Monitor Description: Notes

The EVAP monitor's purpose is to check for EVAP leaks and EVAP VSV and CCV malfunctions. The monitor performs the check by first introducing the intake manifold's negative pressure (vacuum) to the EVAP system. Then, the monitor records change in the EVAP system's pressure levels. The monitor runs when the following conditions are met:

• The engine coolant and intake air temperatures are 4 to 35°C (40 to 90°F).
• The engine is idling or the vehicle is being driven at a steady speed.
• The fuel tank pressure is stabilized.