TPS not reading full range? Drivability problems?
#1
TPS not reading full range? Drivability problems?
I bought a code reader to read the codes for my CEL. The code just turned out to be for a loose gas cap One of the other functions this code reader has is it can show real time readings from some of the ECU parameters. So I was playing around with it and noticed the throttle position sensor was reading at 5.5% with my foot off the pedal. I pushed it to the floor and it only read something like 89.7% I noticed the cable was a little tight so I loosened it a smidge and adjusted the idle stop. It still only went down to 4.7% Is there something wrong with my TPS? I probed the wires a few months ago and the voltages seemed to be within the correct ranges IIRC and I couldn't find any jumps or holes in the voltage readings. I am interested in this because my car is having some intermittent bucking, missing, and power loss. I don't have a CEL or any codes stored in the ECU.
As a sidebar, I also experimented checking the TPS readings on our chevy silverado and it went perfect 0%-100%, so I don't really think there is something wrong with how the reader reads...
As a sidebar, I also experimented checking the TPS readings on our chevy silverado and it went perfect 0%-100%, so I don't really think there is something wrong with how the reader reads...
#2
Different ECUs can do different things to sensor readings, such that a code reader might show odd numbers for one car but not another. I'd probe those wires again. If you're using a good meter the voltage numbers will tell you everything you need to know.
#3
I get the exact same readings on my TPS using a Scangauge reader. My TPS is adjustable so I have tried to play with it but as I try to lower the idle setting closer to 0% then the top end reading drops lower as well. If I try to get the WOT reading closer to 100% then the idle reading goes up and the car idles too high. The PCM works off voltage readings from the TPS, not really % readings, so as long as it is getting the proper voltage range it may be fine.
#4
Did you know the ecu sees "WOT" no vacuum at MUCH less than 100% tps...
Fueling and timing is primarily based on the MAP sensor.
The tps is mainly used to determine when the car should be idling, when the fuel should be cut (when u let off gas). The low range of the tps is important, the top %s hardly matter.
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Fueling and timing is primarily based on the MAP sensor.
The tps is mainly used to determine when the car should be idling, when the fuel should be cut (when u let off gas). The low range of the tps is important, the top %s hardly matter.
Sent from my T-Mobile G2 using Tapatalk 2
#5
Did you know the ecu sees "WOT" no vacuum at MUCH less than 100% tps...
Fueling and timing is primarily based on the MAP sensor.
The tps is mainly used to determine when the car should be idling, when the fuel should be cut (when u let off gas). The low range of the tps is important, the top %s hardly matter.
Sent from my T-Mobile G2 using Tapatalk 2
Fueling and timing is primarily based on the MAP sensor.
The tps is mainly used to determine when the car should be idling, when the fuel should be cut (when u let off gas). The low range of the tps is important, the top %s hardly matter.
Sent from my T-Mobile G2 using Tapatalk 2
#6
I think your problems are elsewhere, the tps doesn't affect afr even at idle unless maybe the ecu is in limp mode. A reset should cause the stock ecu to recalibrate tps and relearn idle state.
Sent from my T-Mobile G2 using Tapatalk 2
Sent from my T-Mobile G2 using Tapatalk 2
#7
Thanks for the added info., yeah I am going to be looking at some other items that could be causing my rich issue, but the high TPS setting was causing a fast/high idle, that can't be good either way so I will try to turn it down closer to 0%.
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#8
Registered User
I get the exact same readings on my TPS using a Scangauge reader. My TPS is adjustable so I have tried to play with it but as I try to lower the idle setting closer to 0% then the top end reading drops lower as well. If I try to get the WOT reading closer to 100% then the idle reading goes up and the car idles too high. The PCM works off voltage readings from the TPS, not really % readings, so as long as it is getting the proper voltage range it may be fine.
Any downside guys?
#9
Originally Posted by JFUSION' timestamp='1356723162' post='22234299
I get the exact same readings on my TPS using a Scangauge reader. My TPS is adjustable so I have tried to play with it but as I try to lower the idle setting closer to 0% then the top end reading drops lower as well. If I try to get the WOT reading closer to 100% then the idle reading goes up and the car idles too high. The PCM works off voltage readings from the TPS, not really % readings, so as long as it is getting the proper voltage range it may be fine.
Any downside guys?