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Can a Throttle Position Sensor be tested to see if it is working properly?
Yes it can but you'll need a good scan tool that can do component testing and the vehicle workshop manual or access to Alldata to know the values you should be getting from your test.
Q&A > GMC > 2002 GMC Yukon XL Denali
Q&A > GMC > 2009 GMC Yukon XL Denali
Q&A > GMC > 2003 GMC Yukon XL Denali