tranny help!
Thread Starter
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Senior User
Joined: Jul 2009
Posts: 102
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From: Bozeman, Montana
tranny help!
hey everyone, havent been around for a while. Just bought a new truck two days ago, and really thinking that the e4od is shot. Sold my 86 6.9 and got a 1990 f250 7.3l idi with aftermarket ats turbo kit.
The tranny cooler return line was leaking when i picked it up and wouldnt shift out of 2nd. I got it home and patched the leak with an inline filter, filled with atf and still same problem. any ideas? My next step is to pull the pan and change filter and fluid, thinking that the filter itself is plugged. oh, the truck was sitting in a pasture for over a year with next to no atf in it. Bands dried out?
I'm hoping there is an easy cure. thanks.
The tranny cooler return line was leaking when i picked it up and wouldnt shift out of 2nd. I got it home and patched the leak with an inline filter, filled with atf and still same problem. any ideas? My next step is to pull the pan and change filter and fluid, thinking that the filter itself is plugged. oh, the truck was sitting in a pasture for over a year with next to no atf in it. Bands dried out?
I'm hoping there is an easy cure. thanks.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Try running the truck on blocks with no load to see if the transmission is even trying to produce 2nd gear. Doing this is also less likely to cause damage if something is more seriously wrong in there.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Just had a quick look at my info and it could also be failed shift solenoid #2. That solenoid is required for 2nd and 3rd gear. 1st and 4th do not require it.
Since you mention its been sitting for a long time out in the elements, it could be corrosion at the bulkhead connector on the passenger side of the transmission behind the heat shield. All electrical power for all the solenoids of the transmission flow through that connector including both shift solenoids.
Be careful when pulling that connector because its quite possibly the worst design of all time and very easy to break. There is a center thumb tab that needs to be pressed in (sideways relative to the truck) while pulling up on the wires. If you are lucky it will pop out without too much fuss.
Since you mention its been sitting for a long time out in the elements, it could be corrosion at the bulkhead connector on the passenger side of the transmission behind the heat shield. All electrical power for all the solenoids of the transmission flow through that connector including both shift solenoids.
Be careful when pulling that connector because its quite possibly the worst design of all time and very easy to break. There is a center thumb tab that needs to be pressed in (sideways relative to the truck) while pulling up on the wires. If you are lucky it will pop out without too much fuss.
Thread Starter
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Senior User
Joined: Jul 2009
Posts: 102
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From: Bozeman, Montana
thanks. i did quite a bit of footwork in the last couple of days and i came up with some ecouraging news. Talked to a tranny expert in billings and he came up with the idea of uplugging the main plug on passenger side, and seeing how it drives. he said that fords' default gear is 4th; if it tries to take off in 4th, the internal parts of the tranny are most likely good.
I did the test, sure enough, it does take off in 4th. however, because the eletrical is not plugged in, it will not go into 4th lockup. he pointed me in the direction of the neutral saftey/shift switch on drivers side of the trans. sound like a good place to start? he gave me a motorcraft part # sw5978.
talked to a local ford guy today and he suspects the tps. any ideas? i think that i'm off to a good start in thinking that the tranny guts are okay.
after i unplugged the harness, the truck threw a bunch of codes: 56,91, 92 93 94 99, ect.
anything else thats common? thanks.
I did the test, sure enough, it does take off in 4th. however, because the eletrical is not plugged in, it will not go into 4th lockup. he pointed me in the direction of the neutral saftey/shift switch on drivers side of the trans. sound like a good place to start? he gave me a motorcraft part # sw5978.
talked to a local ford guy today and he suspects the tps. any ideas? i think that i'm off to a good start in thinking that the tranny guts are okay.
after i unplugged the harness, the truck threw a bunch of codes: 56,91, 92 93 94 99, ect.
anything else thats common? thanks.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
You might have found your problem (problems?)
Here's what my manual has to say about your codes:
56 = Transmission oil temperature sensor out of range, open circuit indicating temperature of -40
91 = Shift solenoid 1 Circuit failure: Soleniod 1 fails to provide voltage drop across solenoid. Open circuit or shorted or EEC driver failure (EEC failure isn't very likely if its still able to produce 1st gear)
92 = Shift solenoid 2 Circuit failure: Soleniod 2 fails to provide voltage drop across solenoid. Open circuit or shorted or EEC driver failure
93 = CCS Solenoid Circuit failure: Solenoid 4 (coast clutch solenoid) fails to provide voltage drop across solenoid. Circuit open or shorted, or EEC driver failure.
94 = CCC Solenoid Circuit failure: Solenoid 3 (converter clutch solenoid) fails to provide voltage drop across solenoid. Circuit open or shorted, or EEC driver failure.
99 = EPC Solenoid Circuit failure/short: Voltage measured across the electronic pressure control solenoid is less than the calculated minimum voltage.
No mention in there about the neutral safety switch (better known as the MLPS or manual lever position sensor since it also feeds info to the transmission controller in addition to being a neutral safety switch and backup lamp switch), or the throttle position sensor.
Its more than likely something wrong with the solenoid body or the wires that feed into it. EEC driver is mentioned in there too but I would inspect that harness connector for corrosion, oil or broken wires before replacing the transmission controller (or the solenoid body for that matter).
Here's what my manual has to say about your codes:
56 = Transmission oil temperature sensor out of range, open circuit indicating temperature of -40
91 = Shift solenoid 1 Circuit failure: Soleniod 1 fails to provide voltage drop across solenoid. Open circuit or shorted or EEC driver failure (EEC failure isn't very likely if its still able to produce 1st gear)
92 = Shift solenoid 2 Circuit failure: Soleniod 2 fails to provide voltage drop across solenoid. Open circuit or shorted or EEC driver failure
93 = CCS Solenoid Circuit failure: Solenoid 4 (coast clutch solenoid) fails to provide voltage drop across solenoid. Circuit open or shorted, or EEC driver failure.
94 = CCC Solenoid Circuit failure: Solenoid 3 (converter clutch solenoid) fails to provide voltage drop across solenoid. Circuit open or shorted, or EEC driver failure.
99 = EPC Solenoid Circuit failure/short: Voltage measured across the electronic pressure control solenoid is less than the calculated minimum voltage.
No mention in there about the neutral safety switch (better known as the MLPS or manual lever position sensor since it also feeds info to the transmission controller in addition to being a neutral safety switch and backup lamp switch), or the throttle position sensor.
Its more than likely something wrong with the solenoid body or the wires that feed into it. EEC driver is mentioned in there too but I would inspect that harness connector for corrosion, oil or broken wires before replacing the transmission controller (or the solenoid body for that matter).
