newer e4od weak drive/overderive light stuck
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Tuned
Joined: Nov 2007
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newer e4od weak drive/overderive light stuck
I have a 1990 ford superduty that had a newer(2 yr old rebuilt) that drove fine in the morning with no issues.
I went to drive it in the afternoon and the drive gear wasn't there(weak) but have all other gears. and the overdrive off light is stuck on.I checked every fuse and they are all good, fluid is full and clean with no burnt smell. Replaced the shift switch on t he side of the tranny as it was under warranty still. But still the same problems.
the only code I was getting was a 26 and 10 with the scanner.
Any ideas of what it could be?
I went to drive it in the afternoon and the drive gear wasn't there(weak) but have all other gears. and the overdrive off light is stuck on.I checked every fuse and they are all good, fluid is full and clean with no burnt smell. Replaced the shift switch on t he side of the tranny as it was under warranty still. But still the same problems.
the only code I was getting was a 26 and 10 with the scanner.
Any ideas of what it could be?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
What do you mean by all other gears? 1? 2? 3? 4? Reverse? Does the transmission shift as you accelerate?
Usually, that means that the computer isn't getting powered. If that is the case the transmission will always be in fourth gear, and that's really slow from a standing start. The most frequent cause of this is a bad EEC-IV power relay.
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Tuned
Joined: Nov 2007
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When I try to take off in drive it is very sluggish and you have to review the motor way up in order for it to move. But in 2nd or 1st it reverse it moves with no problem. And I swapped out the overdrive switch on the dash to see if I could get the light to turn off but had no luck as it is stuck on still.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
Your problem is that the computer isn't powering up. Usually that means the EEC power relay that supplies power to the computer has failed. I don't know it's exact location, it is somewhere under the hood.
Laughing Gas
Joined: Feb 2015
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Tuned
Joined: Nov 2007
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I went ahead and swapped out the brown/black relay under the hood and got the overdrive light to shut off but it doesnt turn back on at all and the tranny still has no power in the drive gear.
The truck a 7.3 idi by the way
The truck a 7.3 idi by the way
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
You need to see if there is +12 volts on the red wires at the PCM connector. I think those are pins 37 and 57, but it has been years decades since I used those pin numbers, so I could be wrong.
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