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Discussion Starter #1
Hi all I bought an ex oil field truck for a project and I need some help with electrical problems.
It is a 2011 f350 xl std cab 6.2 auto trans , manual shift 4x4, with locker.

182 k miles.



At first it would not start and it had the symptoms that I read about with the parking brake harness issue but no problems with that harness.
The pcm relay was missing.

I then got the truck to start but the gas pedal does nothing.
It will shift into gear and move at idle but no throttle response.

It ran a little rough and I replaced the throttle body and re- learned it and it idles good now.
It will now rev to 2 k rpms in Neutral only, all other gears have no throttle response.

The gas pedal seems to be very intermittent and random.

I pulled the interior fuse box (which is also the BCM?) , disassembled it and cleaned it.

It had some minor corrosion on some pins but nothing that would indicate a problem.




Codes

p0122 throttle / pedal pos sensor A circuit low input
p0017 crankshaft position camshaft position bank 1 sensor b

p0222 throttle / pedal pos sensor B circuit low input
p0223 throttle / pedal pos sensor B circuit high input
p0430 cat effiency ( clogged it got red hot)

p0113 intake air temp sensor 1 circuit high input ( where is this located?)

p0103 mass airflow high input


Any help is greatly appreciated!


Where do I start next?



Thanks! - A
 

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The parking brake thing is related to network issues which is not what is going on here. Your codes point to a potential harness concern as they are all circuit codes with the exception of the catalyst efficiency and the cam/crank sensor position codes.

Looking at the schematic, the electronic throttle body and the MAF sensor circuits are completely isolated from each other and there are no connectors between those components and the PCM. Before getting into some voltage and continuity tests closely inspect the engine harness for damage like chafing, crushing or a section where it appears to have been opened or re-taped.

DTC P0017 with no other crankshaft or camshaft sensor codes indicates that bank 1 cam timing is off. This can be caused by a mechanical failure, the cam phasor on the gear, the actuator or low engine oil pressure. Since the camshafts are controlled by the PCM I would not diagnose this one first as a harness concern could be causing this... you had better hope so.

The intake air temperature sensor is integrated in the MAF sensor.

Hope this helps.
 

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Make sure that the throttle position sensor are hooked up. That is the sensor that tells the computer that you are giving it more gas. Also check the wires under the dash by the accelerator peddle to make sure they are hooked up as well. Don't just throw parts at it because that will get expensive fast. There are troubleshoot stuff on Youtube to show you how to test stuff.
 

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Discussion Starter #4
Thanks! I will check those items out.

What indicates a circuit problem in the OBD codes? High and Low?

The engine may have been out or replaced due to the wrench tracks on all the bolts.

If so are there certain places to check?

Grounds that could be causing problems?
 

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Also there is a connector by the emergency brake peddle that has caused some problems. Mine has been fine but some have found it lose and not making some connections.
 

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Discussion Starter #6
I have not had a chance to work on the truck more but I have more quetions.

All the wire harness jacket / black corrugated tubing are loaded with dirt and I am thinking this can create harness issues. yes no?

The brake pedal fades while sitting at idle, vacuum leak?
 

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Dirt is abrasive. I have seen chafing caused by it.

If you sit there at idle and press down on the brake pedal you may feel some additional lowering of the pedal which is normal provided it's not going to the floor.
 

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Discussion Starter #8
Thanks for the help so far. I should have time this weekend to trouble shoot more.


I have transmission questions. Mine might need replaced as it hits hard when shifted to D and a pan bolt is stripped and over size drilled.



Can a 2wd trans be used and T case bolted to it if the shaft is the same spline count and length?


Mine is a 2011 and the transmissions I see listed on ebay are listed 2012 to 2014 is there a difference that I need to be aware of?


Thanks again! -A
 
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