Engine Controls - Sensor Operating Range Charts: Introduction: Notes
Sensor operating range information can help determine if a sensor is out of calibration. An out-of-calibration sensor may not set a trouble code, but it may cause driveability problems. For further information on sensor testing, see TESTS W/CODES article.
NOTE:
Unless stated otherwise, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance.