Help me disable ignition/AT shifter interlock
Thread Starter
|
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
Help me disable ignition/AT shifter interlock
So, something went wrong with my key/ignition. When I turn the key, it unlocks the steering wheel but I can only shift between park and reverse. I suspect the electrical interlock thing.
This is a yard-only truck. I do not want to fix it. I just want to be able to shift into N and D. I imagine there is a wire somewhere that needs +12v or ground applied so the interlock will let me shift.
Help finding the wire will be appreciated.
Roy
This is a yard-only truck. I do not want to fix it. I just want to be able to shift into N and D. I imagine there is a wire somewhere that needs +12v or ground applied so the interlock will let me shift.
Help finding the wire will be appreciated.
Roy
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
What year truck? AFAIK, that's not an electrical interlock. There's an electrical interlock between the brake pedal and shifter, but the key/shifter interlock is mechanical, if memory serves.
Try this - turn the key to OFF (that's the FIRST click after putting the key in, which unlocks the column, but does not turn on the ignition). Then see what gears you can select. If you can get it into Neutral that way, try starting it in Neutral, and see if it will allow you to shift from there to Reverse and/or Drive.
Try this - turn the key to OFF (that's the FIRST click after putting the key in, which unlocks the column, but does not turn on the ignition). Then see what gears you can select. If you can get it into Neutral that way, try starting it in Neutral, and see if it will allow you to shift from there to Reverse and/or Drive.
Thread Starter
|
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
It's the truck in my signature: 1990.
The only positions I can get into, with any key position, are P and R. I wonder if the ability to shift to R is just sloppiness in the interlock system. I can't imagine a system which would allow you to only shift between P and R!
From under the truck, I can look right at what I think the problem is...it is a mechanical device attached to the shift linkage and it has wire(s) plugged into it.
Roy
The only positions I can get into, with any key position, are P and R. I wonder if the ability to shift to R is just sloppiness in the interlock system. I can't imagine a system which would allow you to only shift between P and R!
From under the truck, I can look right at what I think the problem is...it is a mechanical device attached to the shift linkage and it has wire(s) plugged into it.
Roy
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
That is the MLPS or as some call it the NS switch.
It turns on the backup lamps, lets the starter engage and lets the computer know what gear you are in.
Photos:
http://www.idmsvcs.com/2vmod/tranny/...res/index.html
/
Thread Starter
|
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
Do not think that would be your problem.
That is the MLPS or as some call it the NS switch.
It turns on the backup lamps, lets the starter engage and lets the computer know what gear you are in.
Photos:
http://www.idmsvcs.com/2vmod/tranny/...es/index.html/
That is the MLPS or as some call it the NS switch.
It turns on the backup lamps, lets the starter engage and lets the computer know what gear you are in.
Photos:
http://www.idmsvcs.com/2vmod/tranny/...es/index.html/
I could not get your pic link to work.
I still think my shifting issue is related to my broken ignition...at least, they happened at exactly the same time. I will look again for a mechanical linkage.
Roy
Posting Guru
Joined: Jul 2011
Posts: 1,219
Likes: 2
From: Elk City, OK
Try disconnecting the linkage for the shifter. It's by the firewall on the driver side. With somebody holding the brake in the cab, try putting it into gear holding the linkage with a pair of vice grips. This will isolate it and tell you if your trans isn't letting it move or the column is messed up
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Try it now.
Sorry I had a "/" on the end that made it not work.
Sorry I had a "/" on the end that made it not work.
Trending Topics
i ain't rite
Joined: Mar 2005
Posts: 65,507
Likes: 5,563
From: Marlboro Mental Hospital.
the problem is the ignition actuator in the top of the column. it usually breaks in a no strt position. but every once in a while it will also break the shifter lock tab off and this will prevent you from shifting out of park.
the only way to really fix it is to remove the steering wheel, and remove the tab.
you may be ably to wiggle the shifter and get it to break the tab, but i doubt it.
your only other option is to put a floor shifter in and bypass the ignition switch.
the only way to really fix it is to remove the steering wheel, and remove the tab.
you may be ably to wiggle the shifter and get it to break the tab, but i doubt it.
your only other option is to put a floor shifter in and bypass the ignition switch.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Lead Driver
Joined: Oct 2003
Posts: 8,476
Likes: 37
From: Madison, WI
(just sayin'....)
Thread Starter
|
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
Try disconnecting the linkage for the shifter. It's by the firewall on the driver side. With somebody holding the brake in the cab, try putting it into gear holding the linkage with a pair of vice grips. This will isolate it and tell you if your trans isn't letting it move or the column is messed up
OK, TruckGuy, your suggestion wins. I disconnected the linkage right at the tranny (I did it there, as I found it easier to access than the spot by the firewall), and the tranny shifted perfectly. I was then able to dive around the yard to the extent I wanted. This was all just to get the truck in the correct position for pulling the cab.
Seems obvious now that I have a column-related problem. I have always intended to have my rebuilt truck not use the OEM key, and to delete the locking steering wheel function. It's going to get a 5-speed, and I won't need any column shifter.
Thanks for the help, guys.
Roy
New User
Joined: Jan 2012
Posts: 3
Likes: 0
Let me add a question to this string. I have a E350 van 1993 automatic. Some weeks ago the shift tube and cover tube broke. I dropped the sterring column and put new parts in. The truck shifts just fine now except that the ignition while going to on will not actuate the starter. Did I unplug something, break something or leave something out? I don't seem to have any extra parts, this time. And a question for IRHunter on his problem. Did the shift tube break or twist within its housing? That was my first symptom before it actually broke all the way.
Thread Starter
|
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
I never got around to pulling my column. Eventually ( 1 to 16 months from now) it will come out and I will figure out how to disable the locking steering wheel system. I can only tell you what it feels like.
It feels like the part the key cylinder fits into broke where it contacts the rod, or whatever it is, that then allows the tranny to shift and the ignition switch to turn to start. The only functions which work: the wheel unlocks and the ignition switch powers up the accessories.
My guess: the tube didn't break or twist.
Roy
Thread
Thread Starter
Forum
Replies
Last Post