15
O2 Monitor Test
OBD II regulations require applicable vehicles monitor and test oxygen
(O2) sensors to determine problems related to fuel and emissions. The
O2 Monitor Test
allows retrieval of completed O2 sensors monitor
test results.
9
The
O2 Monitor Test
is not an on-demand test.
O2 sensors
are
not
tested when selected via the menu. O2 sensors are
tested when engine operating conditions are within specified
limits.
9
If the vehicle communicates using a controller area network
(CAN), O2 Monitor tests are not supported by the vehicle. A
message is displayed. See
Diagnostic Monitor Test
to see
O2 monitor data.
O2 sensors are located before (upstream) and after (downstream)
catalyst(s). Sensors are named (xy) for their position to both cylinder
banks and catalysts.
The O2 sensor for cylinder bank 1 has prefix
1
y while O2
sensor for cylinder bank 2 has prefix
2
y.
The O2 sensor upstream of catalyst (closest to engine) has
suffix x
1
while O2 sensor downstream of catalyst has suffix
x
2
. If vehicle contains more catalysts, O2 sensor downstream
of second catalyst has suffix x
3
and O2 sensor downstream
of next catalyst has suffix x
4
.
For example,
O2S21
is upstream O2 sensor for cylinder bank
2.
Diagnostic Monitor Test
The
Diagnostic Monitor Test
function is useful after servicing or after
erasing a vehicle’s memory. Test results do not necessarily indicate a
faulty component or system.
Non-CAN vehicles
Diagnostic Monitor Test
receives test results for
emission-related powertrain components and systems that are not
continuously monitored.
CAN vehicles
Diagnostic Monitor Test
receives test results for
emission-related powertrain components and systems that are and
are not continuously monitored.
Vehicle manufacturer is responsible for assigning test and component
IDs.
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