O2S Test Result
O2S TEST RESULTa. Description of O2S TEST RESULT.
The O2S Test Result is a part of the monitoring for Heated Oxygen (HO2) sensor malfunctions. The various states (Test Items) of the HO2 sensor are monitored by the ECM. The Test Item values (Test Value) can be read using a hand-held tester or OBD II scan tool.
A Test Value is the latest snapshot data after the vehicle is driven to run the monitor. Therefore, the Test Value is not dynamic data.
If a Test Value is outside the standard range, this indicates that the HO2 sensor is malfunctioning. If a Test Value is on the borderline of the standard level, any malfunctions may be concealed in the HO2 sensor. Test Values are cleared when the ignition switch is turned to OFF.
Example
- Test ID: Code applied to each Test Item
- Test Item: State to be monitored in the test
- Description: Monitoring method
- Unit Conversion: Conversion factor used to calculate the Test Value displayed on a hand-held tester
- Unit: Unit applied to a Test Value
- Standard: The standard range or level used to judge whether or not the HO2 sensor is normal
HINT:
- Specifics of each Test Item, Description, Unit Conversion and Standard are described in the paragraph titled "O2S TEST RESULT" in each DTC section relating to the HO2 sensor, such as P0130, P0133 and P0136.
- The O2S Test Result is not applicable to the A/F (Air-Fuel Ratio) sensor and the HO2 sensor heater. The Monitor Result is used for these components tests. For more information about the tests, refer to Checking Monitor Status.
b. Procedure of O2S TEST RESULT.
CAUTION: Strictly observe posted speed limits, traffic laws, and road conditions when conducting the drive patterns.
1. Connect a hand-held tester or OBD II scan tool to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester or scan tool ON.
4. Clear DTCs (where set).
5. Drive the vehicle to run the HO2 sensor monitor, in accordance with the applicable Drive Pattern described Readiness Monitor Drive Pattern section.
6. After conducting the drive pattern, select the following menu items on the tester: DIAGNOSIS / CARB OBD II / O2S TEST RESULT.
HINT: This test is not applicable to the A/F sensor. Therefore, even when BANK 1 - SENSOR 1 or BANK 2 - SENSOR 1 is selected on the tester, "NO PARAMETER TO DISPLAY" is displayed by the tester.
7. All HO2 sensors are listed on the tester screen.
8. Select the desired HO2 sensor from the list and press the ENTER button (a screen such as that shown appears).
9. Check the Test Value (the Test Item value).
10. For the scan tool, refer to the instruction manual.
NOTE: Until the HO2 sensor monitor runs to completion, when it fails to complete or when the ignition switch is turned to OFF, the tester screen displays the upper and lower viewable limit values for the monitor (for example, voltages: 0 V and 1.275 V, seconds: 0 and 10.2, Test Value: 0 and 255).
c. Procedure of Reading Test Value (Example).
HINT: The values shown below are examples only.
1. Check the Test Value in the Test Item line.
2. Use the Unit Conversion (conversion factor value) in the O2S Test Result table to calculate the Test Value.
- Test Value: 17 x Unit Conversion: 0.3906 = Calculated Value and Unit: 6.6%
3. Check the calculated Test Value by referring to the Standard Values in the table,
HINT: If a Test Value is within the Standard Value, this indicates that the Test Item is normal. If a Test Value is on the borderline of the Standard Value, the Test Item may have a problem or malfunction.