ECM set P2271 code if output signal is too high at DOWN O2 sensor when AIR-FUEL ratio is under rare condition.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
No signal activity | 1. Poor connection 2. Short to Power in signal circuit 3. HO2S(B1/S2) 4. ECM |
Enable Conditions |
•
Mass flow is higher than 20kg/h and lower than 120kg/h
•
Delta Mass Flow 2kg/h | |
Threshold Value |
•
Downstream O2S voltage is higher than 0.65V for 8sec or lower than 0.25V for 0.2sec | |
Diagnostic Time |
•
- | |
MIL ON Condition |
•
2 Driving Cycles |
