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Overdrive quit

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Old 07-13-2018, 10:49 AM   #1  
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Overdrive quit

Been running a 5k ohm pentiometer in the brick for as long as I've owned it, as the P.O. didn't replace the TPS. Ran perfect, up until the other day.




After rebuilding my throttle linkage, adjusting the TV cable, to where all works as normal, I noticed the trans wasn't shifting into OD. The 518 has been pretty much no issue otherwise.



Thoughts as to what to look for ? I'm going to check the connections at the transmission, making sure no wires worked loose.




God this is gonna suck driving 3 hours with no OD.


Any ideas would be appreciated.
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Old 07-13-2018, 11:43 AM   #2  
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It's a simple circuit. Two wires at the trans. One wire is 12 volts key on, ground the other wire to energize the solenoid. A simple temporary toggle switch install will get you O/D. You just have to remember to turn it off when you slow down.
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Old 07-13-2018, 04:52 PM   #3  
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Rolled under the truck today, and found that the new kickdown cable was disconnected, and had been for at,least a few days if not more.


The new,cable end,does not,grasp the pin, and pops off. Took another, used.lever off of a spare trans, and replaced the lever. It held,for,about 10 miles, and nothing changed. I still have no 4th gear. Either,there,is,a,short,from the computer, or the valve burned out from the disconnected cable.


I don't know, as I've never studied up on how these transmission works.

EDIT:

I didn't know that there was an overdrive fuse that controlled the solenoid.


I'm checking that out now.
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Old 07-14-2018, 03:16 AM   #4  
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The kick down has nothing to do with O/D.
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Old 07-14-2018, 04:34 AM   #5  
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As previously noted, I don't know much,about,how these transmission work. I started reading,the,fsm, but time isn't,on my,side.

The fuse for the od unit checked out fine.. The of circuit is either shorted, or the solenoid gave out.


Not comfortable driving,3.5 hours to Carlisle, so ill have to delve into this at another time.


Thank you AJ


Appreciated
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Old 07-14-2018, 06:11 AM   #6  
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Tman is the speedo working? the reason I ask is mine had no od when the the plug that goes in the vss went bad
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Old 07-14-2018, 07:08 AM   #7  
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Quote:
Originally Posted by nonrev View Post
Tman is the speedo working? the reason I ask is mine had no od when the the plug that goes in the vss went bad
Yes.. Speedo works. When I can, I'm going to Jack up the back on stands, disconnect the lead wire to the od solenoid, have the wife start the truck, and get it spinning north of 35mph. If the PCM, and activation circuit is working, the plug should get 12 volts to it. I have to confirm the wiring diagrams beforehand

This will confirm if it's the od solenoid, or the circuit that activates it.which looks to be 2 sensors (coolant and distance????) that can interrupt the circuit as well
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Old 07-14-2018, 08:46 PM   #8  
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The plug will always have 12v going to it. The ground side is what triggers the OD solenoid.
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Old 07-14-2018, 10:38 PM   #9  
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Thanks!
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