Monitored & Set Conditions

System is monitored with engine running, fuel level greater than 12 percent and ambient temperature 39-89°F (4-32°C). If PCM does not see the Natural Vacuum Leak Detection (NVLD) switch close during the medium/large leak test, the PCM will increase the vacuum supply to the EVAP system by increasing the flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, DTC will set. DTC is a two trip fault. NVLD Assembly may also be referred to as a leak detection pump.