Fuel System Monitor
Operation
FUEL SYSTEM MONITOR OPERATION
| DTCs | P0171 (bank 1), P0174 (bank 2), P0172 (bank 1), P0175 (bank 2) |
| Monitor execution | Continuous |
| Sensors / components OK | MAF, TP, IAT, ECT, Barometric pressure, Back-up power, Primary / Secondary HO2S, Primary / Secondary HO2S heater |
| Monitoring Duration | Phase 1 (fuel trim limit): 43 rev., |
FUEL SYSTEM MONITOR OPERATION
| DTCs | P2096 (bank 1), P2097 (bank 2), P2098 (bank 1), P2099 (bank 2) |
| Monitor execution | Continuous |
| Sensors / components OK | ECT, MAF, TP, IAT, Barometric pressure, Back-up power, Primary / Secondary HO2S, Primary / Secondary HO2S heater |
| Monitoring Duration | Continuous |
Enable conditions
FUEL SYSTEM MONITOR ENABLE CONDITIONS
| Parameter | Minimum | Maximum |
|---|---|---|
| P0171, P0172, P0174, P0175 | ||
| Long term fuel trim mode | On | |
| Engine coolant temp. | 110 (230) °C (°F) | |
| IAT | -8 (17.6) °C (°F) | |
| Barometric pressure | 74.5 kPa | |
| Barometric pressure sensor | No DTC | |
| Fuel system | No DTC | |
| EGR system | No DTC | |
| Misfire | No DTC | |
| P2096, P2097, P2098, P2099 | ||
| Secondary O2 sensor feed back duration time | 410 sec | |
| ECT | 110 (230)°C (°F) | |
| IAT | -8 (17.6) °C (°F) | |
| Barometric pressure | 74.5 kPa | |
| Misfire | No DTC | |
| Fuel system | No DTC | |
| EGR system | No DTC | |
Typical malfunction thresholds
FUEL SYSTEM MONITOR TYPICAL MALFUNCTION THRESHOLDS
| P0171, P0174: | Long + short term ≥ 43% and (short term ≥ 20% or long term ≥ 15%) |
| P0172, P0175: | Long + short term < -30% and (short term < -11% or long term < -11%) |
| P2096, P2098: | Secondary O2S voltage average < 0.35 V |
| P2097, P2099: | Secondary O2S voltage average > 0.9 V |