P0440

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 P0440 is recorded by the ECM when evaporative emissions leak from the components within the dotted line in fig. 1 below, or when the vapor pressure sensor malfunctions.





DETECTING CONDITION





WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
- If DTC P0441, P0446 or P0450 is output after DTC P0440, first troubleshoot DTC P0441, P0446 or P0450. If no malfunction is detected, troubleshoot DTC P0440 next.
- Ask customer whether, after MIL came on, customer found fuel tank cap loose and tightened it.
- Also ask customer whether fuel tank cap was loose when refueling.
- If fuel tank cap was loose, it was cause of DTC.
- If fuel tank cap was not loose or if customer was not sure if it was loose, troubleshoot according to following procedure.