P0450

P0450 - Evaporative Emission Control System Pressure Sensor Malfunction

CIRCUIT DESCRIPTION

Evaporative Emissions System:

DTC Detection Condition:

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 P0450 is recorded by the ECM when the vapor pressure sensor malfunction.

Wiring Diagram:

Steps 1 - 3:

INSPECTION PROCEDURE

HINT:
- If DTCs P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTCs P0441, P0446, P0450 or P0451. If no malfunction, troubleshoot DTC P0440 next.
- Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the 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.