Equus 3040 - OBD2 ScanTool - Manual (Page 39)

Additional Functions
O2 SENSOR TEST
OBD2 37
„ Use the DOWN button to highlight
IPT, then press the LD/ENTER
button.
„ A “One moment please . . .”
message displays while the
requested information is retrieved
from the vehicle’s computer.
„ If In-use Performance Tracking is not supported by the vehicle
under test, an advisory message shows on the Scan Tool’s
display. Press the LD/ENTER
button to exit.
3.
When the retrieved process is completed,
In-use Performance Tracking statistics
for monitors supported by the vehicle
under test are shown on the Scan Tool’s
display. Use the DOWN button to view
the entire list.
4.
When you have finished viewing the statistics, press the LD/ENTER
button to exit.
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.
„ X or XX - These characters identify the location of the O2 sensor in
relation to a cylinder bank. An O2 sensor for cylinder bank 1 is
identified by the designation “1” or "B1"; a sensor for cylinder bank 2
is identified as “2” or "B2."
“Bank One” indicates the side of the engine where cylinder
number one is located (V-type engines). Bank Two is opposite
of Bank One.
„ Y or YY - These characters identity the location of the O2 sensor in
relation to the exhaust system catalyst. An O2 sensor located
upstream of the catalyst is identified by the designation”1” or "S1", a
sensor located downstream of the Catalytic Converter is identified
as “2” or "S2."