Odd Shifter Behavior
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Odd Shifter Behavior
Hello all,
I did some searching but I'm likely not using the correct key terms to find what I need...
Friend of mine has an early 90s RV with basically an F-series pickup cab. The shifter for his automatic transmission started acting quite odd. Basically, he can start the vehicle as normal, but he can't shift out of park. I assumed the shift tube was broken, as is common with these things, until he showed me otherwise... With the truck off, if he turns the key to accessory mode without starting it, he can shift the truck to neutral, start it, then shift to drive or reverse. When he wants to park, he turns it off, leaves it in accessory, shifts to park, then turns the key to off and removes it. Besides this, the truck operates as normal.
NSS, Ignition Cylinder, Brake Switch, Shifter Interlock? It's been a while since I've dabbled with this vintage of truck so I'm not sure what these things even have on them.
Thanks in advance!
Chris
Edit: I *think* he has the E4OD, not the AOD trans. I'm heading over there this afternoon and can get more details if necessary.
I did some searching but I'm likely not using the correct key terms to find what I need...
Friend of mine has an early 90s RV with basically an F-series pickup cab. The shifter for his automatic transmission started acting quite odd. Basically, he can start the vehicle as normal, but he can't shift out of park. I assumed the shift tube was broken, as is common with these things, until he showed me otherwise... With the truck off, if he turns the key to accessory mode without starting it, he can shift the truck to neutral, start it, then shift to drive or reverse. When he wants to park, he turns it off, leaves it in accessory, shifts to park, then turns the key to off and removes it. Besides this, the truck operates as normal.
NSS, Ignition Cylinder, Brake Switch, Shifter Interlock? It's been a while since I've dabbled with this vintage of truck so I'm not sure what these things even have on them.
Thanks in advance!
Chris
Edit: I *think* he has the E4OD, not the AOD trans. I'm heading over there this afternoon and can get more details if necessary.
Last edited by 4.9inline6; Jun 29, 2018 at 09:07 AM. Reason: Added Transmission Information
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
If it is a 1994 E350 then:
Brake-Shift Interlock Switch, Override Procedure
If the brake circuit fuse is blown or the solenoid has internally shorted, the vehicle will not shift from the park position even if the ignition is on and brake pedal is depressed. The interlock can be temporarily overridden by the following procedure:
1. Apply parking brake.
2. Remove the ignition key.
3. Insert the ignition key and rotate one position clockwise (ignition off).
4. Shift the selector lever to neutral.
NOTE:
If the vehicle is shifted into park, the above procedure must be repeated.
5. Start the vehicle.
What to check.
Possible Source(s):
No voltage signal from brake circuit.
Action(s) to Take:
Check voltage at wire terminal. If no voltage when brake is depressed, repair circuit.
Possible Source(s):
Large voltage difference between brake/ignition circuit.
Action(s) to Take:
Measure the voltage difference between ignition input and brake input -- not to exceed 2 volts. Repair circuit.
Possible Source(s):
Broken/seized solenoid.
Action(s) to Take:
Inspect latch assembly and plunger. Lubricate or replace.
Possible Source(s):
Solenoid electrically defective.
Action(s) to Take:
Replace solenoid.
/
Brake-Shift Interlock Switch, Override Procedure
If the brake circuit fuse is blown or the solenoid has internally shorted, the vehicle will not shift from the park position even if the ignition is on and brake pedal is depressed. The interlock can be temporarily overridden by the following procedure:
1. Apply parking brake.
2. Remove the ignition key.
3. Insert the ignition key and rotate one position clockwise (ignition off).
4. Shift the selector lever to neutral.
NOTE:
If the vehicle is shifted into park, the above procedure must be repeated.
5. Start the vehicle.
What to check.
Possible Source(s):
No voltage signal from brake circuit.
Action(s) to Take:
Check voltage at wire terminal. If no voltage when brake is depressed, repair circuit.
Possible Source(s):
Large voltage difference between brake/ignition circuit.
Action(s) to Take:
Measure the voltage difference between ignition input and brake input -- not to exceed 2 volts. Repair circuit.
Possible Source(s):
Broken/seized solenoid.
Action(s) to Take:
Inspect latch assembly and plunger. Lubricate or replace.
Possible Source(s):
Solenoid electrically defective.
Action(s) to Take:
Replace solenoid.
/
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He just got back to me stating it's a 2003 Class C E-450 Super Duty. I could have swore it was an early 90s. Mods, feel free to move this to the appropriate location.
That being said, the procedure you posted above, @subford, sounds almost exactly like what they had to do to continue driving it.
Thank you for your reply!
That being said, the procedure you posted above, @subford, sounds almost exactly like what they had to do to continue driving it.
Thank you for your reply!
Thread Starter
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Elder User
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I figured I'd give an update to kind of close out this thread.
I found that he had a fuse blown. After changing the fuse, everything worked as expected. I had a brake shift interlock on hand and suggested he keep it with him but he didn't want it.
So far, I haven't heard of any issues from him.
I found that he had a fuse blown. After changing the fuse, everything worked as expected. I had a brake shift interlock on hand and suggested he keep it with him but he didn't want it.
So far, I haven't heard of any issues from him.
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