Another E4OD thread.. Need help - Diesel Forum

EMD_Driver · 08-25-2008, 08:26 PM

Hello again all,
I picked up a 93 F250 7.3NA this weekend and need some advice on the tranny. I did a thread search, but could not find what I was looking for..

Once in a while, when I start the truck, the tach will bottom-out at idle, but works when the accelerator is pushed.

Whenever I put the thing in drive, it will take off in 3rd.. I have to manually pull the shifter down, to get 1st. When upshifting, I never feel 2nd gear at all (I may be starting in 2nd.. I don't know..) My other truck has a C6 in it, so I have no reference on what speed=RPM's should be. At 70MPH, I'm pushing 2,500RPM's.

Also, the O/D light on the shifter has never come on and pushing the button does nothing. I also never feel the TC locking.

Does any of this sound familiar?

Thanks
Gary

Mark Kovalsky · 08-25-2008, 08:34 PM

The transmission controller is not getting power. There is a relay that feeds power to the module, chances are it's dead. I don't know where it's located, but someone will probably be along with that tidbit of info.

EMD_Driver · 08-25-2008, 08:44 PM

Quote:

Originally Posted by Mark Kovalsky

The transmission controller is not getting power. There is a relay that feeds power to the module, chances are it's dead. I don't know where it's located, but someone will probably be along with that tidbit of info.

That would make sense! I'll have to check, to see if it's fused, or just a dead relay...

That would be sweet, if it were only a simple electrical problem!

Thanks Mark!

Gary

cdnsarguy · 08-25-2008, 10:19 PM

In the engine compartment fuse box the teca relay.....look under the lid for a schematic.

rsr911 · 08-26-2008, 12:43 AM

Had this problem on my 91 van. Turned out to be a ground wire connector attached to the passenger side battery. Has about 10-12 gauge black wire and a single pin connector about 8" from the battery. It must have been a problem in the past as someone had put electrical tape on it to keep the connector together.

EMD_Driver · 08-26-2008, 08:21 PM

Quote:

Originally Posted by rsr911

Had this problem on my 91 van. Turned out to be a ground wire connector attached to the passenger side battery. Has about 10-12 gauge black wire and a single pin connector about 8" from the battery. It must have been a problem in the past as someone had put electrical tape on it to keep the connector together.

I looked, but there's nothing resembling that under my hood..

Gary

EMD_Driver · 08-28-2008, 08:36 PM

Ok... Found out how to read the codes without a reader and got the following:

56- TOT reads -40 degrees Fahrenheit, or circuit open.

23- TPS out of self-test range

91- Shift solenoid 1 circuit failure.

92- Shift solenoid 2 circuit failure.

93- Coast clutch solenoid circuit failure.

94- Converter clutch solenoid circuit failure.

99- Electronic pressure control circuit failure.

With all these codes, it sure sounds like there's a broken wire(s) somewhere...

I checked the connectors on the transmission, and they both looked good. Also checked the TECA relay and it is working.

Gary

Mark Kovalsky · 08-29-2008, 07:56 AM

The TECA relay is working or you wouldn't get any codes.

You can ignore the 23 code if you didn't hold the go pedal on the floor when you ran the test.

All of the other codes have one thing in common - all of those circuits go throught the big eelctrical connector on the passenger's side of the trans. Open that connector and look for green corrosion. I'll bet it's full of it.

EMD_Driver · 08-29-2008, 04:20 PM

Hey there Mark,
When I pulled that connector off, there was a little dirt and some water in it. No green stuff to be found... Could you tell me where the other end of that cluster of wires comes out? I'd like to run a continuity check on each of those wires.

Is it possible that the entire solenoid pack itself is just toast?

Gary

Mark Kovalsky · 08-29-2008, 08:09 PM

I check them back to the TCM. It's possible that the solenoid body is bad, but that seems a bit unlikely.

EMD_Driver · 08-29-2008, 08:16 PM

I will do that as soon as I can. This pneumonia is whipping my hind-end! Are the wires going up from there easy to trace? I haven't had a chance to look yet...

Gary

EMD_Driver · 08-30-2008, 05:32 PM

I traced the wires from the solenoid pack, all the way to the fuse box under the hood and found no obvious damage. Also found no breaks in the wire. I'm figuring that my next course of action, is to drop the pan and solenoid pack and check for continuity on both sides of the connector.

Since I'm going to have the pan off anyway, I am going to replace the filter. Is there anything else that I can/should do, while I have the pan off?

Gary