I have a b20 and it is running on a vx ecu. It is currently pulling 3 codes, I know the two vtec codes are due to the wrong ecu but it is also pulling a code 7, throttle position sensor. The car runs smoothly but the engine idles around 1500 rpm. I just bought a voltmeter but am not sure exactly how to use it and what to do to check the tps. The tps appears to be undamaged and was connected correctly. Anyone have any tips to fix this? Wallace