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

Enable Conditions:

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 when the following conditions are established exceeds the predetermined time, and judge as OK if it doesn't.

Time Needed for Diagnosis
High side: 2.5 seconds
Low side 1: 20 seconds
Low side 2: 40 seconds
Low side 3: Refer to the Map.

MAP

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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)