Monitored & Set Conditions

The EVAP monitors the system for a small leak with the ignition off, the fuel level less than 88 percent, ambient temperature between 39-109°F (4-43°C). DTC will set, due to temperature changes a vacuum is created in the fuel tank and EVAP system. With the EVAP system sealed, the PCM monitors the NVLD switch. If the NVLD switch does not close within a calibrated amount of time an error is detected.