Can Potentiometer cause alarm?

[ericinmich]

The half slope/full slope solution is also better than one reversed (which as you said maybe being used) is that the voltage should never be the same. On the reversed slope there is a point where both values are about the same and then if one shifts, which one do you believe? In the end, these are the reasons that there are more limp homes (hopefully not walk homes) than before ETC.

A little history, there have been unattended accel on vehicles since the beginning of time (think stuck petals, cables, engine mounts failing, etc). When we all went to ETC most went to various schemes as above end ended up with systems that had about the same level of unattended accel as the old systems. One mfg didn't, and their complaints were much higher (5x if I remember) from their mechanical systems. That mfg ended up with some very high profile complaints a few years ago. I read a study that called out the likely reasons and that is due to flipping bits (yes, memory can change on it's own) and a lack of redundancy for those situations.

[IDBoating]

On the reversed slope there is a point where both values are about the same

I thought about that, but in a marine application that would be at idle (throttle lever centered) so it's actually the most benign condition. Very different in a land vehicle, where "idle" is full excursion in one direction.

[YVRGlen]

I put that new potentiometer in my boat ('06 22ve) It took less than an hour to do and I have not had a single problem since!!! Thanks for the great post and all the help. My vacation was so much more enjoyable when that horn stopped!!

[dom w. forte]

The problems we had in 2006 was mostly due to to computors on to different voltages , tach module and ecm , this caused the can network between the 2 computors to not talk , this caused code 81 , on most cars we work on today there are three pps sensors on the gas pedal and 2 tps sensors on the throttle body, we are now seeing code 81 on older boats due to the throttle bodys sticking in the bores and giving improper tps feedback versus the request by pps at shifter.