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Additional OBD2 Tests<br />
O2 SENSOR TEST<br />
In addition to retrieving Diagnostic Trouble Code (DTC) and viewing<br />
Live Data, you can use the Enhanced CanOBD2&1 <strong>Scan</strong> <strong>Tool</strong> to<br />
perform additional diagnostic tests, and to view diagnostic and vehicle<br />
information stored in your vehicle's on-board computer.<br />
Additional tests are accessed through the<br />
"Mode Selection Menu." To access the<br />
"Mode Selection Menu", place the<br />
CanOBD2&1 <strong>Scan</strong> <strong>Tool</strong> in "Live Data"<br />
mode (see VIEWING LIVE DATA on page<br />
47 for details), then press and hold the<br />
ENTER/LD button until the "Mode<br />
Selection Menu" appears.<br />
The following functions are available from the "Mode Selection Menu":<br />
� Live Data Menu - Displays the "Live Data Menu" from which you<br />
can choose to record, customize and play back Live Data (see the<br />
Live Data Mode section beginning on page 47 for more information)<br />
� O2 Sensor Test - Retrieves and displays O2 sensor monitor test<br />
results from your vehicle's on-board computer.<br />
� Non-Continuous Test - Retrieves and displays test results for<br />
emission-related powertrain components and systems that are not<br />
continuously monitored.<br />
� System Test - Performs a leak test for the vehicle's EVAP system.<br />
� Vehicle ID - Retrieves the vehicle's VIN number, calibration ID(s)<br />
and other related information, and lets you view a listing of available<br />
modules for the vehicle.<br />
O2 SENSOR TEST<br />
OBD2 regulations require that applicable vehicles monitor and test<br />
operation of the oxygen (O2) sensors to identify problems that can affect<br />
fuel efficiency and vehicle emissions. These tests are performed<br />
automatically when engine operating conditions are within predefined<br />
limits. Results of these tests are stored in the on-board computer's<br />
memory.<br />
The O2 Sensor Test function lets you retrieve and view O2 sensor<br />
monitor test results for the most recently completed tests from your<br />
vehicle's on-board computer.<br />
Vehicles are equipped with multiple O2 sensors. O2 sensors are<br />
installed both upstream of (before) and downstream of (after) the<br />
exhaust system Catalytic Converters. The name of an O2 sensor<br />
identifies its location in the exhaust system. The name of each O2<br />
sensor is made up of three parts:<br />
O2S XX YY -or- O2S X Y<br />
� O2S -this is the basic designation for all O2 sensors.<br />
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