I have a 2002 corvette with a swapped LS3 and a LS2 throttle body, drive by wire, that goes into limp mode after about 5 hard laps, its a dedicated track car.

I was getting codes: P1220, P1221, P1515. Car ran great up to it getting hot. Oil temps 250 and water temps 201.

But I want to run a TB test procedure on it, namely the TPS limits etc.

Does anyone have the procedure, what wires get tested etc, using a multimeter with Ohms and volts parameters? THX!

 

In the past I've had good luck by removing the TPS and cleaning the carbon off of it. If that doesn't lead to success then you might try cleaning the throttle body itself.

 

With 2 or 1 multimeters key on engine off pushing the accelerator from idle to wot watching voltages on both signal wires (connector connected) TPS#1 dark blue (with a pin or t pin in the back side of the connector) the voltage will go below 1 volt at idle to above 3.5 volts WOT. #2 wire is a pink wire, you see the voltage go from 3.8 volts at idle to 1 volt at WOT. That should give you a reference. The P1515 maybe related or the control module throttle actuator position or may just need cleaning or replaced, something to check out, might be worth checking the harness. The fact it does this warmed up makes it sound heat related, 210f is not too hot, I would check the connectors.