Ford F350 diesel troubles

Michael from Holt Diagnostician 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.

+9

David from Philadelphia

 

Technician
 

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

Glen from Arthur

 

Owner/Technician
 

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

+1

Michael from Holt

 

Diagnostician
 

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

Ken from Fortuna

 

Diagnostician
 

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

0

Michael from Holt

 

Diagnostician
 

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

Glen from Arthur

 

Owner/Technician
 

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

Michael from Holt

 

Diagnostician
 

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

Glen from Arthur

 

Owner/Technician
 

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

+1

Mike from Fresno

 

Instructor
 

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

0

Mike from Fresno

 

Instructor
 

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

Michael from Holt

 

Diagnostician
 

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

Glen from Arthur

 

Owner/Technician
 

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

+1

Scott from Claremont

 

Manager
 

Hi Mike,

As others have mentioned, here's the link:

fordservicecontent​.​com/ford_content/cā€¦​.​pdf

0

Michael from Holt

 

Diagnostician
 

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

Glen from Arthur

 

Owner/Technician
 

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

0

Michael from Holt

 

Diagnostician
 

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

Walter from Kennewick

 

Manager
 

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

Mike from Fresno

 

Instructor
 

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

Michael from Holt

 

Diagnostician
 

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