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Home >> Scion >> 2013 >> FR-S Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes P0300 - P050A)) >> SFI System >> DTC P0458: Evaporative Emission System Purge Control Valve Circuit Low; DTC P0459: Evaporative Emission System Purge Control Valve Circuit High [03/2012 - ] >> Monitor Description

Monitor Description

The ECM monitors the output terminal voltage when the vacuum switching valve assembly is actuated. By turning the FET in the ECM on and off, the purge valve assembly is subject to duty control. If the ECM control value (drive signal) and the output terminal voltage duty cycle continue to not match, then the ECM interprets this as a malfunction in the vacuum switching valve circuit, illuminates the MIL, and stores the DTC.

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