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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> 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 Intermittent Concern Or Continuous Concern -  Turn ignition off, then on (engine off). If same DTC is present, go to next step. If same DTC is not present, problem is intermittent. Refer to INTERMITTENT PROBLEM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article.
  4. 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  12.
  5. Inspect Passage Control Of Purge Solenoid Valve -  Turn ignition off. Disconnect purge solenoid valve harness connector. See Fig 1. Pump vacuum pump several times and wait a few seconds. If vacuum is maintained, repair short circuit to ground in Blue/Yellow wire between purge solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 18 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  12. If vacuum is not maintained, replace purge solenoid valve. After repair, go to step  12.
    Fig 1: Identifying Purge Solenoid Valve Circuits & Harness Connector Terminals
    G00221550Courtesy of MAZDA MOTORS CORP.
  6. 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 or replace suspected terminal. After repair, go to step  12.
  7. Inspect Purge Solenoid Valve Power Circuit For Open Circuit -  Turn ignition on, engine off. Measure voltage in White wire between purge solenoid valve harness connector terminal "A" and body ground. 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 "A" and main relay harness connector terminal "C" or replace wire harness. After repair, go to step  12.
  8. Inspect Purge Solenoid Valve Control Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage in Blue/Yellow wire between purge solenoid valve harness connector terminal "B" and body ground. See Fig 1. If voltage reading is present, repair short circuit to power in Blue/Yellow wire between purge solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 18 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  12.
  9. 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  12.
  10. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. 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 next step.
  11. Inspect Purge Solenoid Valve Control Circuit For Open Circuit -  Turn ignition off. Check for continuity in Blue/Yellow wire between purge solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 18. See Fig 1. 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 "B" and PCM 104-pin harness connector terminal No. 18 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  12. Verify Trouble Shooting Of DTC P0443 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. If same DTC is not present, go to next step. If 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.
  13. 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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