DTC P0443: Evaporative Emission System Purge Control Valve Circuit

P0443 - EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE CIRCUIT

Description:	The powertrain control module (PCM) monitors the state of the evaporative emission (EVAP) canister purge valve circuit output driver. The test fails when the signal moves outside the minimum or maximum limit for the commanded state.
Possible Causes:	VPWR circuit open EVAP canister purge valve circuit short to ground Damaged EVAP canister purge valve EVAP canister purge valve circuit open EVAP canister purge valve circuit short to voltage Damaged PCM
Diagnostic Aids:	To verify normal function, monitor the EVAP canister purge valve signal PID EVMV or EVAPCP and the signal voltage (PCM control side). With the valve closed, the EVMV indicates 0 mA (0% duty cycle for EVAPCP) and voltage approximately equal to battery voltage. When the valve is commanded fully open, EVMV indicates 1,000 mA (100% duty cycle for EVAPCP) and a voltage drop of 3 volts minimum is normal.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST HX .