P1515 Reduced Engine power??
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P1515 Reduced Engine power?? So I finished my heads cam intake exhaust project. I've been told by my tuner that the P1515 reduced engine power is coming from either the throttle body blade or the actual sensor. I have a ls2 throttle body and the ls1 to ls2 adapter from Caspers electronics. The blade on my throttle body is gold. Every time I go wide open throttle, I get the reduced engine power which I end up just deleting it on the dashboard. What could be the problem?
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From: Virginia
It really sounds like the conversion harness that you have on there is faulty. I'm not 100% sure on the LS2 throttle body voltage ranges, but it's possible that the pcm is not seeing the right amount of voltage. I am also not sure if a standard LS1 TPS would work on the LS2 throttle body. If it is the same size (many of them are) then I would ditch the conversion harness and just use the LS1 sensor.
Is the throttle body cable or wire?
Is the throttle body cable or wire?
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Joined: Oct 2014
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From: Virginia
If you have a scanner, log your voltage. If not, check it at the harness. Almost every sensor GM uses is a 0-5v setup. You should not actually see 0, or 5v on a TPS though. Again, not sure for that throttle body, but the PCM usually expects to see about .45 - 4.8v from a LS1 sensor.
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From: Virginia
Did you also have to add a pedal position sensor? Or was this car DBW stock? I can tell you LS1 Camaros at that time were all cable cars.
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Wiring can be funny sometimes. I'm not saying it's bad. I'm saying you should check into it. I do not know what the voltage range LS2 TB's put out, but I do know if that used to be a LS1 car, it's expecting to see a certain amount of voltage at "0%" (yours cannot be 0, btw) and WOT. Anything outside of that can throw a code. Being that you swapped the TB, I would look into that.
Did you also have to add a pedal position sensor? Or was this car DBW stock? I can tell you LS1 Camaros at that time were all cable cars.
Did you also have to add a pedal position sensor? Or was this car DBW stock? I can tell you LS1 Camaros at that time were all cable cars.
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From: Virginia
You can ask your tuner to check the scalar too. You can always call caspers and see what they say as well. It sounds like a voltage problem to me. And because you have a pedal position sensor, you need to check that too. Hope that helps.