Fly by wire help
11-05-2013, 08:01 PM
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Fly by wire help I'm not sure if this in the right section but I'm having a small issue. If I put the pedal to the floor, engine immediately goes to idle, no response from gas pedal, and a code is thrown ( I have not checked the code yet and I realize that is important) so my question is: Can a fly by wire pedal go past full throttle? Meaning, I'm guessing that the pedal works by some sort of ohm/voltage reading based on the pedal position. If the pedal goes past the computers known range or past full throttle, could that cause the limp mode issue. It runs like a raped ape up to full throttle and there is no sputtering or hesitation, it's instant so it's not a fuel issue or anything like that. Once I turn the key off take it out, reinsert and start up it's fine again and the fault light eventually turns off. Thoughts or possible fixes? I'm workin on gettin the code read but truck is down for the moment. Thanks 
Sam
Sam
11-05-2013, 08:14 PM
#2
You didn't say if this is a stock vehicle or a stock one.
If it is an engine swap, the engine, pedal and computer all need to match, best if all from the same vehicle. You can't mix that **** up. It ain't 1955 anymore.
Had a customer once call me. He had put a Corvette throttle body on his Drive By Wire pickup. It did just what you described here.
This stuff also sometimes just fails on stock DBW vehicles. GM uses it for torque management and traction control. I don't like it myself.
If it is an engine swap, the engine, pedal and computer all need to match, best if all from the same vehicle. You can't mix that **** up. It ain't 1955 anymore.
Had a customer once call me. He had put a Corvette throttle body on his Drive By Wire pickup. It did just what you described here.
This stuff also sometimes just fails on stock DBW vehicles. GM uses it for torque management and traction control. I don't like it myself.
12-25-2013, 08:38 PM
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Just in case anyone else has had this problem me and a friend figured it out. He had a spare truck tb laying around so we unplugged mine and just plugged the spare one in. Pedal opened and closed the tb normally but if you floored it, tb immediately shut and no response from pedal, same thing that had been happening. Hooked up the scan tool and found that the pedal was going past full throttle. After reading 99.6% throttle, the pedal would still travel about another full inch sending computer into limp mode. Unbolted the pedal from firewall, drilled a hole, spot welded a nut to the back of it and used a large hex head as an adjustable throttle stop setting it to stop the pedal arm at 99.8% throttle. You can mash the pedal as hard as you want and no issues now. Hope this helps anyone else that may have had the prob.
