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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Circuit Description

Circuit Description

An ignition voltage is supplied directly to the Evaporative Emission (EVAP) canister purge valve. The EVAP canister purge valve is Pulse Width Modulated (PWM). The scan tool displays the amount of ON time as a percentage. The Powertrain Control Module (PCM) monitors the status of the driver. The PCM controls the EVAP canister purge valve ON time by grounding the control circuit via an internal switch called a driver. If the PCM detects an incorrect voltage for the commanded state of the driver, this DTC sets.

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