1999 4r100 TCC issue
Thread Starter
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Tuned
Joined: Feb 2009
Posts: 426
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From: Queens, NYC
1999 4r100 TCC issue
Hi all,
Been fixing up a 99 F350, PSD auto truck. It's had an issue with not locking up in overdrive. Previous owner said trans was replaced recently (mileage wise, been sitting a few years), they were gearing up for a job that never took off so they didn't need the truck anymore. ATF was a little burnt so I did a full service with Mercon V.
Trans shifts fine, even goes into OD and seems to lock up, but then will start flashing OD light and start acting erratic. Does shift a little hard from 1-2 and 2-3 though.
Forscan gives me code 0743: TCC circuit indicated the solenoid as ON (low voltage) when requested OFF (high voltage)
I pulled the solenoid pack plug off the trans and cleaned it. There was a trace of ATF in it.
I checked the TCC wire (Violet-Yellow) for continuity from the firewall to the trans and it checks out.
I also did a temporary TC lockup switch and that worked, so I would think the torque converter is ok.
Also got the brake lights all operational, which I read can throw things off.
Where should I go next? Is there a way to test the TCC before changing it?
Thanks
Been fixing up a 99 F350, PSD auto truck. It's had an issue with not locking up in overdrive. Previous owner said trans was replaced recently (mileage wise, been sitting a few years), they were gearing up for a job that never took off so they didn't need the truck anymore. ATF was a little burnt so I did a full service with Mercon V.
Trans shifts fine, even goes into OD and seems to lock up, but then will start flashing OD light and start acting erratic. Does shift a little hard from 1-2 and 2-3 though.
Forscan gives me code 0743: TCC circuit indicated the solenoid as ON (low voltage) when requested OFF (high voltage)
I pulled the solenoid pack plug off the trans and cleaned it. There was a trace of ATF in it.
I checked the TCC wire (Violet-Yellow) for continuity from the firewall to the trans and it checks out.
I also did a temporary TC lockup switch and that worked, so I would think the torque converter is ok.
Also got the brake lights all operational, which I read can throw things off.
Where should I go next? Is there a way to test the TCC before changing it?
Thanks
Thread Starter
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Tuned
Joined: Feb 2009
Posts: 426
Likes: 0
From: Queens, NYC
To do that I would just check for continuity between the Violet-Yellow wire and ground?
Also I added to my original post that the trans shifts a little hard into 2 and 3. Not crazy hard, just harder than most 4r100s I've had.
Thanks for the input.
Also I added to my original post that the trans shifts a little hard into 2 and 3. Not crazy hard, just harder than most 4r100s I've had.
Thanks for the input.
Thread Starter
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Tuned
Joined: Feb 2009
Posts: 426
Likes: 0
From: Queens, NYC
checking for continuity I just get a little beep.
switching to resistance check I get approximately 10ohms
with the harness unplugged from the trans I get no reading.
everywhere I read had the VT-YE wire as signal wire for TCC. And it matched the pinout location I found on a ford diagram.
To verify I grounded that wire out while in drive and at a stop and it stalled the engine.
thank you
Thread Starter
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Tuned
Joined: Feb 2009
Posts: 426
Likes: 0
From: Queens, NYC
Any thoughts on this Mark?
Also, I followed what was written in this thread about disconnecting solenoid plug then starting truck:
torque converter issues 4r100/wiring - PowerStrokeArmy
For me the truck started right up and was fine in reverse and 1. Id drive it barely moved, even when giving it some throttle.
Thank you
Also, I followed what was written in this thread about disconnecting solenoid plug then starting truck:
torque converter issues 4r100/wiring - PowerStrokeArmy
For me the truck started right up and was fine in reverse and 1. Id drive it barely moved, even when giving it some throttle.
Thank you
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,722
Likes: 2,648
From: SE Florida
Any thoughts on this Mark?
Also, I followed what was written in this thread about disconnecting solenoid plug then starting truck:
torque converter issues 4r100/wiring - PowerStrokeArmy
For me the truck started right up and was fine in reverse and 1. Id drive it barely moved, even when giving it some throttle.
Thank you
Also, I followed what was written in this thread about disconnecting solenoid plug then starting truck:
torque converter issues 4r100/wiring - PowerStrokeArmy
For me the truck started right up and was fine in reverse and 1. Id drive it barely moved, even when giving it some throttle.
Thank you
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Thread Starter
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Tuned
Joined: Feb 2009
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From: Queens, NYC
Does that give you any insight as to where the problem may be?
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