E4OD Shifts waaaaaay early
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Joined: Mar 2015
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From: Ankeny, IA
E4OD Shifts waaaaaay early
Good morning everyone!
I recently joined this forum because I have a new project: a 1997 F250 Heavy Duty 4x4 that needs some work. Since my google searches almost always bring me here, I decided to stop lurking and start asking directly
Symptoms: When putting the transmission in D, the truck will take off in 1 and very quickly switch to 2, then the converter locks up, then shift to 3, then to OD. When I say very quickly I mean we are all the way through the gears by say 15mph. It will kick out when the engine REALLY starts to lug but once the engine stops lugging it shifts up again. Manual shifting works fine, including the OD button. I have a check engine light that pops up occasionally, but have not been able to find a reader at any of the parts stores that will read it.
Possible causes: I'm thinking it's a transmission input, like the TPS or VSS. Have not ruled out solenoid pack or wiring harness. Could the manual position sensor cause this? The transmission "obeys" when I shift manually.
I recently joined this forum because I have a new project: a 1997 F250 Heavy Duty 4x4 that needs some work. Since my google searches almost always bring me here, I decided to stop lurking and start asking directly
Symptoms: When putting the transmission in D, the truck will take off in 1 and very quickly switch to 2, then the converter locks up, then shift to 3, then to OD. When I say very quickly I mean we are all the way through the gears by say 15mph. It will kick out when the engine REALLY starts to lug but once the engine stops lugging it shifts up again. Manual shifting works fine, including the OD button. I have a check engine light that pops up occasionally, but have not been able to find a reader at any of the parts stores that will read it.
Possible causes: I'm thinking it's a transmission input, like the TPS or VSS. Have not ruled out solenoid pack or wiring harness. Could the manual position sensor cause this? The transmission "obeys" when I shift manually.
Postmaster
Joined: Nov 2011
Posts: 3,533
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From: SW Florida
Hey there, welcome to FTE! Glad you decided to join us... you'll like it here. 
This reader will work with your truck's EEC-IV computer...
Or you can pull the codes manually with no reader at all... but you'll have to search on here for how to do that because the site I have a link to is no longer up.
Start with getting the fault codes. Most of the time they'll lead you right to the problem.
This reader will work with your truck's EEC-IV computer...
Or you can pull the codes manually with no reader at all... but you'll have to search on here for how to do that because the site I have a link to is no longer up.
Start with getting the fault codes. Most of the time they'll lead you right to the problem.
Postmaster
Joined: Aug 2005
Posts: 4,728
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From: Cleveland, TN
How to get codes without a code reader.... I've seen better, but it was just a quick search..
How-To: retrieve trouble codes- OBDI - Ford F150 Forum - Community of Ford Truck Fans
How-To: retrieve trouble codes- OBDI - Ford F150 Forum - Community of Ford Truck Fans
Frmr Ford Trans Engr
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Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Yes. My 94 spit out 3 digit codes.
Postmaster
Joined: Aug 2005
Posts: 4,728
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From: Cleveland, TN
It's either 3 digit or 2 digit codes never both on the same system, and your '97 will be 3 digit codes.
Thread Starter
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New User
Joined: Mar 2015
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From: Ankeny, IA
Listen to Mark. If you didn't happen to notice his signature, he's a former Ford transmission engineer. And don't blindly replace parts either. You need to understand that the computer CANNOT tell you what to replace or even necessarily what failed. It can only tell you what it sees that is "not normal" by way of giving you fault codes. It's up to you to determine WHY a certain condition is present.
Postmaster
Joined: Nov 2011
Posts: 3,533
Likes: 17
From: SW Florida
Manual transfer case? If so then just pull the wire off the range indicator switch. It's the only wiring that goes to the t-case, you'll see it.
Try the test again or just test from each wire to chassis ground... it should be open and if so then test the switch by shifting to 2H and probing each pin in reference to the transfer case housing. Neither wire should show continuity in 2H.
Either wire shows continuity to ground then you have a short to ground somewhere.
Transfer case switch shows continuity to the transfer case housing then the switch is bad or something broke in your t-case and is causing the switch to be actuated.
With an electric shift t-case I'm not 100% sure but I think that signal comes from the position encoder on the back of the shift motor. You can troubleshoot the same way but I can't tell you which pin is which without a schematic.
Try the test again or just test from each wire to chassis ground... it should be open and if so then test the switch by shifting to 2H and probing each pin in reference to the transfer case housing. Neither wire should show continuity in 2H.
Either wire shows continuity to ground then you have a short to ground somewhere.
Transfer case switch shows continuity to the transfer case housing then the switch is bad or something broke in your t-case and is causing the switch to be actuated.
With an electric shift t-case I'm not 100% sure but I think that signal comes from the position encoder on the back of the shift motor. You can troubleshoot the same way but I can't tell you which pin is which without a schematic.