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Hello gents, I recently had the engine light come on. Checked it with my scan tool and it showed the TPS code. Reset the code an it was good for a short drive. Noticed it was shifting & idling weird looked up and saw the light was back on. It seems to happen after cruising for a few miles. Changed the sensor and all was good for a bit then crap, back on again. Is it likely that the new sensor I bought was bad? This is on a single turbo C10. The throttle body is a ported and polished unit I purchased from a member that was doing them a few years ago as an exchange. Any help is greatly appreciated, I would like to drive this truck and enjoy it.
and... STOP driving it until you get the TPS problem sorted out! You can easily FRY the transmission by trying to drive the vehicle with a faulty TPS. You say the trans is "shifting funny".. The TPS problem is why. TPS is used by the PCM to calculate and control transmission internal line pressure, and shift points. Your TPS could be causing a low line pressure issue that will KILL your trans in very short order. Imagine trying to run a 2 mile sprint, running from a rabid bear.. Now, imagine your heart rate returning to your resting heart rate (68 beats per minute or so) when the bear is right on your heels... How long will you be able to go before you black out? That's what your trans is experiencing when the TPS is giving false signals.
This is the code I get and the sensor I purchased from Orileys. I will say that when I installed the sensor in order to get the screws to line up I had to rotate it slightly. Should it slide over the shaft on the throttle body without having to turn it? What is the best way to check the voltage. My voltmeter prongs are too big to fit between the wires and the connector.
You STILL haven't mentioned the BRAND of sensor you bought. It will help if we know this.
Just realized the picture didn't load. I checked the voltage and it is,
Grey: key on 5.02v
Blue: Key on .551v
when I slowly open the throttle the blue wire climbs to 4.58 - 4.9v. I did check this after I cleared the code. Not sure if that matters.
Sometimes it's easier for a PROFESSIONAL to give you a direct answer, and not have to give you all of the background reasoning for having done so. Russ K is trying to help you out. Follow his advice, and then start doing your research as to WHY he advised you to do so. Try what he says, and then report back and let us know if your problem continues.
Sometimes it's easier for a PROFESSIONAL to give you a direct answer, and not have to give you all of the background reasoning for having done so. Russ K is trying to help you out. Follow his advice, and then start doing your research as to WHY he advised you to do so. Try what he says, and then report back and let us know if your problem continues.
just looked at my tune and I have that disabled. hell if I know why. set it to no error reported and reflash
then key on engine off and hook up the scanner and log tps volts and % . work the throttle and have a bro wiggle the harness and the grounds. if you see the volts drop out...theres your issue.
i think i remember something about there being a TPS delta that the computer didnt like to exceed in VE mode....I might be thinking of something else tho
Changed out the sensor to an AC Delco unit. Same problem. Had the wife wiggle the .... Wires and connector of course, and nothing changed. Had the Key on and scanner plugged in and nothing changed. Any ideas on what to try next. This is driving me crazy.
Did you delete the code that Russ K mentioned? Also, are you DBW... You do not mention in your original post. If you are DBW maybe the problem is not the TPS, but instead the APPS (accelerator pedal position sensor). So, are you DBW, or DBC?????? What PCM?
Did you delete the code that Russ K mentioned? Also, are you DBW... You do not mention in your original post. If you are DBW maybe the problem is not the TPS, but instead the APPS (accelerator pedal position sensor). So, are you DBW, or DBC?????? What PCM?
It is DBW and I did not delete the code. I cleared it but did not delete it. If I delete it will it affect anything else?
09-01-2018, 12:04 PM
Help Needed TPS Sensor 
