Additional Tests
SPECIAL TEST MENU
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In addition to retrieving Diagnostic Trouble Codes (DTCs), you can use the
scan tool to perform additional diagnostic tests, to view diagnostic and
vehicle information stored in your vehicle's on-board computer, and to
configure the scan tool for your particular needs.
SPECIAL TEST MENU
Additional tests are accessed through the “Special Test Menu.” The
following functions are available from the "Special Test Menu:"
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.
EVAP Leak Test - Performs a leak test
for the vehicle's EVAP system.
1. While linked to the vehicle, press the M
button.
The Main Menu displays.
2. Use the UP
and DOWN buttons,
as necessary, to highlight Special Test,
then press the ENTER
button.
The Special Test menu displays.
If Special Test is not shown
on the Main Menu, the Special
Test functions are not
available for your 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
identifies 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.
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