P0450

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 by the vapor pressure sensor signal.

DTC Detection Condition:

DTC P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunctions.

Wiring Diagram:

Steps 1 - 3:

INSPECTION PROCEDURE

HINT:
- If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTC P0441, P0446 P0450 or P0451. If no more malfunction is detected, troubleshoot DTC P0440 next
- Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.