P0443: EVAP Control System Canister Purge Valve Circuit Malfunction
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0443 - EVAP CONTROL SYSTEM CANISTER PURGE VALVE CIRCUIT MALFUNCTION
| Description: | The PCM monitors the state of the 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: |
|
||
| Diagnostic Aids: | To verify normal function, monitor the EVAP canister purge valve signal PID EVAPPDC (or EVMV for electronic valve) and the signal voltage (PCM control side). With the valve closed, the EVAPPDC indicates a 0% duty cycle (0 mA for EVMV) and voltage approximately equal to battery voltage. When the valve is commanded fully open, EVAPPDC indicates 100% duty cycle (1000mA for EVMV) and a voltage drop of 3 volts minimum is normal. Output test mode may be used to switch output on/off to verify function. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| All | GO to PINPOINT TEST HX: EVAPORATIVE EMISSION (EVAP) MONITOR AND SYSTEM Step 1. | ||