P0450
DTC P0450 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR MALFUNCTIONCIRCUIT DESCRIPTION
DTC Detecting condition:
The vapor pressure sensor, VSV for Canister Closed Valve (CCV) and VSV for pressure switching valve are used to detect abnormalities in the evaporative emission control system.
The ECM decides whether or not there is an abnormality in the evaporative emission control system by the vapor pressure sensor signal.
DTC P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunction.
Wiring Diagram:
Steps 1 - 3:
INSPECTION PROCEDURE
HINT:
- If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440 or P0442, first trouble shoot DTC P0441, P0446 P0450 or P0451. If no other malfunctions than them are detected, troubleshoot DTC P0440 or P0442 next.
- Read freeze frame data using LEXUS hand-held tester or OBD II scan tool, as freeze frame data 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.