4 Runner 2WD L4-2693cc 2.7L DOHC MFI (1997)
Vacuum Switching Valve (VSV) for Vapor Pressure Sensor: Description and Operation
Figure 1
CIRCUIT DESCRIPTION
The vapor pressure sensor and VSV for vapor pressure sensor are used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal.
DTC P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in fig. I above, or
when there is a malfunction in either the VSV for EVAP, the VSV for vapor pressure sensor, or in the vapor pressure sensor itself.
