LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> 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. Inspect 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 between EVAP system leak detection pump 4-pin harness connector terminal "C" and PCM 104-pin harness connector terminal No. 6 or replace wiring harness. After repair, go to step  5.
  4. Inspect Change Over Valve (In EVAP System Leak Detection Pump) -  Perform EVAP system leak detection pump inspection. Refer to LEAK DETECTION PUMP - MAZDA6 (3.0L) under FUEL EVAPORATIVE SYSTEM - EXCEPT PROTEGE & PROTEGE5 under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If EVAP leak detection pump is okay, go to next step. If any malfunction is present, replace EVAP leak detection pump. After repair, go to next step.
  5. Verify Trouble Shooting Of DTC P0446 Is Completed -  Start engine and let it idle. Clear DTC using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off. Perform MODE 4 - EVAP SYSTEM REPAIR VERIFICATION DRIVE MODE . 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.
scientia non olet · About LEMON Manuals