Hello all,

I’m very frustrated with trying to get this problem resolved

Here’s my on-going saga:

First Some Background Info

The Vehicle:
1995 F250 XL 5.8l Automatic 4x4. It doesn’t have the original transmission, I have replaced it with same type (E4OD) 4-5 years ago.

The Ongoing Problem:
When I put the truck into Normal Drive it feels like the truck is braking as attempt to accelerate. After searching several posts having the same problem it appears to be starting out in higher gear. If I select 1st Gear manually the truck accelerates as it should and I can then manually shift up to 2nd gear fine. While in Drive it never seems to shift up or down at anytime.

Briefly the things I’ve done thus far.

Did a EOKO test and got a trouble code of 621 and a 111 Continuous Memory phase of the test. (As a quick reference - 621 = ..Solenoid Shift 1 Failure.)

Checked all of the preliminary stuff like fluid level, smell and color fluid, tested fuses, tested the relevant relays.
Replaced the wiring harness to the transmission solenoid pack
I’ve dropped the pan. Fluid was clean with no metal particles.
Replaced solenoid pack and filled with new fluid

I’ve attempted to go through wiring diagrams and the pinpoint tests but frankly find that without a breakout box the accuracy of using the pin probe and multimeter method questionable
Physically tracing the wiring while using the diagrams have been challenging because I don’t see, on the diagrams, those pass-through connectors I’m seeing as I trace the wiring up to the PCM

I’ve purchased a new MLPS but haven’t replaced it yet because it appears the most likely symptom I would be experiencing and likely codes are not ones I’m having. But after reading a TBS I’m tempted to put on anyway, having nothing to lose.

I know this lengthy but I wanted whoever might help to have some background information to save time.

I appreciate anyone that can give me some direction. It really has been a nightmare but I can say I’ve learned a lot.

Thank you.
Danny

 

No One Can Help?

 

After everything you have already done it would seem that the problem will be with the harness or the computer.

Can you locate the wire for solenoid one and trace it back to the computer? or at least bypass that wire with a new wire just to see if the condition changes. Have you checked in the passthrough connectors that you found for corrosion?

Issues like this can be very frustrating especially if you are questioning your info and tools, been there!

 

Thanks so much James for responding. That's a great idea to run a separate wire from computer to solenoid shift 1 wire on harness. Would it make sense before I connected the other end of the new wire to the harness to do a resistance test first to make sure I'm getting the right range of values? Thanks for your feedback. Yeah I'm almost ready to pull the trigger on buying a breakout box on ebay. Thanks again for helping.

 

Sure, any test before running a new wire could only help understand whats going on and you may find what you are looking for and be able to repair what you have. I am quick to run a new test wire just to see what changes if anything, but that's just what I end up doing more often.

Hope this helps

Looks like your suspect wire is pin 52 (Orange and Yellow) at the ECM and pin 3 at the tranny.

 

Hi James,

Thanks for taking the extra time to attach the diagrams and connector pic. You're awesome.

Sorry, I wasn't clear on the question about resistance testing. I've already done the testing on the existing wire but not sure if the pin probing was good enough to get good results.

I am wondering if it would make sense to do resistance testing on the new wire after connecting the one end to pcm but before attaching the other end to the wiring harness connector so I know for sure I'm getting the proper reading of resistance before attaching it to the wiring harness. Then do a second resistance test after attaching it to the wiring harness so I can verify I'm getting the same resistance at the connector end of the harness for solenoid 1.

I'm not sure if I've confused you more. Maybe my thinking of how I was going about attaching the new wire isn't correct. Can you tell me if the following is what you would do to attach this new wire?

I'm planning on cutting the orange/yellow wire going to the pcm (solenoid 1) and splicing one end of the new wire to the pcm. Then cutting the same colored wire (orange/yellow) just above the splicing of the wiring harness and attaching the other end of the new wire to it. Is this right?

Thanks so much for baring with my questions and lack of knowledge.