What method provides the best accuracy when performing a sweep test on a throttle position (TP) sensor?

Using a multimeter is considered the best method for performing a sweep test on a throttle position (TP) sensor due to its ability to provide precise and consistent voltage readings. A sweep test involves monitoring the output voltage of the TP sensor as it is slowly opened and closed, and accuracy in those voltage readings is crucial for evaluating the sensor's performance.

The multimeter allows the technician to measure the voltage output directly in real-time, enabling the identification of any abnormalities in the sensor's response as the throttle opens. It can reliably detect inconsistencies in voltage that may indicate a faulty sensor or issues within the sensor's range of motion.

While other tools such as a scan tool or a scope can provide useful information, they do not specifically focus on the direct measurement of voltage changes with the same level of detail as a multimeter. A scan tool might provide data related to the TP sensor but may not give the nuanced real-time voltage change data necessary for a detailed analysis. Similarly, an oscilloscope, while powerful for visualizing waveforms, may offer more information than necessary for a simple sweep test and requires additional interpretation of the data. A handheld tester could also be effective but typically lacks the precision and capability that a multimeter offers for this particular purpose.