The vapor pressure of a liquid is the point at which equilibrium pressure is reached, in a closed container, between molecules leaving the liquid and going into the gaseous phase and molecules leaving the gaseous phase and entering the liquid phase.n explanation of vapor pressure. Vapor pressure is constant when there is an equilibrium of water molecules moving between the liquid phase and the gaseous phase, in a closed container.
When a potential problem is detected, a dashboard warning light called a malfunction indicator light (MIL) is illuminated to alert the driver. An OBD system detects a problem well before symptoms such as poor performance, high emissions or poor fuel economy are recognized by the driver.
Wrench Warning Indicator Light: When the ignition is switched ON, the warning light is illuminated and then turns off after a few seconds. The wrench warning indicator light is illuminated when the preset maintenance period arrives. Verify the content and perform maintenance. Refer to Maintenance Monitor on page 6-20 .