E4OD issues
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New User
Joined: Jul 2021
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Thanks again for your help. The truck is in Syracuse at the shop. I can't get the door code today. If the replacement ECU doesn't work. I'll know what to look for, thanks. Idk why they say it had to be flashed, if it's just plug and play.
Lead Driver
Joined: Jun 2021
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a dealership is **** where they likely wouldn’t even consider flashing a used pcm, even tho they are fully capable
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New User
Joined: Jul 2021
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I don't recommend you do that YET. Open the old one and check those capacitors first. If you choose to go ahead with the shotgun approach, buy it locally so you have a warranty and can exchange it without sending it back to someone. Different years and configurations i.e. auto/manual etc. etc.determine the correct ECM. Our 91's are the cut off year for the next generation trucks when changes were made.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
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From: SE Florida
Get Forscan from www.forscan.org. Once you have it connected you can watch vehicle speed as the PCM sees it. That should tell the story.
The vehicle speed sensor sends a signal to the PSOM (Programmable Speedometer/Odometer Module) which converts that to vehicle speed and sends it to the PCM. If the PSOM has a problem shifting is affected.
The vehicle speed sensor sends a signal to the PSOM (Programmable Speedometer/Odometer Module) which converts that to vehicle speed and sends it to the PCM. If the PSOM has a problem shifting is affected.
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New User
Joined: Jul 2021
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Get Forscan from www.forscan.org. Once you have it connected you can watch vehicle speed as the PCM sees it. That should tell the story.
The vehicle speed sensor sends a signal to the PSOM (Programmable Speedometer/Odometer Module) which converts that to vehicle speed and sends it to the PCM. If the PSOM has a problem shifting is affected.
The vehicle speed sensor sends a signal to the PSOM (Programmable Speedometer/Odometer Module) which converts that to vehicle speed and sends it to the PCM. If the PSOM has a problem shifting is affected.
Logistics Pro
Joined: Aug 2014
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Get Forscan from www.forscan.org. Once you have it connected you can watch vehicle speed as the PCM sees it. That should tell the story.
The vehicle speed sensor sends a signal to the PSOM (Programmable Speedometer/Odometer Module) which converts that to vehicle speed and sends it to the PCM. If the PSOM has a problem shifting is affected.
The vehicle speed sensor sends a signal to the PSOM (Programmable Speedometer/Odometer Module) which converts that to vehicle speed and sends it to the PCM. If the PSOM has a problem shifting is affected.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Excellent point! I totally missed that. It will not.
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Logistics Pro
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The truck has new trans, new ECM, new abs module, new speed sensor, new wiring all to and from the trans. It still won't shift smoothly, and stays in third when it comes to a stop. They say it's a wiring issue beyond their ability. It's not receiving correct signals, whatever that means. They swear they tested and checked the trans and it's not the issue. Do you know of any other components in the system that is responsible for trans
Is there a trailer hitch/trailer lights wired in the back?
I think your going to have to get comfortable reading electrical schematics, and also get a copy of the E4OD ATSG manual, there are a few trouble shooting tips in there.
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I can't thank Everyone for your help with this nightmare. Here's a curve ball. They called yesterday afternoon and told me they actually located a wire harness above the transfer case that had two more broken wires. Once they repaired those wires the truck drives and shifts as it's supposed too. I am amazed that it took 6 weeks and numerous parts to get this repaired. Once again I really appreciate all the support. I learned alot from this experience.
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