TPS sensor gone bad?

chuckie108
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chuckie108
Recently purchased an '04 CRF450 that I'm going to dual sport. The carb was pretty gummed up so I have completely rebuilt it. I'm resetting the TPS sensor per the manual, but I don't have enough adjustment to get it to the proper OHMS setting. Anyone ever experience one of these sensors going bad over time? Never experienced this before and I figured I'd see if anyone has ever seen this before dropping $60 on a new sensor.
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Paw Paw 271
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Paw Paw 271 10/17/2018 10:41am
10/17/2018 10:41am
They do go bad over time. What setting are you attempting to get?

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kb228
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kb228 10/17/2018 11:05am
10/17/2018 11:05am
When The TPS on my buddies harley went bad, you couldnt set the correct voltage. Turning it had no effect on the output voltage. Maybe .02ish volts and thats it.
chuckie108
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chuckie108 10/17/2018 11:27am
10/17/2018 11:27am Edited Date/Time 10/17/2018 11:27am
Paw Paw 271 wrote:
They do go bad over time. What setting are you attempting to get?

Paw Paw
I believe the range it requires is like 570-680, and I can only get down to 940 or so. The range of adjustment it's giving me is like 940 to 1300 (approx).
Paw Paw 271
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Paw Paw 271 10/17/2018 2:40pm
10/17/2018 2:40pm Edited Date/Time 10/17/2018 2:41pm
You are looking for a range of .5-5volts. .5-.62 at idle and 5 volts at wot.

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chuckie108
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chuckie108 10/17/2018 4:25pm
10/17/2018 4:25pm
Paw Paw 271 wrote:
You are looking for a range of .5-5volts. .5-.62 at idle and 5 volts at wot.

Paw Paw
So this is something you check while it's running? Per the manual, you check resistance of the yellow/black wires.
Paw Paw 271
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Paw Paw 271 10/17/2018 5:45pm
10/17/2018 5:45pm Edited Date/Time 10/17/2018 5:47pm
It does not have to be running, but you will need to provide a power source to the tps and also read the out put. It will be unplugged so you can make a harness for this. I have found that resistance reading are not very accurate as it acts like a potentiometer. These are set using voltage pass through the same way automotive TPS units are tested and set. Remember that even if you replace it with new, it will have to set correctly to function correctly.
There are some good videos on youtube about TPS settings and testing. There have also been many threads on this site about this too.

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a22
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a22 10/25/2018 6:56am
10/25/2018 6:56am
kb228 wrote:
When The TPS on my buddies harley went bad, you couldnt set the correct voltage. Turning it had no effect on the output voltage. Maybe .02ish...
When The TPS on my buddies harley went bad, you couldnt set the correct voltage. Turning it had no effect on the output voltage. Maybe .02ish volts and thats it.
Yes- had this also on my TPS on car, it lowered abit when turning but wasn't low enough as per specs. Wasn't too far off though so I left it. May get another though.

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