2. Late Type Description

Late Type (Intrusive) EVAP System Overview

The Late Type EVAP System, also known as the Intrusive type, was developed to meet the very stringent, mandated standard of detecting a hole 0.020 inch (0.5 mm). This system uses many of the same components as the early type EVAP system. Purge, vacuum relief, pressure relief, and ORVR operations are identical to the early type. Refer to the Applicable Vehicles chart for applicability information.

The following changes were made to the Late Type EVAP System:

^ Vapor pressure sensor connected to the fuel tank.

^ Bypass VSV in the place of the three way VSV.

^ Canister Closed Valve (CCV) on the air inlet line.





Late Type (Intrusive EVAP System) (Except ECHO)

Tank Side





The bypass VSV and the fill check valve assembly isolates the tank pressure side from the canister side (see Figure 1).

Canister Side





The bypass VSV and the Fill Check valve also isolate the canister side from the tank side (see Figure 2).