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DTC P0443 - Evaporative (EVAP) Emission Control System Purge Valve CKT Malfunction

NOTE: PCM may stop purge operation when EVAP hoses are disconnected with engine running. This is a normal condition due to a change in purge gas concentration detected by PCM.
  1. Ensure engine is cool. Start engine and let idle. Disconnect purge hose from EVAP canister. Place finger over end of disconnected hose and ensure vacuum is not present. Reconnect purge hose. Allow engine to reach normal operating temperature. Disconnect purge hose and check for vacuum. Vacuum should now be present at purge hose. If operation is not as specified, go to next step. If operation is as specified, go to step 6).
  2. With engine running at idle, disconnect vacuum hose from EVAP canister purge valve. Ensure vacuum is present at hose. If vacuum is present, go to next step. If vacuum is not present, check for leaking, restricted, or misrouted vacuum lines. Repair as necessary. Retest system.
  3. Turn ignition off. Disconnect EVAP canister purge valve harness connector. Using an ohmmeter, measure resistance between terminals of purge valve. Resistance should be 33-39 ohms at 68°F (20°C). Resistance between each terminal and body of solenoid should be one megohm or greater. If resistance is as specified, go to next step. If resistance is not as specified, replace EVAP canister purge valve. Retest system.
  4. Disconnect vacuum hoses from solenoid. Blow into port "A". See Figure . Air should not flow through solenoid. Using fused jumper wires, connect a 12-volt battery and ground to solenoid terminals. Air should now flow through port "B". If operation is as specified, go to next step. If operation is not as specified, replace EVAP canister purge valve.
  5. Check White/Blue wire and Red/Green wire between EVAP canister purge valve and PCM for an open or short. Repair as necessary. If wires are okay, replace PCM. Retest system.
  6. Disconnect vacuum hoses from EVAP canister. Blow air into tank port of canister. Air should flow through purge port and air port with no restriction. If operation is as specified, check for an intermittent problem. See TESTS W/O CODES article. If operation is not as specified, replace EVAP canister. Retest system.
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