Tranny&Brake Controller
Thread Starter
|
Freshman User
Joined: Jun 2007
Posts: 31
Likes: 0
Tranny&Brake Controller
I have a 98 F 150 LAriat with a 5.4 and the E40D. I have noticed that while in O-Drive, if I slide my manual brake lever on my controller over whether the camper is attached or not, the tranny kicks out of o-drive. I originally discovered it with the camper hitched and figured the tranny was reacting to the drag I was inducing by hitting the trailer brakes. But as I said, it does it whether the camper is hitched or not. This is Ford's harness and I have a 7 and 4 pin connection/Tow package. I have put in controllers and 7 pin harnesses that were not OEM....There is nothing there to tell the tranny to down shift. Did Ford include something in their OEM harness that does this???
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
It's the BOO(Brake On Off) switch logic in the PCM. It will always unlock the torque converter when you apply the brake. I'll bet it isn't downshifting,but just unlocking the torque converter,and you're mistaking that for a downshift.
JL
JL
