O2S Test Result
O2S TEST RESULTNOTE: The O2S Test Result is not applicable to the A/F sensor and HO2S heater. These test results are checked with the monitor status (mode 06). Refer to "Checking Monitor Status"
1. INTRODUCTION
The O2S Test Result (mode 05) allows the OBD scan tool to display the test value that was used to determine whether the Heated Oxygen Sensor (HO2S) is functioning normally or not. The HO2S condition can be checked by comparing the test value and the malfunction criterion. The O2S Test Result information is included under the "O2S TEST RESULT" in the HO2S related DTC sections. The ECM (PCM) monitors the HO2S. After the monitor, the ECM stores the test value. When the test value is outside the malfunction criterion, the HO2S functioning normally. If the test value is inside the malfunction criterion, the HO2S is malfunctioning.
2. HOW TO READ O2S TEST RESULT USING HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch and hand-held tester ON.
c. Clear the DTCs.
d. Run the vehicle in accordance with the HO2S monitor drive pattern described in READINESS MONITOR DRIVE PATTERN
e. Enter the following menus: DIAGNOSIS / ENHANCED OBDII / MONITOR INFO and MONITOR STATUS.
f. Check that the HO2S monitor status (O2S MON) is either PASS or FAIL.
g. Enter the following menus: DIAGNOSIS / CARB OBD II and O2S TEST RESULT.
h. Select the desired HO2S and press ENTER.
i. The test value appears after the component name.
HINT: If this vehicle is equipped with the A/F sensor, the hand-held tester will display "NO PARAMETER TO DISPLAY" when "BANK 1 - SENSOR 1" or "BANK 2 - SENSOR 1" is selected.
j. Some values do not have the unit. Multiply the value by the unit conversion value. For example, the test value is calculated as follows:
17 (displayed value) x 0.3906 % (unit conversion value) = 6.6 % (test value)
O2S Test Result:
k. Compare the test value and the malfunction criterion. The test value is usually significantly higher or lower than the malfunction criterion. If the test value is on the borderline of the malfunction criterion, there is a potential malfunction in the HO2S.