H4SO (2.5L SOHC)

DTC P0140 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 2)

1. OUTLINE OF DIAGNOSIS
Detect abnormalities in the rear oxygen sensor output property.

When looking at the intake air amount, coolant temperature, main feedback control, deceleration fuel cut and other operating conditions, even though the rear oxygen sensor voltage should be moving under those conditions, if the voltage is low, this is judged as a Low side NG. If the voltage is high, it is judged as a High side NG.

When either Low side or High side is NG, judged as rear oxygen sensor property NG.

2. ENABLE CONDITION

Enable Conditions:

3. GENERAL DRIVING CYCLE
Perform the diagnosis only once after idling.

4. DIAGNOSTIC METHOD

Abnormality Judgment
When one of the following conditions is established, judged as NG.






Time Needed for Diagnosis: 200 seconds

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

Normality Judgment
When the following conditions are established, judged as OK.






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

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

7. FAIL SAFE
Sub feedback control: Not allowed.

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