Brake Pedal Pressure, Overdrive Function
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Brake Pedal Pressure, Overdrive Function
2002 Excursion Limited, 7.3 PSD, 170K, Bully Dog Tuner
Can anyone explain the relationship, components, switches, etc involved between applying pressure to the brake pedal and the Overdrive turning on/off. I replaced the switch on the brake master cylinder and it made no difference.
My problem is this. I turn the key to On and while I am applying firm pressure to the brake pedal, I can press the O/D switch and the Off lights up, press it again and it goes off, but this Only works when there is firm pressure on the brake pedal. Doesn't mater if the engine is running or not. Now, that's the situation when I am not in motion. When driving down the road, a firm press on the brake will flip the Overdrive to opposite whatever it is. Previously I have sent this PCM in for diagnosis / repair if necessary, and the PCM checked out good.
Can anyone explain the relationship, components, switches, etc involved between applying pressure to the brake pedal and the Overdrive turning on/off. I replaced the switch on the brake master cylinder and it made no difference.
My problem is this. I turn the key to On and while I am applying firm pressure to the brake pedal, I can press the O/D switch and the Off lights up, press it again and it goes off, but this Only works when there is firm pressure on the brake pedal. Doesn't mater if the engine is running or not. Now, that's the situation when I am not in motion. When driving down the road, a firm press on the brake will flip the Overdrive to opposite whatever it is. Previously I have sent this PCM in for diagnosis / repair if necessary, and the PCM checked out good.
Lead Driver
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
there is no function that override OD via the brake pedal, i suspect you have the common OD short that is somehow happening when you are braking,
the short is in the column, i think the fix is documented in the tech section
the short is in the column, i think the fix is documented in the tech section
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