I replaced the ignition switch initially but I never checked the bcm or pcm, i will check the wiring issues I have no problem with the truck starting everytime and such. The main thing I am trying to figure out is that idle issue and stalling while at stop or rough idle at stop that comes and goes. Is there a way I need to look for forscan to figure out that what the problem is so I can fix it ?

 

Many intermittent issues are bad grounds. There are many different grounds but I would concentrate on the following:

• Just next to the PCM on the firewall or cowl there should be one or two ground posts. These provide all the grounds for the sensors that provide info to the PCM
• Just to the aft of the BCM there is a ground which grounds many of the circuits originating from the BCM. You will need to remove the passenger scuff plate and kick panel to get at that ground.

Some owners have had problems with water intrusion into the BCM due to problems with replacement windows not being sealed properly or factory body seals failing to prevent water leakage. /check the BCM for water intrusion.

Good luck.

 

Thank you I’ll check that . that probably for error codes but what about the stalling issue at at stop or rough idling at the stop. What can cause this? I replaced so many parts and even got forscan and I still can’t figure out what I am looking for on forscan to figure out that stalling idle issue

 

Glad to see you got Forscan up & running. In the future you can save the PID traces to a file & post here. Makes it much easier. There is a save ICON at the bottom of the page.
I understand the conditions for the first pic “full stop at idle” and the T_DIFx PID’s look good. The other 3 pic’s things are not looking so good but what were the conditions?
Also, what were the top 4 trace PID’s?
Anyway, you’ll need to look at all the VCT pids for intake & exhaust, banks 1 & 2.
Why all the module errors?
Sorry I didn't get back sooner - didn't get the usual notification.

 

I really appreciate you helping me with this. On forscan when I go to the diagram what do I choose ? What you mean by pids? Sorry I am still learning forscan as it’s my first time using it. The error codes I think related to the right side of the steering wheel buttons not working but the rest I am not sure maybe there is a shirt somewhere. Someone suggested checking some negative cables which I will do , even tho the rest of the error codes are there the truck runs fine the only problem is the idle issue where is stall or rough idle and die at a stop which happen sometimes . Also what you mean what are the conditions ? I am trying to find what to look for to give you an answer

 

If you haven’t already found it this is the Forscan documentation: Forscan Documentation
Parameter IDs or PIDs are described here: OBD-II PIDs
Forscan allows you to pick them from a table to setup the oscilloscope as you found out.

There is something wrong having all those module errors. Try hooking up the cable, run Forscan, then turn the ignition on - do not start the vehicle. Now hit the connect ICON. It should read all those modules without those errors. If you still have problems try clearing all the DTC then re-read.

When using the oscilloscope to monitor PIDs Ford provides typical values that should be observed under various conditions. See the attached xls sheet.
It's usually good enough to just look at the "Hot Idle" in Park and Drive. So your first picture looks pretty good, but the other 3 are all over the place. Were these all made at Hot Idle?
Also, you need to look at all the VCT PID's for Intake and Exhaust. I can't remember if Forscan uses the exact terminology as Ford but I'm sure you can figure it out.
It only takes one of them to make it stall.

You need to get all these module errors figured out first.

When you clear all the DTC's it take the PCM some driving time before it will throw a VCT related code. The PCM has a large tolerance before the check engine light comes on but it will throw a pending code if there is a problem. You will see this in the oscilloscope PID's if there is a problem.

 

I got logs for hot idle, hot idle when it stalled and 30MPH and 55 MPH but the stupid thing telling me i cant upload them becuase they are forscan data steam and not supported to load them. how can i upload them here?

and yes those all 4 previous pics were at hot idle. the last 3 when it was stalling

 

Sorry about that, sometimes my memory goes out to lunch. What I did was saved them as you say to a log file, then later reloaded them & used the windows snipping tool to create a jpg.

Also, did you clear-up the module errors?

 

Oh got it I’ll take some pics then

and yes I cleared the modules like you told me and the only ones that showed up again are nothing pcm like the right side of steering wheel buttons don’t work and 1 of my tpms sensor is out which I know about all of them , but I’ll take some pics and upload them shortly

 

this is the hot idle

this one is driving 30MPH

this one driving 55MPH

this one hot idle on a stop, the truck started to drop the rpm and rough idling on its own for few seconds then goes back to normal

this one is also hot idle also shows stalling and rough idling