Hey all, bought a tow off the lot 6.7l with 269000km. Was told it just needed EGR repaired or deleted and it would run fine but was currently stalling out.

Deleted and flashed the truck. Currently what's happening is I have a p0069 code, If I unplug just the MAP sensor, the truck runs fine but the turbo gauge is pegged at 40psi. If I unplug the just the MAF sensor and leave the map plugged in, again the truck now runs fine, but my Baro is pegged at 93kpa, and I no longer have ambient air or intake flow as the maf isn't functional now.

I have replaced the map sensor, I have pulled a 5v reference, 1.03-1.04 map with KOEO. Tested for resistance on the map sensor lines by back probing the PCM connection to the sensor harness and showed 0 resistance on the map and reference wires, but 2ohms on the signal return.

I have replaced the MAF sensor and pull the following voltages, 2.66 from IAT and MAF, whatever my battery reads is what the power reads, so 12-14.5 depending on KOEO or running.

I haven't continuity tested the MAF yet, which I will do after work today. but for now I'm looking for any guidance. Is that 2ohms resistance a big deal in the Sig return for the MAP? my kids an electrician and said it's a negligible amount. Is the next step a PCM change? just want to know before I continually throw more and more cash at this thing blindly.

thank you
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Wow…it’s raining p0069’s

i just went thru this and learned a few things…

first, in my case…the p0069 was being thrown after shut down and before the next start…so all the power on at different rpms which hunting I was doing was a waste of time.

What I found out by setting up map and aap monitors is that as soon as I shut down…my map dropped to 6 or 7, then started to creep back up to AAP….remember I said as soon as I shut down. Now…if the creep back up to aap resulted in map not hitting 12.x psi within 20 seconds…a p0069 would be set by pcm. Note that this happens on my truck after shut down and before next start.

so..something is pulling a vacuume near the map at shut down…not sure exactly by I wondered if the exhuast turbine of turbo spins for a while while at the same time the butterfly valve slams shut at shut down.. that would pull a vacuum thru the egr tube from manifold to egr valve…maybe.

so the work around in my case was to remove the oring from the map sensor…this helps the va me bleed and as a result instead of map reaching aap in more than 20 seconds map reaches aap in less than 10 seconds.

i have some more investigation to do before deciding if there are other work around that won’t generate other codes…for example…if i remove the butterfly valve and drill a small hole in it..will it help prevent the map pressure drop at shut down since the hole would help equalize the pressure…all theories right now…but I can say…ever since removing the oring…no more p0069’s.

i should note that before I discovered this after shut down map drop I replaced the IAT, map, mass air flow, and ebp located on pax side of turbo.


keep us posted.

Here’s a video of the after shut down map drop

note the map in lower left and the rpm at upper left.

as soon as I shut the motor off, map drops then climbs back up. This video is with oring on map removed.



https://youtube.com/shorts/wiJAOsAXL2o?si=tQIwooe6I2E8uzlO

 

 

so I'm thinking it's definitely a map/PCM issue does anybody have a copy of the pinpoint test for Ford p0069 codes. I just want to be sure before I spend big money on a pcm/ecm

 

why do you definitely think that?

someone posted the pinpoint test on another p0069 thread…

I would need more info before I replace the pcm ……hard part about pcm replacement is getting it programmed …I know the bin has to be put into it…but I wonder if the injector codes have to be put into and where would you get those codes from and how would you do the programming with out a dealer visit.


Interesting code for sure

 

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