Ford F350 diesel troubles

Michael Diagnostician Holt, Michigan Posted   Latest  
Case Study
Driveability
P2073 - Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Idle

I had a 2012 Ford F350 with the 6.7 liter diesel come into the shop the other day with complaint of check engine light on. So I hook up the Ford IDS and found trouble code P2073 which is a Maf correlation code at idle. I did some research but found very limited data.

So I reached out to some other fellow techs to see if they had any information on this particular code but no luck. All I found was that the Maf should read 3.5 to 3.8 khz at idle and to unplug egr and turbocharger. My confusion was when should I be seeing that 3.5 to 3.8 was it only with them items disabled or at a regular idle. What I had was 2.5 khz at normal idle and when I disabled the egr via scan tool as the test plan instructed I could get 3.5 momentarily.

So kinda using knowledge from other experieces I wanted to ensure that the air inlet tubes to throttle body were undamaged and well secure. So I visually inspect them and find everything is in order. Next step is to inspect throttle body for any kind of obstruction and this is where I found the issue. A very badly coked up throttle body and intake. So get authorization to clean it and performed the Maf reset procedure to clear the adapts in the PCM which the Autel also offers to do in the service menu. Before the service this code would return on one test drive so after completing the service I went and drove it a couple times and the code no longer returned. Sometimes you have to rely on past experience to get you through tough times where information is limited and scan tool data is limited even on the factory tool. Hope this helps someone else down the road.

+10
David Technician
Philadelphia, Pennsylvania
David
 

Great study Mike, short, sweet and to the point without over comlicating the situation. Like you mentioned, as techs we all have previous experiences that might be applicable to what's in front of us today.

+3 Ð Bounty Awarded
Glen Owner/Technician
Arthur, Illinois
Glen
 

Ford says PPT J should be used for diagnosing P2073, PPT J7 in the PC/ED has the MAF specs and test requirements.

+1 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

Yeah I found that test but not very informative the specs they give dont clearly state if thats with them things disabled or not and not a great test plan as you cant disable all that stuff together its one at a time so not sure what they want you to accomplish as its poorly written in my opinion.

+1 Ð Bounty Awarded
Ken Diagnostician
Fortuna, California
Ken
 

After cleaning throttle body did you re check your MAF readings with and without EGR?

0 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

Yes I did just didnt record the numbers though I do remember the at idle with egr was around 2.6 khz and the non Egr numbers were around 3.6 khz or so. Which means there numbers are without turbo plugged in and egr unplugged which now I know for sure just wish to of had code setting criteria in the information.

0 Ð Bounty Awarded
Glen Owner/Technician
Arthur, Illinois
Glen
 

I don't have a 2012 6.7L in my bay at this moment but I have yet to run into where I could not control all the things that the pinpoint test states with the IDS at same time.

+1 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

I would of liked more code setting criteria mainly was my concern as there is no Tbody pid on IDS Honestly didnt try the funtions on the IDS was using Autel at that time hooked up IDS to verify data pids were correct. Now Im gonna check that next time I guess didnt realize you could do multiple bidirectional controls at once. Appreciate the input as I dont get to many of these 6.7 diesels as primarily I deal with cars and light pickups. 

+1 Ð Bounty Awarded
Glen Owner/Technician
Arthur, Illinois
Glen
 

OBDII theory & operation section has the code setting info but not sure if you can match it up with the Pid data.

+1 Ð Bounty Awarded
Mike Instructor
Fresno, California
Mike
 

You can, but I'm not sure if you can do it with an aftermarket scan tool.

0 Ð Bounty Awarded
Mike Instructor
Fresno, California
Mike
 

BTW, that info is on page 88 and 89 of the Ford OBD II System Operation Summary for the 2012 6.7L Powerstroke Diesel. (As you mentioned, Glen.)

+1 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

Oh nice wish I had access to it sounds like it would of been of big help. Gonna see what we need to have this available at the shop we have a current IDS script so maybe its as simple as adding it on.

0 Ð Bounty Awarded
Glen Owner/Technician
Arthur, Illinois
Glen
 

I just remembered the OBDII info is available under the free resources tab on the Motorcraft website.

+1 Ð Bounty Awarded
Scott Manager
Claremont, California
Scott
 

Hi Mike,

As others have mentioned, here's the link:

fordservicecontent​.​com/ford_content/c…​.​pdf

0 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

Thank you very much appreciated. Wow alot more info than my regular service info sources gonna have to remember to check here from now on. Most of the time its not a issue but these 6.7s are new to us as they are just getting out of warranty or just starting to have issues. Thanks everyone appreciate the additional information.

0 Ð Bounty Awarded
Glen Owner/Technician
Arthur, Illinois
Glen
 

It looks like the PPT J7 in Identifix does not match the OE info just in case that's what you were using.

0 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

Yeah I dont have access to the ford information system which sounds like would of been a big help. Gonna look into what it takes to get into that kind of information and see if the shop will buy it.

0 Ð Bounty Awarded
Walter Manager
Kennewick, Washington
Walter
 

Out local Ford dealer provides SI to us at no charge, sometimes all you have to do is ask, we were chatting with the Ford parts manager about AC Delco's program that provides free GM SI to independent shops, and he says, yea we have that as well. They have an allocated number that they can provide to shops at there discretion, we purchase a fair amount of powertrain components from Ford and a long standing good relationship that probably factors in as well. It is the same system the techs at the dealership have access to, great program.

fordinstallersupport​.​com

0 Ð Bounty Awarded
Mike Instructor
Fresno, California
Mike
 

You can disable them if you are using the IDS factory scan tool. Those tests (not just Ford's, but an manufacturer) are not written for aftermarket scan tooling.

0 Ð Bounty Awarded
Michael Diagnostician
Holt, Michigan
Michael
 

Yeah I should of stuck with the IDS but we share a single laptop with multiple platforms on it. Sounds like in this case would of been of assistance staying with the factory tool. Thanks for the information 

0 Ð Bounty Awarded