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A bad ground having a part in your troubles wouldn't surprise me at all. I've seen poor grounding cause weird stuff. Had a pickup several years ago that I had to run an extra body ground direct from the battery in addition to the factory one. Without it the right rear turn signal wouldn't work, front one worked fine, and the right headlight would dim. Run a 10ga wire from the negative side of the battery to the fender and all was fine.
I noticed I have a ground cable that is ran from the negative post on the passenger battery to the fender wall. I took that apart , cleaned it and reinstalled. Checked both large ground cables from batteries to engine block and they were clean and tight. I disconnected the icp while truck was running and didn't notice any difference. Tried plugging it back in while engine was running and the forscan icp still read 725 like it was still disconnected. Turned the truck off and restarted , icp was reading normal again but the surging came back for about minutes and eventually smoothed back out. I had the log but forgot to send the csv file to my email to save it. I then decided to read the codes again to see if anything popped up and sure enough I had more codes.
- B1483 brake on/off switch circuit
This is a new code I have not seen before,
i have searched the internet to find out about this code and there was not much info on how to diagnose. On edit: I did inspect the brake pedal switch and related wires and everything looks good.
- p1105, p1106 upper and lower generator fault codes. I've had these in the past and now they are both back. I have checked wiring and replaced lower alternator. Not sure what else to do for these codes
-P1876 transfer case 2wd solenoid
-p1832 transfer case 4x4 solenoid
these are codes that keep coming back every once and a while
I think the only codes that would pertain to my issues would be B1483, P1105, P1106. @Sous do you think the ford service manual might have any direction on what to do for these codes?
Other than that I think I am just going to replace the ICP sensor from somewhere besides Amazon being that the surging came back when I was messing with that today. Let me know what you guys think , thanks
I can pull up some wiring diagrams if you feel those are needed as you look into the DTC.
As for P1105 and P1106, this much you already knew...
I have attached the pinpoint test for the diesel engine with dual generators. There is a lot of information in there, but just take it step by step and work your way through it. Some of the steps skip to other steps based on the readings and findings. Also included in the document is inspection and verification, symptom chart and component tests. Don't overwhelm yourself by trying to digest all of the information in one sitting and trying to recall what results may have been by memory. See what you can accomplish from a fresh start.
Maybe read through and/or go through the pinpoint test while waiting for your new Motorcraft ICP to show up? I would order from Clay at Riffraff diesel or Bob at Diesel-O-Rings. Bob is in CO and Clay is in OR, so whichever is closer to you.
This is some excellent info sous! Thank you. New icp is ordered and will go through the pinpoint test. I briefly went through the pin point test and it doesn't look to bad at all. I will let you guys know what I find out
Interested to see what you find on the alternator. I did some of that troubleshooting in the link below. Ended up replacing the regulator/brush sets in both alternators. I see I have P1105 coming back though. Gonna walk through this again myself.
I have indeed bumped in a thread in some other forum,where alternator(or wiring)was reported to be the cause of surging idle..Cant remember further but pretty much every part possible were changed..It was found accidentally by removing belt or unplugging the alternator,cant remember which one..
Having a little trouble with dual alt pin out test. On page 41 which I have a pic of here, it says to test the generator circuit pin I ( ohms) and the pin 35 of the harness going to pcm. I found a schematic of the pin layout and put one test lead in pin 35 and the other test lead on circuit pin I on generator connector. I am not reading anything on the multimeter. Does this sound like I am doing this correctly? On both PCM wiring harness diagrams I have found it says that PIN number 35 is not in use. Not really sure where to go from here, any help would be great, thank you
Looking into your "connector I" question, I am not sure that is specifically what we should be trying to figure out. For example, on page 48 step AD1 mentions "C1029 I Circuit Pin". Referring back to your page 41 step AB5 says "generator connector I circuit pin". I am thinking the I is a designator of some sort because "I circuit pin" is mentioned a total of 4 times in the document.
I have seen "I circuit pin" mentioned in correlation with C1029 and C185. If needed, I can try and look those connectors up for more information. Not 100% of the connectors are in the FSM, but most are.
Looking into your "connector I" question, I am not sure that is specifically what we should be trying to figure out. For example, on page 48 step AD1 mentions "C1029 I Circuit Pin". Referring back to your page 41 step AB5 says "generator connector I circuit pin". I am thinking the I is a designator of some sort because "I circuit pin" is mentioned a total of 4 times in the document.
I have seen "I circuit pin" mentioned in correlation with C1029 and C185. If needed, I can try and look those connectors up for more information. Not 100% of the connectors are in the FSM, but most are.
I figured out the generator I circuit pin and found what I think is the right diagram for the PCM. The diagram is horizontal and in the truck the PCM connector is vertical so maybe I was reading it backwards. I will try the other side of the PCM harness connector and see what happens then
The color of the wire (WH/YE - White/Yellow) for pin 35 may help identify the correct pin location.
What was the secret to the "generator pin I circuit" that you figured out?
Keep us updated!
The pin out test before the one I posted verifies the generator pin I circuit is the the wire going in the left of the connector if you are looking straight at it and the clip is on top . Here is a pcm harness diagram that I found. It's hard to tell witch side goes up , like it is situated in the truck
If course it starts pouring now , I was getting so close. According to the pin out test it is going to boil down to 1 of these 2 things for the upper generator fault code p1105.
A) I have a bad wire going from the alternator to the pcm
B) my pcm is bad
I only have about 10 volts coming from the pcm to the alternator and I'm supposed to have 12 volts. I don't know if a bad wire would also be the cause of my lower generator fault code, it might be a bad pcm after all, we shall see The pin out tests have been a huge help
I cannot seem to get a reading on my multimeter whatsoever. Do any of you know if I need to get smaller probe pins? Has anyone else been successful probing the PCM harness? It seems like the probe should make contact with the female harness pins but I got nothing
. I then decided to read the codes again to see if anything popped up and sure enough I had more codes.
Not really sure where to go from here, any help would be great, thank you
The pin out tests have been a huge help