P0443 - Evaporative Emission System Purge Control Valve Circuit

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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 shorted to GND Damaged EVAP canister purge valve EVAP canister purge valve circuit open EVAP canister purge valve circuit shorted to VPWR
Diagnostic Aids:	To verify normal function, monitor the EVAP canister purge valve signal PID EVMV and the signal voltage (PCM control side). With the valve closed (0%), the EVMV PID indicates 0 mA and voltage is approximately equal to battery voltage. When the valve is commanded fully open (100%), EVMV PID indicates 1,000 mA and a voltage drop of 3 volts minimum is normal. Output state control (OSC) may be used to switch output on/off to verify function.
Application		Key On Engine Off	Key On Engine Running	Continuous Memory
All		refer to PINPOINT TEST HX .