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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0446: Change Over Valve (EVAP System Leak Detection Pump) Stuck Closed >> 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. Check EVAP System Leak Detection Pump Circuit For Short To Power -  Turn ignition on, engine off. Disconnect EVAP system leak detection pump 4-pin harness connector. Measure voltage between EVAP system leak detection pump 4-pin harness connector terminal "C" and body ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit in Orange wire betweeen EVAP system leak detection pump 4-pin harness connector terminal "C" and PCM 27-pin harness connector terminal "3V"or replace wiring harness. After repair, go to step  5.
  4. Perform Leak Inspection -  Connect all disconnected connectors and hoses. Perform Evaporative System Leak Inspection. Refer to EVAP SYSTEM TEST under FUEL EVAPORATIVE SYSTEM - EXCEPT PROTEGE & PROTEGE5 under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If test result failed (Red light comes on), leakage still exists. Locate leak point and repair. After repair, go to next step. If test result passed (Green light comes on), go to next step.
  5. Verify Trouble Shooting Of DTC P0446 Is Complete -  Start engine and let it idle. Clear DTC using WDS or equivalent. Turn ignition off. Perform MODE 4 - EVAP SYSTEM REPAIR VERIFICATION DRIVE MODE  under DRIVE CYCLES. 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.
  6. 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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