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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0443: Evaporative Emission Control System Purge Solenoid Valve Circuit - Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Classify Open Circuit Or Short To Ground Malfunction -  Disconnect purge solenoid valve tube that is connected to intake manifold. Connect vacuum pump to purge solenoid valve. Pump vacuum pump several times and stop. Wait a few seconds. If vacuum is not maintained, go to next step. If vacuum is maintained, go to step  5.
  4. Inspect Passage Control Of Purge Solenoid Valve -  Turn ignition off. Disconnect purge solenoid valve harness connector. Pump vacuum pump several times and wait a few seconds. If vacuum is maintained, repair or replace wire harness for short to ground. After repair, go to step  10. If vacuum is not maintained, replace purge solenoid valve. After repair, go to step  10.
  5. Inspect Purge Solenoid Valve Connector For Poor Connection -  Turn ignition off. Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.). If terminals are okay, go to next step. If malfunction is present, repair suspected terminal or replace wire harness. After repair, go to step  10.
  6. Inspect Purge Solenoid Valve -  Perform Purge Solenoid Valve Inspection. Refer to PURGE SOLENOID VALVE under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If purge solenoid valve is okay, go to next step. If purge solenoid valve is faulty, replace purge solenoid valve. After repair, go to step  10.
  7. Inspect Purge Solenoid Valve Power Supply Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage between purge solenoid valve harness connector terminal "B" (White wire) and body ground. See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White wire between purge solenoid valve harness connector terminal "B" and Main relay or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  10.
    Fig 1: Identifying Purge Solenoid Valve Circuits & Harness Connector Terminals
    G00221508Courtesy of MAZDA MOTORS CORP.
  8. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM harness connectors. Check for poor connection (damaged/pulled-out pins, corrosion, etc.). If connection is okay, go to next step. If malfunction is present, repair or replace terminal. After repair, go to step  10.
  9. Inspect Purge Solenoid Valve Control Circuit -  Turn ignition, on engine off. Measure voltage between purge solenoid valve harness connector terminal "A" (Blue/Yellow wire) and body ground. If battery voltage is present, repair short circuit in Blue/Yellow wire between purge solenoid valve harness connector terminal "A" and PCM 30-pin harness connector terminal "4U" or replace wire harness. After repair, go to next step. If battery voltage is not present, check for continuity in Blue/Yellow wire between purge solenoid valve harness connector terminal "A" and PCM 30-pin harness connector terminal "4U". If continuity is present, go to next step. If continuity is not present, repair open circuit in Blue/Yellow wire between purge solenoid valve harness connector terminal "A" and PCM 30-pin harness connector terminal "4U". After repair, go to next step.
  10. Verify Trouble Shooting Of DTC P0443 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm it up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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