P0140

DTC P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR2)

1. OUTLINE OF DIAGNOSIS
Detect the malfunction of rear oxygen sensor output property.
Judge Low side NG when the rear oxygen sensor voltage indicates low, otherwise, judge High side NG when the rear oxygen sensor voltage indicates high, in spite of the driving condition that the voltage might move,by referring to the driving condition such as amount of intake air, coolant temperature, main feedback control,fuel shut-off in deceleration, etc.
Judge rear oxygen sensor property NG when the Low side or High side becomes NG.




2. ENABLE CONDITION

3. GENERAL DRIVING CYCLE
Perform the diagnosis once after warming-up the engine.

4. DIAGNOSTIC METHOD




^ Abnormality Judgment
Judge NG when the malfunction criteria below are completed.




^ Normality Judgment
Judge OK when the malfunction criteria below are completed.

5. DTC CLEAR CONDITION
^ When the OK idling cycle was completed 40 times in a row
^ When "Clear Memory" was performed

6. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
^ When the OK driving cycle was completed 3 times in a row
^ When "Clear Memory" was performed

7. FAIL SAFE
None

8. ECM OPERATION AT DTC SETTING
^ Memorize the freeze frame data. (For test mode $02)
^ Memorize the diagnostic value and trouble standard value. (For test mode $06)