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O2 Monitor Test
NOTE: This is NOT an on-demand test. The O2 sensors are not tested when this
menu selection is made. The O2 sensors were tested at an earlier time when
engine operating conditions were correct.
OBD II regulations require the vehicle to monitor and test the oxygen sensors. The O2
Monitor Test selection allows the technician to retrieve the completed test information
on the oxygen sensors from the PCM. Information on the oxygen sensor monitors will
be helpful in recognizing sensor or system problems related to fuel and emissions. The
oxygen sensor test may include the following information:
To view the oxygen sensor test results, select
O2 Monitor Test from the OBD II Function
Menu and press the ENTER key.
Once the O2 Monitor Test has been selected
the recommended oxygen sensor tests list will
be displayed. Select which test you want to
review using the UP/DOWN arrow keys then
press the ENTER key.
The OBD II System Tester will display selected
information for all the vehicles oxygen sen-
sors. Listing the sensors together makes their
data easier to compare. Tests not supported
by the test vehicle will return three dashes after
the sensor name.
NOTE: If you get an Operating Error message, make sure the DLC adapter cable is
securely attached and the ignition key is ON, then try again. If the problem
remains, refer to Section 4: On-Line Help and Trouble-Shooting Tips.
NOTE: Remember that some sensors are before the catalytic converter (precatalyst)
and some are after (postcatalyst). The precatalyst and postcatalyst O2
sensors may act differently. Use the arrow keys to scroll through list if
necessary.
Press the BACK key to return to the OBD II Function Menu.
7)Playback Data
`8)O2 Monitor Test ]
9)Continuous Tests [
10)Non
-
Contin Tests|
O2 Sensor Tests
1) RICH-LN Thresh
2) LN-RICH Thresh [
`3) Lo V for Switch |
Low Volts for Switch
O2S BNK1 #1(V) 1.28
O2S BNK1 #2(V) 1.28[
O2S BNK2 #1(V) 1.28
Rich to Lean sensor threshold voltage
Lean to Rich sensor threshold voltage
Low sensor voltage for switch time
High sensor voltage for switch time
Time between sensor transitions
Rich to Lean sensor switch time
Lean to Rich sensor switch time
_ Minimum sensor voltage for test cycle
_ Maximum sensor voltage for test cycle