DTC P2271: Notes
DTC P2271 DETECTION & CONDITION POSSIBLE CAUSES
| DTC P2271 |
Rear HO2S signal stuck rich |
| DETECTION CONDITION |
- The PCM monitors the input voltage from the rear HO2S when the following conditions are met. If the input voltage is more than 0.85 V
for 40 s
, the PCM determines that the rear HO2S signal remains rich.
MONITORING CONDITION
- ECT: more than 70 °C {158 °F}
- Engine speed: more than 1,500 rpm
- MAF amount: more than 10 g/s {1.32 lb/min}
- Short term fuel trim: -20-20%
- Long term fuel trim: -50-50%
- Target A/F feedback system status: feedback control
Diagnostic support note
- This is an intermittent monitor (HO2S).
- The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA is available.
- The DTC is stored in the PCM memory.
|
| POSSIBLE CAUSE |
- Leakage exhaust gas
- Rear HO2S malfunction
- Purge solenoid valve malfunction
- Fuel injector malfunction
- Leakage engine coolant
- PCM malfunction
|