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TPS diagnostic help

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Old 02 Mar 2012, 08:01 pm
Fresh Cruiser
Join Date: Jun 2011
Posts: 21
Default TPS diagnostic help

Hey everyone. I have an 07 limited w/automatic transmission. Lately it has been shifting rough. Changed atf and filter. Decided to check the tps and took some readings with my dmm. Here are my results: Blk/Blu = 82.3mv Red/Blu = 16.8mv Red = OL
The signal wire did not change voltage when the throttle was opened. That makes me think it's a bad sensor. But what about that OL reading. Could something from the computer be wrong if it is not getting a good 5 volt reference? Thanks!!
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Old 03 Mar 2012, 01:54 am
UptownSport's Avatar
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Join Date: Jan 2011
Location: 55403
Posts: 3,912
Default Re: TPS diagnostic help

TPS' were improved in 1997 to include an o-ring to seal it to the TB.
Previously, if you washed engine you'd have problems ...
They then got a better connector.
Thier failure rate then became about nil.

I'm not aware that they control anything on transmission-
I could certainly be wrong here-

What they do control is 'unloading', if your engine is flooded and you 'floor'
throttle it'll stop injecting excess fuel.

It may or may not have a factor in acceleration enrichment, MAP sensor is a better judge of this than the TPS.

If you have a good reason to doubt the TPS, go to Autozone or whatever, have the loan you a DRB reader, and test the range.

In direct answer to your question, I have no idea why you can't read sense voltage, but if it were absent, lots more would be wrong.
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Old 04 Mar 2012, 10:19 am
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Join Date: Jun 2011
Posts: 21
Red face Re: TPS diagnostic help

Thanks. I've ordered a new sensor. I'll let you know how it goes. And the sensor gives the computer info so it can set the shift points for your tranny, it doesn't control it.
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