P0138

DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)

1. OUTLINE OF DIAGNOSIS
Detect the continuity NG of oxygen sensor. If the oxygen sensor voltage reading is not within the probable range considering the operating conditions, judge as NG.




2. COMPONENT DESCRIPTION

3. ENABLE CONDITION




Used only for malfunction judgement




Used only for normality judgement

4. GENERAL DRIVING CYCLE
After starting the engine, perform the diagnosis in series while the engine is in a constant operating condition.

5. DIAGNOSTIC METHOD







Abnormality Judgment
Judge as NG if the continuous time during which the following conditions are established exceeds the predetermined time, and judge as OK if it doesn't.

6. DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" is performed

7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" is performed

8. FAIL SAFE
Sub feedback control: Not allowed.

9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)