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Can't clear 0403 code

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Old 08-31-2013, 12:41 PM
Ken05 Ken05 is offline
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Can't clear 0403 code

My truck recently started throwing up the 0403 code. Double checked my SG2 by clearing it and it shows 4 codes all 0403. Pulled the Egr and it had a fair amount of dry soot on it so I cleaned it and tried again. 0403 still shows up
What is causing multiple (4) 0403 codes. When I cycle thru the code numbers for a brief second it will read 0405 before instantly switching to 0403.
Oil and water temps mirror each other with a few degrees of separation when the trucks been on the road for a while. What am I missing to clear this code or is there something more I need to look into
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Old 08-31-2013, 02:23 PM
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You either have a faulty valve or circuit. 0403 and 0405 are both circuit "A" codes.
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Old 08-31-2013, 03:33 PM
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How would I fix the circuit problem I do know anything about tracking that down.
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Old 08-31-2013, 03:42 PM
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Broken and/or wires that are chafing.
A bad plug can also be a problem.
Time to start chasing wires. Look at each
wire and the harness that it comes from.
clear damage is the easy one. It's the hidden
stuff that will drive you crazy. Feel the wire for
crispy or spongy spots and check there.


Sean
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Old 08-31-2013, 03:45 PM
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Its an electrical Problem with the EGR Valve or EGR Electrical Circuit

Have A DVM??

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Old 08-31-2013, 05:13 PM
Ken05 Ken05 is offline
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Ok I'm following you now with the circuit , does the egr itself fail or is this just an electrical / plug issue.
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Old 08-31-2013, 06:11 PM
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Quote:
Originally Posted by Ken05 View Post
Ok I'm following you now with the circuit , does the egr itself fail or is this just an electrical / plug issue.

Most common I believe would be the EGR Valve itself failing

Affter that would be wire Harness

P0403 EGR Exhaust Gas Recirculation Control Circuit Open circuit, short to ground or voltage, EGR valve


You can take the DVM and Back Probe the EGR Valve Plug

Here is A WIre diagram
https://www.ford-trucks.com/ford-man...%20diagram.pdf



Check for the following with engine Running

Vehicle Power 12 volts @ PIN#E
V-REF 5 Volts @ PIN# D
Signal Circuit @ PIN# C
Ground Circuit @ PIN#B
Signal Circuit @ PIN# A

If it don't have all the Circuits working correctly we can get you the PCM Pinout to chase it that way
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Old 08-31-2013, 08:29 PM
Ken05 Ken05 is offline
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Thanks very much that will really help
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Old 09-01-2013, 10:50 AM
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p0405 is more then often a valve
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Old 09-01-2013, 02:39 PM
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So I replaced the EgR no luck ,metered the plug and and found the following values
Red- 16.6
Brown- 6.0
Grey w/ orange stripe 0
Grey w/red stripe .06
White .01
What should I do next I'm surprised by the first value since its supposed to be 12 but what does it mean and what should I do next
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Old 09-01-2013, 03:23 PM
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IPR how did we get to that I thought this was an EGR issue.

Sean
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Old 09-01-2013, 03:44 PM
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Originally Posted by Yahiko View Post
IPR how did we get to that I thought this was an EGR issue.

Sean
Oops EGR to much reading diagrams
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Old 09-01-2013, 04:12 PM
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That's ok. I thought that may of been what happened.
We have alphabet soup with all the acronyms.

Sean
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Old 09-01-2013, 09:23 PM
Ken05 Ken05 is offline
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Found the pinpoint test info it looks as if I'm looking for a short to ground or possible a bad PCM.
Wiring is my least favorite thing to do , I'm confused by the language in the diagnostic procedure. I'm kind of guessing at the terminology is what's im assuming below correct
Component side- the egr sensor pins
Harness side - the plug

A little background to how the problem started- I unplugged the Egr and was going to pull it during routine maitenance. Forgot to plug it back in and about a month went bye. Discovered it when I ran a code check and discovered my mistake and pulled the Egr ( grabed the wrong can and cleaned it with brake fluid. Figured I had ruined it so I purchased a new one from advance and installed it. I'm still reading 4 immediate codes all the same a previously posted.
Seems kind of random to Delevop a short but I guess they usally are and I should run through the pinpoint tests and see we're it leads. Anything obvious jump out at anyone I'm missing.
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Old 09-01-2013, 11:45 PM
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Quote:
Originally Posted by Ken05 View Post
So I replaced the EgR no luck ,metered the plug and and found the following values
Red- 16.6
Brown- 6.0
Grey w/ orange stripe 0
Grey w/red stripe .06
White .01
What should I do next I'm surprised by the first value since its supposed to be 12 but what does it mean and what should I do next

Could be the Ground Issue
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