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Home >> Lexus >> 2003 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0451, DTC P0452 Or DTC P0453 >> Circuit Description
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Circuit Description

The vapor pressure sensor, the VSV for the Canister Closed Valve (CCV) and the VSV for the pressure switching valve 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 P0451, P0452 or P0453 is recorded by the ECM when the vapor pressure sensor malfunctions. See Figure. Possible causes are:

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