When Monitored and Set Condition
- When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -7°C (20°F), altitude below 2590m (8500 ft). and fuel level greater than 15%.
- Set Condition: If the PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for two trips, the MIL illuminates and a trouble code is stored.
| Possible Causes |
|---|
| RESTRICTED FUEL SUPPLY LINE |
| FUEL PUMP INLET STRAINER PLUGGED |
| O2 SENSOR SIGNAL CIRCUIT |
| O2 SENSOR GROUND CIRCUIT |
| O2 SENSOR HEATER OPERATION |
| MANIFOLD ABSOLUTE PRESSURE SENSOR OPERATION |
| ENGINE COOLANT TEMPERATURE SENSOR OPERATION |
| ENGINE MECHANICAL PROBLEM |
| O2 SENSOR |
| FUEL PUMP |
| FUEL CONTAMINATION/EXHAUST LEAK |
For a complete Powertrain Control Module Circuit Diagram, (Refer to ENGINE - SCHEMATICS AND DIAGRAMS) .