DTC P0451-00: Evaporative Emission System-Pressure Sensor/Switch Range/Performance: General Description
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The Evaporative emission system (EVAP) control system pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM) increases as pressure increases. The EVAP control system pressure sensor is not used to control the engine system. It is used only for on board diagnosis.