O2S Test Result

The purpose of the O2S test result (mode 05) is to allow access to the results for on-board diagnostic monitoring tests of the heated oxygen sensor.

The O2S test result (mode 05) allows the OBD II scan tool to display the test values, minimum test limit and maximum test limit of the O2S. The test values are displayed after the vehicle has driven to run the O2S monitor.

When the test value is not between the minimum test limit and maximum test limit, the ECM (PCM) interprets this as a malfunction. When the O2S is not malfunction, if the difference of the test value and test limit is very small, the O2S will malfunction in near future.

Perform the following instruction to view the O2S status. Although this instruction references the Lexus/Toyota diagnostic tester, it can be checked using a generic OBD II scan tool. Refer to your for specific procedures.

NOTE: The A/F sensor test result is unable to be viewed using the O2S test result. Refer to the Checking Monitor Status to view the A/F sensor test result (See CHECKING MONITOR STATUS ).

PERFORM MONITOR DRIVE PATTERN
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch and the tester ON.
3. Clear the DTCs.
4. Run the vehicle in accordance with the drive pattern listed below. Do not turn the ignition switch OFF.
  NOTE: The test results will be lost if the ignition switch is turned OFF.
  
  Fig 1: Monitor Drive Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
ACCESS O2S TEST RESULT
1. Select from the intelligent tester menus: DIAGNOSIS, CARB OBD II and O2S TEST RESULTS
2. Select the desired O2S and press ENTER.
3. Select a test data and press the asterisk and HELP simultaneously to view the test value description.
NOTE: On the vehicle equipped with an A/F sensor, the tester displays "No parameter to display" if "Bank 1-Sensor 1" or Bank 2-Sensor 1" is selected.

Fig 2: O2S Test Result Display
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK O2S STATUS

Check that the Cur Val is between Min Val and Max Val.

Min Val: Minimum test limit
Max Val: Maximum test limit
Cur Val: Test value

Result:

RESULT REFERENCE

Cur Val (Test Value)	Conclusion
Between minimum and maximum values	Normal
Out of minimum and maximum values	Malfunction
Very near to minimum or maximum values	Malfunction in near future

O2S TEST RESULT INFORMATION

If you use a generic scan tool, multiply the test value by the scaling value listed below.

HO2S Bank 1 Sensor 2 and Bank 2 Sensor 2

TEST DESCRIPTION

Test ID	Description	Conversion Factor	Unit	Note
$07	Minimum O2S voltage	Multiply by 0.005	V	-
$08	Maximum O2S voltage	Multiply by 0.005	V	-
$31	Switch time from lean to rich	Multiply by 0.04	Seconds	These values are not used for malfunction judgment.
$32	Switch time from rich to lean	Multiply by 0.04	Seconds
$37	Switch time from rich to lean during fuel-cut	Multiply by 0.04	Seconds
$39	Switch time from 0.35 V to 0.2 V during fuel-cut	Multiply by 0.04	Seconds
$81	Percentage of monitoring time when O2S voltage less than 0.05 V	Multiply by 0.3906	%	-
$84	Percentage of monitoring time when O2S voltage more than 0.7 V	Multiply by 0.3906	%
$85	Maximum rich time	Multiply by 0.2621	Seconds
$87	Percentage of monitoring time when O2S voltage 0.45 V or more	Multiply by 0.3906	%