Equus 3130 - Scan Tool – OBD2 - Manual (Page 46)

Additional Tests
O2 SENSOR TEST
44 OBD2
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In addition to retrieving Diagnostic Trouble Code (DTC) and viewing
Live Data, you can use the Scan Tool to perform additional diagnostic
tests, and to view diagnostic and vehicle information stored in your
vehicle's on-board computer.
Additional tests are accessed through the
"Mode Selection Menu." To access the
"Mode Selection Menu", place the Scan
Tool in "Live Data" mode (see Viewing Live
Data on page 35 for details), then press
and hold the ENTER/LD button until
the "Mode Selection Menu" appears.
The following functions are available from the "Mode Selection Menu":
■ Live Data Menu - Displays the "Live Data Menu" from which you
can choose to record, customize and play back Live Data (see the
Live Data Mode section beginning on page 35 for more informa-
tion)
■ O2 Sensor Test - Retrieves and displays O2 sensor monitor test
results from your vehicle's on-board computer.
■ Non-Continuous Test - Retrieves and displays test results for
emission-related powertrain components and systems that are not
continuously monitored.
■ System Test - Performs a leak test for the vehicle's EVAP system.
■ Vehicle Information - Retrieves the vehicle's VIN number, calibra-
tion ID(s) and other related information, and lets you view a listing
of available modules for the vehicle.
O2 SENSOR TEST
OBD2 regulations require that applicable vehicles monitor and test
operation of the oxygen (O2) sensors to identify problems that can
affect fuel efficiency and vehicle emissions. These tests are performed
automatically when engine operating conditions are within predefined
limits. Results of these tests are stored in the on-board computer's
memory.
The O2 Sensor Test function lets you retrieve and view O2 sensor
monitor test results for the most recently completed tests from your
vehicle's on-board computer.
Vehicles are equipped with multiple O2 sensors. O2 sensors are
installed both upstream of (before) and downstream of (after) the
exhaust system Catalytic Converters. The name of an O2 sensor iden-
tifies its location in the exhaust system. The name of each O2 sensor
is made up of three parts:
O2S XX YY -or- O2S X Y
■ O2S -this is the basic designation for all O2 sensors.