KingRanchMan02

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From: Louisville, Kentucky

Silver is right. Search for "+P0401". Then look for the thread with to highest post count. All you ever wanted to know about this code, FTE members woes with it, and most likely the solution to your problem. Good luck!

Jul 13, 2007 | 03:21 PM

c_cort

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I did that. All i could find was change the valves and senors and clean the ports. Is there anything else that could be causing this????????

Jul 13, 2007 | 03:57 PM

KingRanchMan02

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From: Louisville, Kentucky

Does a visual inpection of under hood vacuum lines show anything obious? Use the list below for the DPFE.

Visually inspect both pressure hoses for reversed connection at D.P.F. EGR sensor or at orifice tube assembly.
Inspect both hoses for improper routing. Hoses should not be pinched or have dips where water could settle or freeze.
Inspect both hoses for leaks and blockage.
Inspect D.P.F. EGR sensor and orifice tube assembly for blockage or damage at the pickup tubes.
Is a fault detected? Yes, correct problem.

No, CHECK D.P.F. EGR SENSOR OUTPUT BY APPLYING VACUUM WITH HAND PUMP

Disconnect pressure hoses at D.P.F. EGR sensor.
Connect a hand vacuum pump to the downstream connection at sensor (intake manifold side of sensor or the smaller diameter pickup tube.)
Key on, engine off.
Access DPFEGR PID and note PID value.
Apply 27-30 kPa (8-9 in-Hg) vacuum to the D.P.F. EGR sensor and hold for a few seconds.
Quickly release vacuum.
--The DPFEGR PID voltage must be between 0.2 and 1.3 volt with the key on and no vacuum applied.
--The DPFEGR PID voltage must increase to greater than 4.0 volts with the vacuum applied.
--The DPFEGR PID must drop to less than 1.5 volts in less than 3 seconds when vacuum is released.
Does the DPFEGR PID voltage indicate a fault in the D.P.F. EGR sensor? Yes, replace DPFE.

No, CHECK EGR VALVE FUNCTION BY APPLYING VACUUM WITH HAND PUMP

Disconnect vacuum hose at EGR valve and plug hose.
Connect a hand vacuum pump to EGR valve.
Start engine and bring to idle.
Access DPFEGR and RPM PIDs.
Slowly apply 17 to 34 kPa (5 to 10 in-Hg) of vacuum to the EGR valve and hold it for 10 seconds. If engine wants to stall, increase rpm with throttle to maintain a minimum of 800 rpm.
Look for the following:
-- EGR valve starts opening at about 5.4 kPa (1.6 in-Hg) vacuum indicated by increasing DPFEGR PID voltage.
-- DPFEGR PID voltage increasing until EGR valve is fully open. DPFEGR PID should read 2.5 volts minimum with full vacuum applied.
-- DPFEGR PID voltage steady when vacuum is held. If voltage drops within a few seconds, the EGR valve or vacuum source could be leaking.
Does the DPFEGR PID voltage indicate that the EGR valve is operating as described in this test?

No, REMOVE and INSPECT the EGR valve for signs of contamination, unusual wear, carbon deposits, binding, leaking diaphragm and other damage. If EGR valve is OK, look for an obstructed EGR port in the intake manifold. REPAIR as necessary.

Yes, INSPECT EGR VACUUM SIGNAL SUPPLY FOR INTERMITTENT FAILURE

Disconnect plugged hose at EGR valve and connect to a vacuum gauge.
Key on, engine running.
Connect a jumper wire between EGRVR circuit and ground to activate the solenoid to full on. At idle, the vacuum gauge should read above 13.5 kPa (4.0 in-Hg).
Observe vacuum gauge for an indication of a fault while performing the following:

-- Lightly tap on the EGR vacuum regulator solenoid and wiggle the EGR vacuum regulator solenoid connector, vacuum lines and vehicle harness between the solenoid and PCM. A fault is indicated by a sudden drop in vacuum reading. Is a fault indicated?
Yes
ISOLATE fault and REPAIR as necessary.
No
Unable to duplicate or identify fault at this time. (In cold climates, the EGR valve may temporarily freeze shut and thaw when the engine warms up causing the intermittent DTC.)