E4OD Hard Shifting
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Elder User
Joined: Oct 2009
Posts: 534
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From: Chesapeake
It shifts better but still hard. It gets a little better after it gets up to temp but I have only made 3 ea. 15-30 mile test runs. A guy from a transmission repair shop I spoke to asked me to come by, that my throttle pressure might need to be adjusted? But I have not been yet and I tend to avoid repair shops. Is this guy mistaken or is this something to E4ODs. Weather might be rolling in today but in the next week or so I have it in my mind to disconnect the wiring harness from the solenoid and try to clean any corrosion if present. Also does anyone have a good link for a how to on performing self tests? I intended to forget how to this after buying the reader I am waiting to get back.
Lead Driver
Joined: Jan 2019
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From: N.W. Alabama
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
It shifts better but still hard. It gets a little better after it gets up to temp but I have only made 3 ea. 15-30 mile test runs. A guy from a transmission repair shop I spoke to asked me to come by, that my throttle pressure might need to be adjusted? But I have not been yet and I tend to avoid repair shops. Is this guy mistaken or is this something to E4ODs. Weather might be rolling in today but in the next week or so I have it in my mind to disconnect the wiring harness from the solenoid and try to clean any corrosion if present. Also does anyone have a good link for a how to on performing self tests? I intended to forget how to this after buying the reader I am waiting to get back.
You can run self test with nothing more than a paper clip. https://www.troublecodes.net/ford/
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
624 is an electrical code for the Electronic Pressure Control (EPC) solenoid. It could be a bad solenoid, but most often is due to a short in the wiring between the PCM and the solenoid. This will cause harsh shifts.
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Elder User
Joined: Oct 2009
Posts: 534
Likes: 3
From: Chesapeake
Thread Starter
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Elder User
Joined: Oct 2009
Posts: 534
Likes: 3
From: Chesapeake
Maybe it’s the Jim beam talking, it’s raining, but I’m gonna need a trans go shift kit love this YouTube video
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
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Elder User
Joined: Oct 2009
Posts: 534
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From: Chesapeake
What if your last one had an internal fire and ran the fuel pumps continuously?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,732
Likes: 2,661
From: SE Florida
I didn't say it's never the cause, I said it's rare.
You can do an electrical test on the harness. Check each wire to the EPC for continuity, short to ground, and short to power. Check the solenoid for resistance.
You can do an electrical test on the harness. Check each wire to the EPC for continuity, short to ground, and short to power. Check the solenoid for resistance.
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Elder User
Joined: Oct 2009
Posts: 534
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From: Chesapeake
So with my exhaust in the way it was pretty difficult to get the epc or solenoid connector off. I pulled the whole harness because it’s raining outside right now. I buzzed each wire to the double connector. Does anyone have pin outs for the remaining connectors? Discerning wire colors is difficult. I also pulled the loom back and hand over handed the bundle looking for any breaks or areas of concern. I hope this means after I reinstall the harness, that I can do the remainder of the trouble shooting under the hood at the end of the harness instead of up on the side of the transmission.
